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GC1GJ7E

Earthcache Garden of the Gods - Sentinel Rock
A  cache by Me & Bucky       Hidden: 9/23/2008  
Size: Size: Not chosen (Not chosen)      Difficulty: 2.5 out of 5      Terrain: 2 out of 5 (1 is easiest, 5 is hardest)

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N/S ? ??.??? W/E ??? ??.???  []
In Colorado, United States

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This EarthCache is located in Garden of the Gods Park, a Colorado Springs City Park. Park hours are as follows: May 1 – October 31, 5 am – 11 pm; November 1 – April 30, 5 am – 9 pm. There is no charge for entry into the park.

Sentinel Rock is composed of two of the rock formations which are found in the central part of the park: Fountain Arkose and Lyons Sandstone.

Fountain Arkose, found primarily on the west side of Sentinel Rock, is a conglomerate made up of coarse-grained sediments. An arkose is a rock formed from at least 25% feldspar, and the Fountain Arkose is composed of stream sediments which were deposited as gravels from the erosion of the Ancestral Rocky Mountains millions of years ago. Other rock formations found in the park which are composed of Fountain Arkose include Cathedral Spires, the Three Graces, and the Siamese Twins.

Lyons Sandstone, on the east side, is a quartz sandstone that is the remnant of a field of ancient sand dunes. Over time, the dunes were buried, compacted, and lithified (turned to rock). Ripple marks can be seen in the sandstone, as can cross-bedding which was caused by wind action on the dunes. North Gateway Rock, South Gateway Rock, White Rock, and the Sleeping Giant are all made of Lyons Sandstone. Different colors in these formations are caused by different amounts of iron oxide present in the rocks.

To log this EarthCache, send me an email with the answers to the following: 1.) How long ago were the layers deposited? 2.) Compare the particle size of the Fountain Arkose and the Lyons Sandstone. Which has the larger particles? 3.) Name at least one other way in which the Fountain Arkose and Lyons Sandstone are different.

After you have emailed me the answers to these questions, post at least 1 picture of you with Sentinel Rock in the background.


The above information was compiled from the following sources:

Interpretive Sign at Site.

Colorado Springs City Webpage: Garden of the Gods Park. (visit link)

Colorado Springs City Webpage: Important Events in Garden of the Gods Geology. (visit link)

2007. Chronic H., and F. Williams. Roadside Geology of Colorado, 2nd Ed.

2004. Hopkins, R.L., and L.B. Hopkins. Hiking Colorado’s Geology

Thanks to the City of Colorado Springs and the Parks, Recreation & Cultural Services Department for allowing placement of this EarthCache!


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Logged Visits ( 136 total. Visit the Gallery (129 images) )

Found it134Write note1Publish Listing1

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Cache find counts are based on the last time the page generated.


Cache Logs
 November 18 by Nap~a~lot (21 found)
First find at the park. Great place- great views- Great Day. TFTEC

[view this log]
 November 2 by Quigman (322 found)
Enjoyed the earthcache and this neat park. Next time I will bring the whole family. I was in CO Springs on a biz trip. TFTC!

[view this log]
sentinel rock[1]

 October 23 by magicman/sewjourner (460 found)
Thanks for making us stop here and take time to learn so much. Will send you the answers to the questions. We are from NJ and just love finding Earthcaches. THey make such a difference in the depth that we get form National Parks or special areas in each state. TFTC Thanks for taking the time to set this up.

[view this log]
 October 23 by djohnsons123 (133 found)
Great place... Thanks for bringing me back

[view this log]
two

 October 14 by rowz (20 found)
Hiked an 11K Falcon Wanderers volksmarch through the Garden/

[view this log]

There are more logs. View them all on one page

Current time: 11/22/2009 7:57:24 AM
Last Updated: 11/19/2009 4:36:38 AM
Rendered: From Database
Coordinates are in the WGS84 datum

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