Golden in Jefferson County, Colorado — The American Mountains (Southwest)

Late Jurassic Time

Photographed By Jackson Perrie, August 25, 2018

1. Late Jurassic Time Marker

Inscription. Click to hear the inscription.

This is part of the Morrison Formation accumulated around 150 million years ago. Monsoonal (seasonal) rains caused flooding which dotted the terrain with small lakes, ponds, and braided streams. These served as watering holes in the drier times. This part of Colorado may have had a climate much like that of the savannah in Africa today.

This present day map shows the wide distribution of the Morrison Formation in North America. Many of the major Late Jurassic dinosaur quarries are in Colorado, Wyoming, and Utah, as the key shows below.

Topics. This historical marker is listed in these topic lists: Environment • Natural Features.

Location. 39° 40.714′ N, 105° 11.715′ W. Marker is in Golden, Colorado, in Jefferson County. The marker is on the Dinosaur Ridge Trail which is a 1.1 mile wide paved section of West Alameda Parkway that is closed to traffic. This marker is found 250 yards southeast of the parking area located at the junction of 93 (Hog Back Road) & West Alameda Parkway. This Trail has 15 unique dinosaur

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and geologic features. Touch for map. Marker is in this post office area: Golden CO 80401, United States of America. Touch for directions.

Other nearby markers. At least 8 other markers are within walking distance of this marker. Morrison Fossil Area (a few steps from this marker); Rock Deformation (within shouting distance of this marker); Theropod Track (within shouting distance of this marker); Brontosaur Bulges (within shouting distance of this marker); The Rocky Mountains (about 300 feet away, measured in a direct line); Volcanic Ash (about 400 feet away); Bone Deposition (about 500 feet away); West Alameda Parkway / Dinosaur Ridge (about 500 feet away). Touch for a list and map of all markers in Golden.

Also see . . .
1. Morrison Formation. (Submitted on October 19, 2018, by Alan M. Perrie of Unionville, Connecticut.)
2. Jurassic Time. (Submitted on October 19, 2018, by Alan M. Perrie of Unionville, Connecticut.)

The Morrison Formation borders the Dinosaur Ridge Trail. image. Click for full size.

Photographed By Abigail Perrie, August 25, 2018

2. The Morrison Formation borders the Dinosaur Ridge Trail.

Credits. This page was last revised on October 21, 2018. It was originally submitted on October 19, 2018, by Alan M. Perrie of Unionville, Connecticut. This page has been viewed 177 times since then and 42 times this year. Photos: 1, 2. submitted on October 19, 2018, by Alan M. Perrie of Unionville, Connecticut. • Andrew Ruppenstein was the editor who published this page.