The Jura Mountains

While Switzerland is famous for its Alps, which comprehend the southern one-half of the country, it too harbors a bit mount range, the Juras, which stretch along its northwestern edge amongst France.  More than 200 miles inwards length, the Jura Mountain Range arcs from the Rhone Valley, at Geneva, to the Rhine Valley, at Basel.

The Jura Mountains convey a nub as well as outcrops of marine Jurassic limestone, deposited inwards the Paratethys Sea when dinosaurs roamed the planet; these sedimentary rocks were uplifted during the Pliocene Period of the Cenozoic Era (some 5-2 ane 1000 k years ago) equally trace per unit of measurement area from the ongoing Alps Orogeny rippled the landscape to their north.  While Jura way forested or mountains inwards regional native languages, it is too the reason for the word Jurassic, a refer chosen past times geologists for the oculus flow of the Mesozoic Era.  The Jura mountains are indeed forested except for alpine grasslands on the higher summits as well as sheer stone cliffs on simply about of the mount flanks; the highest peaks of the Juras are inwards the southwestern constituent of the gain but all are nether 5700 feet inwards elevation.

While villages abound inwards the valleys, the rugged slopes of the Jura Mountains convey express development.  Ski resorts convey been constructed inwards recent decades as well as both countries convey established Nature Reserves along the range.  Of course, the limestone geology has too produced a wealth of karst features (caves, springs, hugger-mugger streams) which attract visitors to the Juras.

Lac Leman

During our commencement calendar week inwards Switzerland, my married adult woman in addition to I volition move staying inwards Nyon, on the northward shore of Lac Leman, to a greater extent than usually known equally Lake Geneva throughout the English-speaking world.  Created past times glacial erosion during the final glaciation of the Pleistocene, this crescent shaped lake is ane of the largest inwards western Europe, 45 miles inwards length in addition to upwards to viii miles wide.

Near Nyon, the deeper Grand Lac share (to the due east in addition to southeast) gives agency to the Petit Lac, a shallower in addition to narrower department that extends westward to Geneva.  This latter share of Lac Leman was subjected to the series deposition of terminal moraines equally the glacier melted dorsum toward the Alps also equally sedimentation from glacial streams that entered from its northward in addition to south.  The Rhone River, directly rise from its residue mount glacier inwards the Alps, flows through Lac Leman in addition to and thus drains it through southern French Republic earlier entering the Mediterranean Sea.

This afternoon, nosotros enjoyed a spectacular sentiment of Lac Leman from the metropolis of Nyon.  Backed past times the Alps, the lake shimmered inwards the belatedly jump sunshine in addition to was studded alongside numerous sailboats.  Once threatened past times pollution, the lake has since recovered in addition to remains the natural gem of western Switzerland, sandwiched betwixt the Alps, to its south, in addition to the Jura Mountains to its north.

Guatemala's Volcanic Eruption

The eruption of a volcano inwards Republic of Guatemala as well as its tragic consequences accept drawn attending across the globe this week.  Some volition blame the lawsuit on the random violence of nature piece others volition come across the manus of God inwards the devastation as well as suffering.  But if y'all must bill mortal or something, blame the Atlantic Ocean.

During the Permian Period, simply about 250 1000000 years agone (MYA), the Continents had merged to degree Pangea.  By the Triassic, nearly 200 MYA, the Tethys Sea opened, separating Laurasia (the northern Continents) from Gondwanaland (the southern Continents).  Then, during the Jurassic Period (some 150 MYA), the Atlantic began to opened upward as well as the American Continents were pushed westward, a procedure that continues today.  In concert, the oceanic Farallon Plate was forced to subduct beneath the advancing Continental Plates; today, the Juan de Fuca Plate (in the Pacific Northwest), the Cocos Plate (west of United Mexican United States of America as well as Central America) as well as the Nazca Plate (west of South America) are the main remnants of the Farallon Plate as well as all decease along to subduct beneath the American Plates.

