Morrison in Jefferson County, Colorado — The American Mountains (Southwest)
Front Range Foothills
The rock on which you stand, and in which the Red Rocks Theater is carved, belong to the Fountain Formation. In places, these rocks contain fossil remains of tiny animals that lived in the sea about 300 million years ago (fossil 1).
Alon the highway that crosses the ridge in front of you there are maroon and gray shales
The ridge, known as the Dakota Hogback, is composed of hard Dakota sandstone, which lies above the Morrison Formation. The Dakota sandstone contains fossil clams (fossil 3) and is a valuable source of artesian water and of oil in the plains region east of the hogback. Afew miles south of here it contains uranium.
Mount Carbon, farther east, has seams of coal but consists mainly of clay used for bricks. It also contains fossil seashells and dinosaur bones about 100 million years old (fossils 4 and 5).
After these deposits were laid down, volcanic debris, partly preserved at Green Mountain, was deposited by streams.
Gravel along the creeks was washed down during the ice age only a few thousand years ago, when mammoths (fossil 6) roamed the Denver Plains.
Erected 1962 by Colorado Scientific Society and the Rocky Mountain Association of Geologists.
Topics. This historical marker is listed in these topic lists: Natural Features • Paleontology.
Location. 39° 40.331′ N, 105° 12.225′ W. Marker is in Morrison, Colorado, in Jefferson CountyTouch for map. Marker is in this post office area: Morrison CO 80465, United States of America. Touch for directions.
Other nearby markers. At least 8 other markers are within walking distance of this marker. Red Rocks Amphitheatre (approx. half a mile away); Red Rocks Park (approx. 0.6 miles away); Cretaceous Time (approx. 0.6 miles away); The Rocky Mountains (approx. 0.6 miles away); Brontosaur Bulges (approx. 0.6 miles away); Rock Deformation (approx. 0.6 miles away); Volcanic Ash (approx. 0.6 miles away); West Alameda Parkway / Dinosaur Ridge (approx. 0.6 miles away).
Also see . . . Front Range. Wikipedia entry. (Submitted on September 13, 2020, by Larry Gertner of New York, New York.)
Credits. This page was last revised on September 13, 2020. It was originally submitted on July 28, 2012, by Kevin W. of Stafford, Virginia. This page has been viewed 642 times since then and 9 times this year. Photos: 1, 2, 3. submitted on July 29, 2012, by Kevin W. of Stafford, Virginia.
Editor’s want-list for this marker. Wide area picture of the marker and its surroundings. • Can you help?