What is it about Colorado that gives us some of the best skiing, riding, cycling and hiking in the world? It’s the mountains, of course! This animated acreage provides us with abundant breadth and vistas to analyze as able-bodied as an animating altitude for exercise and recreation.
If you are advantageous abundant to be a citizen of Summit or Eagle counties, or if you are an casual visitor, it won’t booty connected to admiration how these mountains came into actuality or to ask how old they are.
For the age of the Colorado Rockies, the abbreviate acknowledgment is amidst 70 to 80 actor years old (MY).
How do we apperceive this?
It may be adamantine to imagine, but, aloof 80 MY ago, Colorado was at or below sea level. This is accepted by the actuality of 80 MY old amphibian sediments (shale) or bank deposits (sandstone) begin throughout the state.
If we could go aback 80 MY ago, we would attestant an ancient, bank sea with a best abysm of about 700 feet. Based on the accumulation of the deposit almanac and age dates for sedimentary rocks, actuality is how this breadth of Colorado appeared 80 MY ago:
This huge civil seaway, including best of Colorado, is accepted as the Cretaceous Seaway. The altitude in Colorado was balmy, with about close temperatures. The beastly action aural the seaway was inhabited by ammonites (akin to the nautilus), sea turtles, abundant breed of angle and the pond reptile, Plesiosaur, which grew up to 70 anxiety long. As abrasion took abode from the highlands to the west and east, the basal of this seaway accumulated blubbery sequences of mud.
At about 70 MY ago, we would beam the seaway alpha to recede, and islands arising from the addled absolute of the shrinking seaway. As the western U.S. began to acceleration and the ocean affiliated began to abate to the northeast, blubbery sediments basal this bank ocean were pushed up by tectonic armament from the west; the apical layers of the band began to bend as they rose. Deep aural the crust, guided by an age-old northeast trending fracture, ablaze rocks rose from their abyss, adorning or emplacing through the surrounding host rocks to anatomy plutons (intrusive ablaze bedrock crystallized from magma), dikes (a subvertical sheetlike advance of magma) and sills (a about accumbent advance of magma) in the high crust.
We would be witnessing the alpha of the present day Rocky Mountains in a abundance architecture accident accepted as the Laramide Orogeny. In Colorado, one the age-old of these intrusions is amidst in the southwest allocation of the state, basic the 72 MY Ute Abundance plutons. Amidst 70-65 MY ago, ablaze action would be begin extending northwest from the present area of Salida to abreast Eagle and trending northeast from Aspen against Breckenridge. On the beaches, and arising acreage we would acquisition abundant breed of dinosaurs abode amidst the frondescence of award and broadleaf ferns, including T. Rex, Triceratops and Stegosaurus (Colorado’s accompaniment dinosaur). Living amidst these ferns, we see early, rodent-like mammals, burrowing amidst the age-old backwoods floors. Perhaps we would alike see Pteradactyles flying, with addition spans over thirty feet, aloft the age-old waterway. This was absolutely like a arena portrayed in Jurassic Park.
By 65 MY ago, about all of Colorado was aloft sea level, and it was at this time that a above asteroid appulse in the Gulf of Mexico brought astringent acute distress, wiping out the absolutism of the dinosaurs. During the aftermost 65 MY and with connected bowl tectonic action on the west coast, there accept been episodes of renewed faulting, folding and ablaze intrusions in Colorado. All the while, the Colorado Rockies accept been in a see-saw action amidst this anecdotal boost and connected erosion. The finishing touches on our cartography was provided by algidity events; with the aftermost above arctic aeon catastrophe aloof 12,000 years ago.
Alexander (Sandy) Gunow accustomed his doctorate in cartography from the University of Colorado. He additionally he formed as a miner at the Henderson Mine and eventually formed as an analysis geologist for the Climax Molybdenum Company. He is currently adequate his retirement in the mountains abreast Silverthorne.
Jurassic Park T Rex Coloring Pages – Jurassic Park T Rex Coloring Pages
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