As these oceanic plates subduct, their leading border melts when it approaches the Earth's mantle, triggering the formation of volcanoes (the Cascades, the western mountains of United Mexican United States of America as well as Central America, as well as the Andes); earthquakes as well as tsunamis equally good outcome from this tectonic activity.  The electrical current eruption inwards Guatemala, releasing volcanic ash, pyroclastic flows as well as lahars, is thence a secondary effect of the Atlantic's expansion.  populace did non halt evolving when nosotros humans appeared!

The Smoky Hills Of Kansas

Yesterday, equally I flew from Missouri to Colorado, our road took us across the key latitudes of Kansas.  The depression forenoon Sun angle in addition to clear skies provided ideal weather condition for observing the topography below in addition to I got a practiced await at the Smoky Hills.

The Smoky Hills Province of the Great Plains stretches across north-central Kansas in addition to into south-central Nebraska.  It is characterized past times depression hills that convey been sculpted from Cretaceous bedrock past times the tributaries of the Smoky Hill, Saline, Solomon in addition to Republican Rivers (south to north).  That bedrock, deposited inside in addition to along a Cretaceous Sea that i time covered nearly of the Great Plains region, is comprised of iii bands: Dakota Sandstone, Greenhorn Limestone in addition to Niobrara Chalk (east to west).

Those who motility across Kansas on Interstate 70, cross the southern constituent of the Smoky Hills Province betwixt Salina in addition to Hays; there, simply about ridges of the Province are adorned amongst turbines of the massive Smoky Hills Wind Farm.  The High Plains border the Smoky Hills to the due west piece the Permian swath of the Flint Hills stretches due north to S to their east; the Smoky Hill River Valley demarcates the southern border of the Province.

Crossing The Eastern Divide

Yesterday morning, nosotros left Knoxville, driving eastward through the foggy Tennessee Valley.  After crossing the Holston in addition to French Broad Rivers (which bring together to degree the Tennessee), nosotros climbed into the Blue Ridge Mountains, next the course of written report of the Pigeon River.  Leveling out W of Asheville, nosotros crossed the dissever betwixt the Pigeon in addition to the French Broad Rivers, encountering the largest concentration of tent caterpillars that I convey e'er seen.

At Asheville, nosotros angled southward on Interstate 26 in addition to crossed the Eastern Divide but southward of Hendersonville; this Divide, which snakes due north to southward through Eastern Canada in addition to the Eastern U.S., separates the watersheds of rivers flowing to the Gulf of United Mexican States from those flowing toward the Atlantic Ocean.  South of the Divide, nosotros shortly arrived at the border of the Blue Ridge Mountains in addition to were treated to a spectacular persuasion of the Southeastern Piedmont.

After undulating across the Piedmont, hemmed inwards past times a pine-broadleaf forest, nosotros crossed the Fall Line at Columbia, leaving the Precambrian bedrock of the Blue Ridge in addition to Piedmont in addition to traveling across the flat, sandy reason of the Coastal Plain.  We'll pass a few days along the South Carolina coast earlier heading southward to Florida.

White Beaches Of Northwest Florida

The Florida Panhandle is known for its sparkling white beaches, a trait that results from their composition.  The "sugar sand" of this percentage is composed of fine, ovoid quartz crystals, eroded from the Blue Ridge Mountains as well as deposited inwards the Gulf of United Mexican U.S.A. past times the Apalachicola River.

Spread past times currents inside the Gulf, the quartz crystals are a main ingredient of beaches all along the Florida Gulf Coast only are to the lowest degree "contaminated" amongst crunch fragments along the Panhandle.  In beaches along the Florida Peninsula as well as Keys, variable amounts as well as coloring of crunch fragments modify the appearance of the sand; inwards around areas, the crunch fragments predominate as well as the beach is gray, tan or nearly black.

Here on Pensacola Beach, the white sand is dazzling inwards the brilliant afternoon sun, squeaking beneath your feet as well as producing a precipitous contrast amongst the clear, turquoise H2O of the Gulf.  As 1 powerfulness hold off from the to a higher house discussion, shells are small, generally white as well as far less abundant than on the beaches of Southwest Florida.

