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GC7RC9G
A River Runs Through ItType: Earth | Size: Other 
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| Terrain:  By: LolosDream @ | Hide Date: 06/17/2018 | Status: Available Country: United States | State: Colorado Coordinates: N39° 32.871 W107° 19.428 | Last updated: 08/30/2019 | Fav points: 0 
At the posted coordinates you will find a kiosk sign titled Colorado's Geologic History in 7 Steps, which covers the brief history of Colorado Geology. This earth cache however will focus on a prominent feature and process that helped shape this entire region. GENERAL GEOLOGY OF THE GLENWOOD SPRINGS AREA "The scenery and topography that you will see while visiting Glenwood Springs have formed over billions of years through multiple episodes of mountain-building and uplift, widespread seas, swamps, down-cutting and erosion, dissolution, and collapse. The uplift of the White River Plateau to the north, folding of the Grand Hogback Monocline, deformation and subsidence of the Eagle Valley Evaporite, downcutting of the Colorado and Roaring Fork Rivers, Tertiary volcanism, and mineralized hot springs have produced the existing geologic environment in the Glenwood Springs area". The town of Glenwood Springs is situated at the confluence of the Colorado and Roaring Fork rivers. 
What you see around you is the present day topography of the area. Formation occurred through valley erosion, which was accelerated during the Pleistocene Ice Ages. The deposition of alluvium ( deposit of clay, silt, sand, and gravel left by flowing streams in a river valley or delta, typically producing fertile soil) and colluvium (sediment deposited at the base of a hillslope by un-concentrated surface runoff or sheet erosion). "Alluvial gravel terraces cover the eroded bedrock surfaces on the floors of the present day valleys. Along the edges of the valleys, colluvium and debris-fan deposits often overlie the terrace gravels". Source: Kirkham, Robert M. & Matthews, Vince. Guide to the Geology of the Glenwood Springs Area, Garfield County, Colorado. October 2000. To gain credit for this earth cache find, you must answer the following questions: 1. Look north across the river and observe the modern geopgraphy and geology of the area. What unique geologic feature to this area is harnessed for modern recreation? 2. What major geologic process helped with the formation of what you see north east of the sign? 3. In what Ice Age did the process from question #2 become escalated? 4. Looking at the hillside terraces can you observe colluvium or alluvium deposits? Why or why not? BONUS: Not required but can add to the fun, and prove you were on site to answer these questions. Please post a picture of you and/or your group and/or your GPS at GZ. Don't forget to smile!
NOTE: If you post ANY answers to the questions above in your log (encrypted or not) it will be deleted. If you fail to send an e-mail within 7 days of your 'found' log, your log will be deleted. If you are caching as a group, only one e-mail needs to be sent. The person sending the answers MUST reference each individual in the group by caching name, no need to send 12 e-mails when one e-mail with 12 usernames will be sufficient.
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