Geology of the Upper Arkansas Valley
CSS 2018 Fall Field Trip
September 15-16, 2018
Led by Karl Kellogg, Cal Ruleman, and Scott Minor, USGS
We spent Two Days examining diverse Geologic features of the beautiful Upper Arkansas Valley:
- Proterozoic sedimentation, volcanism, and plutonism
- Laramide Orogeny structural features
- Northern Rio Grande Rift and Upper Arkansas Valley magmatism, tectonism, and sedimentation
- Pre-rift intrusive rocks and Oligocene and Eocene volcanic rocks
- Glacial history and deposits including catastrophic outwash floods
- Mineral deposits (gold, silver, copper, zinc, lead, fluorspar, and others)
- Landslide, alluvial, mass-movement, eolian, and wetland deposits
There was something for everyone.
CSS Upper Arkansas field trip Details, Sept. 15 and 16, 2018 is a short description of the geologic features and processes we examined.
See CSS Upper_Arkansas_Field Trip Guide, 2018-Sept for a complete guide.
The group spent one night at motel and camping in Buena Vista. Travel was by personal car-pooling.
From Kellogg, K.S., Shroba, R.R., Ruleman, C.A., Bohannon, R.G., McIntosh, W.C., Premo, W.R., Cosca, M.A., Moscati, R.J.,and Brandt, T.R., 2017, Geologic map of the upper Arkansas River valley region, north-central Colorado: U.S. Geological Survey Scientific Investigations Map 3382, pamphlet 70 p., 2 sheets, scale 1:50,000.
Get the full map at https://doi.org/10.3133/sim3382
The 2012 field trip to see evidence of Catastrophic Glacial Outburst Floods on the Upper Arkansas has additional information.
Thanks to Norma Cady for these field trip photos.