Mystery Seismic Sea Wave Inward Indonesia

Yesterday, next 2 earthquakes (the minute a magnitude 7.5 quake) as well as a serial of aftershocks off the due west coast of Sulawesi Island, a seismic sea wave struck Palu, at the terminate of a long, narrow bay.  Both the Island as well as the side past times side Makasser Strait prevarication squarely on a southern extension of the Eurasian Plate, which encompasses all of Indonesia.

Destructive tsunami's are mostly triggered by Subduction Earthquakes, where 1 tectonic plate dips beneath another; such a subduction zone stretches along the outer edge of Indonesia, where the Australian as well as Philippine Plates are subducting beneath the Eurasian Plate.  Yesterday's serial of quakes as well as aftershocks are idea to bring developed along a transverse fault, where 2 microplates (of the Eurasian Plate) are scraping past times 1 another; such faults arrive at non mostly arrive at vertical elevator of the overlying sea, the tectonic procedure that commonly generates tsunamis.

Geologists suspect that closed to vertical crusade of 1 of the microplates may bring occurred as well as that the topography of the narrow bay probable amplified the moving ridge that was produced.  Regardless of the geologic explanation, the seismic sea wave struck Palu as well as killed at to the lowest degree 384 residents as well as visitors.

Update:  As of 10-3-18, to a greater extent than than 1400 bodies bring been recovered as well as the decease terms is expected to rise.  

Table Mountain, S Africa

Watching a cinema ready inwards Cape Town, South Africa, today, I wondered nearly the geology of Table Mountain, which looms inwards a higher house the city.  As is frequently the case, the natural history of that famous massif is complex.

About 500 meg years ago, during the Cambrian Period, a rift valley developed inwards the southern part of a continental plate that included today's Continents of South America, Antarctica in addition to Africa.  Initially flooded past times a shallow sea, the rift accumulated sediments over the side past times side 100 meg years.  Throughout the belatedly Paleozoic in addition to early on Mesozoic Eras, this part was folded, lifted in addition to eroded past times tectonic forces every bit Earth's Continents merged into Pangea in addition to and then rifted apart.

Among the sedimentary rocks that formed inside the ancient rift valley was a thick layer of difficult quartzite sandstone; resistant to erosion, this Table Mountain Sandstone straight off outcrops every bit the steep cliffs of Table Mountain in addition to the Cape Fold Ranges of western South Africa.  Of note, the western terminate of this sandstone formation is straight off institute inwards Argentina, separated from its South African segment every bit the Atlantic Ocean opened, simply about 150 meg years ago.

Edge Of The Colina Country

The Hill Country, inwards fundamental Texas, is primarily the production of marine Cretaceous limestone that was deposited inwards a shallow body of body of water closed to 100 1000000 years ago; afterward lifted equally a plateau, it has since been sculpted into hills past times numerous streams; inwards closed to regions, granite domes ascension inwards a higher house the limestone, likewise lifted past times tectonic forces.  The widespread limestone bedrock has produced a karst landscape, characterized past times numerous caves, springs, sinkholes in addition to secret streams.

The eastern border of the Texas Hill Country cuts across western Austin, offering broad views of the Metroplex from higher terrain.  Representing the easternmost segment of the Desert Southwest, the semiarid hills are covered past times yucca in addition to prickly-pear studded grasslands in addition to past times woodlands of juniper in addition to oak.  Wildlife includes white-tailed deer, coyotes, fox, bobcats, armadillos, roadrunners, a host of raptors in addition to a broad diversity of songbirds.

On this cloudy, mild forenoon inwards Austin, my married adult woman in addition to I visited 2 sites along the border of the Texas Hill Country.  The starting fourth dimension was Mount Bonnell, peradventure Austin's close pop overlook, alongside rises inwards a higher house the due north banking concern of the Colorado River, northwest of the city.  After taking inwards the views from that limestone ridge, nosotros enjoyed a two-mile hike through the Wild Basin Wilderness Preserve, on the due east side of Route 360, which protects a segment of the Hill Country ecosystem from the relentless encroachment of suburban development.   

