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Rocky Mountain National Park is located west of Estes Park and north and east of Grand Lake. This is a fee area of the National Park Service, and costs $30 per vehicle. This fee is covered in the Rocky Mountain National Park Annual Pass, the Rocky Mountain National Park/Arapaho National Recreation Area Annual Pass, and the America the Beautiful Pass. Please see the following website (visit link) for the entire fee schedule. The park is open 24 hours a day, 365 days a year. Road and Trail Conditions and Closures can be found at: (visit link) Recorded information for the condition of Trail Ridge Road can be found by calling (970) 586-1222. Please remember that all geologic features within the borders of Rocky Mountain National Park are protected by law, as are all natural and historic features. Please do not disturb, damage, or remove any rocks, plants, or animals.
The Fall River Glacier once covered this valley with hundreds of feet of ice. To the northwest, you can see the U-shaped valley and bowl-shaped cirques that are evidence of the glacial effects on this landscape. Most of the sculpting of the mountains in front of you was conducted during the Pinedale age of glaciation. This was the third of the three primary glacial periods which were to carve the mountains of the Front Range.
Ice from the glaciers at this time was hundreds of feet thick. When it moved down the valleys, it pushed everything in its path like a huge U-shaped bulldozer. Valleys were smoothed, widened, and deepened. Rock and soils were picked up, mixed together, and deposited as till. Often, this material was carried several miles from its origin.
As the Fall River Glacier retreated, massive chunks of the ice broke off and were buried in the sediments which were left behind. The weight of this ice formed depressions. When the ice melted, these depressions filled with water and became the ponds known as the Sheep Lakes.
To receive credit for this EarthCache, send me an email with the answers to the following questions:
1.) How deep was the ice in this valley?
2.) When did the Fall River Glacier begin to recede?
3.) What kind of ponds are the Sheep Lakes?
Please consider posting photos of yourself, or the local geology, when you log this EarthCache. Photos can be an additional rewarding part of your journey, but posting them is not a requirement for logging this EarthCache, and is strictly optional.
The above information was compiled from the following sources:
2004. Rocky Mountain National Park. In Harris, A.G. et al., editors. Geology of National Parks, Sixth Ed. P. 337-356. Dubuque, Iowa: Kendall/Hunt Publishing Company.
Cole, J.C., and Braddock, W.A. 2009. Geologic map of the Estes Park 30’ x 60’ quadrangle, north-central Colorado: U.S. Geological Survey Scientific Investigations Map 3039, 1 sheet, scale 1:100,000, 1 pamphlet, 56 p.
Colorado Geological Survey. 2003. Messages in Stone. Matthews et al., editors. Denver, Colorado.
KellererLynn, K. 2004. Rocky Mountain National Park. Geologic Resource Evaluation Report. NPS D307, September 2004. Online at: (visit link)
Rocky Mountain National Park. Online at: (visit link)
Informational signage at the site.
Rocky Mountain National Park was most helpful in the background discussion, aid in the choosing of sites, and review of this EarthCache. My thanks to the Park for allowing the placement of this EarthCache!
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Last Updated: on 6/15/2018 2:40:42 PM Pacific Daylight Time (9:40 PM GMT)
Coordinates are in the WGS84 datum