Book Chapter
Fossils and geology of the Greenhorn Cyclothem in the Comanche National Grassland, Colorado
By
Steve Miller
Western Interior Paleontological Society, P.O. Box 200011, Denver, Colorado 80220, USA
Steve Miller
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Published:
January 01, 2013
Abstract
The Cretaceous Western Interior Seaway experienced several transgressive/regressive cycles during its existence. The Greenhorn Cyclothem, the sixth such cycle, is significant because of the symmetry of deposition, and because of the expression of cyclical climatically influenced deposits within. This field trip will illustrate evidence of both of these cycles.
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GSA Field Guide
Classic Concepts and New Directions: Exploring 125 Years of GSA Discoveries in the Rocky Mountain Region
Lon D. Abbott
Department of Geological Sciences University of Colorado Boulder, Colorado 80305 USA
Lon D. Abbott
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Gregory S. Hancock
Department of Geology College of William and Mary Williamsburg, Virginia 23187 USA
Gregory S. Hancock
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Geological Society of America
Volume
33
Copyright:
Geological Society of America
© Geological Society of America 2013 ISBN 978-0-8137-5633-2$9
ISBN electronic:
9780813756332
Publication date:
January 01, 2013
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Index Terms/Descriptors
- Archosauria
- Baca County Colorado
- bedding plane irregularities
- Chordata
- climate change
- Colorado
- Cretaceous
- cycles
- cyclothems
- Dakota Formation
- deposition
- Diapsida
- dinosaurs
- field trips
- fossil localities
- fossils
- Greenhorn Limestone
- guidebook
- leaves
- marine environment
- Mesozoic
- North America
- Ornithischia
- Ornithopoda
- planar bedding structures
- regression
- Reptilia
- ripple marks
- road log
- Saurischia
- sea-level changes
- sedimentary structures
- shells
- stratigraphy
- Tetrapoda
- Theropoda
- transgression
- United States
- Upper Cretaceous
- Vertebrata
- Western Interior
- Western Interior Seaway
- Greenhorn Cyclothem
- Timpas Limestone
- Comanche National Grassland
Latitude & Longitude