Mckinney Falls Solid Lay Down Park

Before heading to the Austin drome yesterday, I visited McKinney Falls State Park inwards the southeastern quadrant of the city.  There, Onion Creek has sliced a channel through the Cretaceous limestone that underlies the region, exposing wide expanses of that bedrock too dropping over ii scenic waterfalls (the Upper too Lower McKinney Falls).

Rising close Johnson City, Texas, due west of Austin, Onion Creek winds through the Hill Country earlier snaking across southern Austin; most eighty miles from its origin, the creek enters the Colorado River eastward of the Austin-Bergstrom International Airport.

As i mightiness expect, the State Park was crowded alongside tourists too local visitors on a warm Dominicus afternoon.  While other hordes were visiting the South X Southwest festivities downtown, nature is a strong competition for human attending too this Park harbors roughly of the most scenic landscape inwards Metro Austin.

In Driftless Terrain

As I described inwards The Wisconsin Ozarks, an expanse of the Upper Midwest was sparred the effects of the final Pleistocene glaciation.  This Plateau of early on Precambrian limestones in addition to dolomites (known every bit the Driftless Area) extends from cardinal Wisconsin into southeastern Minnesota, northeastern Iowa in addition to extreme northwestern Illinois. Galena in addition to its surroundings prevarication inside that geologic zone, where the topography is characterized past times knobs, hills in addition to ridges, carved from the plateau past times glacial meltwater in addition to numerous post-glacial streams.

This morning, afterward breakfast inwards historic downtown Galena, nosotros headed to Horseshoe Mound Preserve, only southeast of town.  From that pinnacle, i enjoys a panorama of northwestern Illinois, extending to southern Wisconsin in addition to across the Mississippi River Valley to Iowa.  Our adjacent halt was a flake further south, where the Casper Bluff Land in addition to Water Reserve, stretches to a higher house the eastward banking concern of the Upper Mississippi; covered past times restored prairie, oak savanna in addition to riparian woodlands, it besides harbors ceremonial mounds from the Late Woodland Period (700-1000 AD), including a thunderbird effigy mound.

Our 3rd hike of the morning time was at Galena's Gateway Park, withal nether development; roughly of the trails through this hilly, abandoned farmland were non well-maintained in addition to the walk seemed much longer than it genuinely was. On the other hand, it was a peachy expanse for birding in addition to rose-breasted grosbeaks were specially common.  Following that rather strenuous trek nosotros rewarded ourselves amongst a take in to a winery northeast of Galena; in that place nosotros indulged inwards i of its products on a shaded veranda, enjoying a pleasant persuasion of the driftless terrain.

Southwest To The Iv Corners

Looking ahead to several days alongside no commitments, I stimulate got decided on a route trip to the Four Corners region, where U.S.A. of Colorado, New Mexico, Arizona in addition to Utah meet.  Though I stimulate got been to that expanse inward the past, at that spot are several routes through its varied landscape that volition give me a novel perspective on the terrain in addition to topography.  Now that nosotros stimulate got entered the summertime tourist season, I volition skip Mesa Verde National Park which I had the pleasance to watch nearly 30 years ago.

Geologically, the Four Corners is a state of volcanic features, superimposed on uplifted in addition to eroded slow Paleozoic in addition to Mesozoic sediments.  Tributaries of the Colorado River drain the landscape; the San Juan rises from numerous rivers in addition to creeks along the due south flank of the the San Juan Mountains in addition to therefore heads westward to bring together the Colorado inward Lake Powell piece the Dolores River drains the due west flank of both the San Juans in addition to the Uncompahgre Plateau every bit it flows NNW to merge alongside the Colorado northeast of Moab, Utah.  Other prominent natural features include Ship Rock (a remnant volcanic neck), Sleeping Ute Mountain, the  La Sal Range (east of Moab) in addition to the Chuska Mountains (on the New Mexico-Arizona line).

Planning to larn out Denver early on tomorrow morning, I volition follow States 285 southwest, crossing Kenosha Pass to drib into South Park.  From there, the highway crosses Trout Creek Pass to come inward the Upper Arkansas River Valley in addition to therefore turns southward, climbing over Poncha Pass to accomplish the wide San Luis Valley.  Within that valley I volition switch to States 160, heading due west in addition to therefore southwest, climbing along the South Fork of the Rio Grande River to Wolf Creek Pass.  Beyond that pass, a long descent volition accept me through Pagosa Springs in addition to into Durango, where I volition probable pass the kickoff night.  More details inward coming posts.

See also: San Juan Volcanism

The Ridgecrest Earthquakes

The recent earthquakes around Ridgecrest, California, were odd inwards a span of ways.  The first, on July 4, was a 6.4 magnitude quake, piece the second, a 24-hour interval later, was a 7.1 magnitude quake, roughly eleven times to a greater extent than powerful.  The initial earthquake has hence been categorized equally a pre-shock, having occurred earlier a stronger 1 though both bring been followed past times numerous aftershocks; the showtime quake was centered 6.6 miles below the surface of the desert piece the minute was four miles deeper.

Well northeast of the San Andreas Fault, these rigid earthquakes developed on ii perpendicular error lines that stretch beneath the Mojave Desert at the S halt of the Owens Valley.  The latter runs NNW to SSE between the Sierra Batholith as well as the fault-block White Mountains Range of the western Great Basin; both of these ranges perish on to ascent as well as the crust of the Great Basin is nether increasing tension (pulled apart inwards a West-East direction).

These earthquakes demonstrate the complexity of error lines inwards Southern California, many of which are non completely mapped.  While the earthquakes occurred far from the San Andreas Fault (which volition eventually deliver "The Big One") their occurrence may reverberate increasing push clit per unit of measurement area inside the latter Fault as well as their crustal movements may trigger additional earthquakes equally push clit per unit of measurement area is transferred to other error lines that crisscross the region.

See also: The Nature of Aftershocks and Earthquakes & Tectonic Plates

Curt Gowdy Blue Planet Park

Curt Gowdy State Park, named for the sportscaster too native of Wyoming, stretches across the eastern flank of the Laramie Mountains, westward of Cheyenne.  The Laramies are a wide uplift of Precambrian granite stretching from northern Colorado (NNW of Ft. Collins) to Casper, Wyoming, too bisected past times the Laramie River.  The Park is best reached via Route 210, which leads due north from Interstate fourscore close the acme of the ridge too before long curves eastward through scenic terrain.

Deciding to escape the oestrus moving ridge inward Metro Denver, my married adult woman too I drove upwards to Laramie today too and thence out to Curt Gowdy State Park.  Characterized past times 3 reservoirs, rolling hills adorned amongst ponderosa pino parklands, scenic outcrops of granite and, inward shaded canyons, pine-fir forest, the 3500 acre Park is pop for camping, hiking too fishing.  After stopping past times the Visitor Center, nosotros laid upwards off on the Crow Creek Trail, which leads upward through a beautiful canyon to Hidden Falls (4 miles roundtrip).  It is clearly the virtually pop hike at the Park precisely was non uncomfortably congested on this Tuesday afternoon; other than humans, nosotros encountered mule deer, golden-mantled Earth squirrels, cerise squirrels too a host of "Montane" songbirds.

In no hurry to supply to 100 score F temperatures along the Colorado Front Range, nosotros bring decided to take in Devils Tower tomorrow, a spectacular National Monument inward northeast Wyoming that nosotros bring non nevertheless had the pleasance to "closely encounter."  Details on that sense inward the side past times side post.

Journey To Devils Tower

Leaving Laramie, Wyoming, this morning, nosotros headed E on Interstate 80, climbing into the Laramie Mountains.  Beyond the pass, nosotros began a long descent on The Gangplank too thence switched to I-25 North at Cheyenne.  This highway parallels the Laramie Range, initially at a distance too thence at closed hit most Wheatland, where Laramie Peak (10,500 feet) looms to the northwest too where the Interstate crosses the Laramie River.

Farther north, afterwards passing the Glendo Reservoir too crossing the North Platte River, nosotros headed E on US xviii to Lusk, crossing nondescript grasslands along the way.  At Lusk, nosotros turned northward on US 85, shortly driving through a scenic landscape of hills too mesas too crossing the upper Cheyenne River.  Nearing Newcastle, yellow sweetness clover blanketed the hills too valleys too bee-hive boxes were spaced along the highway; northward of Newcastle, US 85 undulates through the westward border of the Black Hills, where Paleozoic redbeds adorn the scenery.  At Four Corners, nosotros cutting northwest on Route 585 to Sundance too thence followed Routes xiv too 24 northward to Devils Tower, America's commencement National Monument (established past times Theodore Roosevelt inwards 1906).

The geology too natural history of Devils Tower is described inwards an before postal service (see link) too I volition non repeat myself inwards this one.  On this mild twenty-four hours inwards mid July, nosotros were greeted past times throngs of immature human being tourists too past times an approaching summertime thunderstorm.  Though nosotros did motility into the Monument too joined a parade of humans on the Tower Trail that circles the famous landmark, Devils Tower is best appreciated at a distance, where 1 tin give the sack notice its placement inwards the landscape too persuasion its grandeur inwards relative solitude.

Northwest To Ketchikan

Escaping the latest oestrus moving ridge along the Colorado Front Range, my married adult woman in addition to I volition endure visiting friends inwards Ketchikan, Alaska, over the adjacent several days.  There nosotros volition taste afternoon highs inwards the 60s (F) in addition to overnight lows inwards the 50s; of course, pelting showers are equally good inwards the forecast, equally i mightiness await inwards Southeast Alaska.

As I discussed in Alaska's Collage of Terranes, nearly of the State is a mosaic of exotic terranes in addition to volcanic isle arcs, subsequently molded yesteryear glaciers, earthquakes, volcanic eruptions, torrents of meltwater in addition to fluctuating body of body of water levels.  Ketchikan sits inwards the Gravina Belt, composed of mid Jurassic to early on Cenozoic volcanic rocks, sandwiched betwixt the Alexander Terrane, to the west, in addition to the Stikine Terrane, to the east.  The Alexander Terrane is particularly interesting; its Silurian in addition to Devonian strata in addition to their cargo of fossils signal that it was torn away from Siberia equally the Northern Pacific opened.  The Stikine Terrane, on the other hand, formed equally a volcanic isle arc from the belatedly Paleozoic Era into the early on Mesozoic.

Today, Ketchikan, sitting on the Inside Passage, is a cruise send port during the summertime months.  Having express fourth dimension for our journey, nosotros volition endure flight from Denver (with a plane alter inwards Seattle).  More on our endangerment inwards upcoming posts.

Above The Cascades & Corking Basin

Flying dorsum to Denver, yesterday, nosotros changed planes inwards Seattle.  On that 2d flight, nosotros took off to the south, before long passing the massive mass of Mt. Ranier, to our east.  Curving southeastward, nosotros together with therefore caught sight of the remnant cone of Mt. St. Helens to our southwest and, inside a few minutes, flew over the snowy crest of Mt. Adams.  Next came the distinctive split of Mt. Hood, across the Columbia River Valley, together with other prominent summits further south; unfortunately, haze obscured the distant horizon together with I was unable to locate Mt. Shasta, inwards Northern California.

Having formed over the yesteryear 36 1 one m thousand years, equally the Farallon together with its remnant Juan de Fuca Plate convey been subducting beneath the North American Plate, the Cascades stretch from west-central Washington to Northern California together with leave of absence on to split today.  Indeed, many Cascade volcanoes convey developed together with eroded (or exploded) away during that fourth dimension together with the prominent volcanic peaks mentioned higher upwardly are less than two 1 one m thousand years old; the eruption of Mt. St. Helens, inwards 1980, was a clear indication that the attain is withal evolving.

East of the Cascades, is the high, dry out desert of the Great Basin, stretching from eastern Oregon together with California across Nevada, southernmost Idaho together with western Utah.  Fault-block ranges, running due north to south, are separated yesteryear wide valleys which harbor sage grasslands, seasonal rivers, sinks, ephemeral lakes together with a few large saline lakes. Unfortunately, clouds obscured the mountains of Utah together with Colorado until nosotros crossed the Front Range higher upwardly Rocky Mountain National Park together with descended into Metro Denver.

Flashback Postal Service Xvi

In recent days, the Bahama Islands bring been inwards the intelligence every 2d they bring endured the wrath of Hurricane Dorian.  A review of their natural history thence seems appropriate, the champaign of written report of a post service dorsum inwards September, 2009.

See: Natural History of the Bahamas

The Lilliputian Missouri Badlands

Rising inwards extreme northeast Wyoming, near Devils Tower, the Little Missouri River flows northeastward across southeast Montana too the western Dakotas (paralleling the Yellowstone River for virtually of its route) earlier entering the Missouri River inside Lake Sakakawea.  Like other rivers of the Missouri Plateau, it cuts through soft (relatively young) Tertiary sediments to arrive at badlands inside the surrounding prairie.

In the North Dakota department of its watershed, Theodore Roosevelt National Park protects several areas of those badlands, commemorating Roosevelt's conservation achievements too enveloping the site of his Elkhorn Ranch, which he established inwards the 1880s; the Park, itself, was ready aside inwards 1947.  The colorful too ever-changing cliffs, domes, mesas too buttes of the badlands are adorned amongst stands of juniper, spell wetlands, meadows too groves of cottonwood comprehend the valley floors.  Bison, elk, bighorn sheep too pronghorn, ane time extirpated yesteryear overhunting, convey all been reintroduced too both mule too white-tailed deer inhabit the Little Missouri Valley.

Father of the U.S.A. Forest Service, Theodore Roosevelt created 5 National Parks, fifteen National Monuments too 150 National Forests during his Presidency.  Contrast those achievements amongst the negative environmental impacts of the Trump Administration!

Geologic History Of Scotland

In the slow Precambrian Era in addition to into the Cambrian Period, the basement stone of Scotland was purpose of proto-North America, having accreted to that Continent equally a serial of exotic terranes.  The Iapetus Ocean separated this continental volume from that of England in addition to Western Europe.

Then, virtually 450 1 one 1000 thousand years agone (MYA), the Iapetus Ocean unopen in addition to the 2 continents collided, triggering the Caledonian Orogeny; much later, virtually 150 MYA, the Atlantic Ocean opened in addition to Scotland remained amongst Europe.  Today, ancient rocks that preceded the Caledonian Orogeny underlie most of Scotland simply surface primarily across the Western Islands in addition to the Highlands; the latter share is divided into the Northwest Highlands in addition to the Grampian Mountains past times the Great Glen Fault.  As these Highlands crumpled upward, volcanism, erosion in addition to displacement of emplaced metamorphic crust produced the complicated geology of that region.  South of the Highlands Boundary Fault, the Central Lowlands stand upwards for a Rift Valley, characterized past times Paleozoic sediments, volcanic intrusions in addition to to a greater extent than recent glacial deposits.  Finally, the Southern Uplands, bordering England, are comprised of uplifted in addition to eroded Silurian crust from the Iapetus Ocean.

Acting on this underlying mosaic of Precambrian in addition to Paleozoic bedrock, the Pleistocene Glaciers (1.8 1 one 1000 thousand to 10 one 1000 years ago) plowed downward the higher peaks, gouged out canyons in addition to valleys in addition to and hence left behind layers of till equally they receded northward.  In addition, their meltwaters scoured the terrain in addition to rising seas drowned the coastline, separating the western in addition to northern islands from the Scottish mainland.