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GSA Special Papers
Paleosols and Weathering Through Geologic Time: Principles and Applications
Author(s)
Geological Society of America

Volume
216
Copyright:
© 1988 Geological Society of America
Geological Society of America
ISBN print:
9780813722160
Publication date:
January 01, 1988
Book Chapter
Calcareous paleosols in the Triassic Dolores Formation, southwestern Colorado
Author(s)
-
Published:January 01, 1988
Nodular calcareous paleosols are common in the upper member of the Upper Triassic Dolores Formation in the San Juan Mountains of southwestern Colorado. These soils are developed in reddish brown, very fine-grained sandstone and siltstone of a sand-sheet facies that was deposited by eolian and aqueous processes on the margins of a large Triassic erg. Characteristics of these paleosols include nearly complete destruction of physical sedimentary structures, extensive mottling associated with burrows and root trace fossils, poorly sorted textures, and abundant carbonate nodules.
Vegetative stabilization of the sand sheet is recorded by trace fossils of long, monopodial root systems, and...
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Index Terms/Descriptors
- biogenic structures
- bioturbation
- burrows
- calcareous composition
- clastic rocks
- Colorado
- concretions
- conglomerate
- fluvial environment
- La Plata County Colorado
- lacustrine environment
- lithofacies
- Mesozoic
- Montezuma County Colorado
- mudstone
- North America
- Ouray County Colorado
- outcrops
- paleoclimatology
- paleosols
- Rocky Mountains
- roots
- San Juan Mountains
- San Miguel County Colorado
- sandstone
- sebkha environment
- secondary structures
- sedimentary rocks
- sedimentary structures
- siltstone
- soils
- sorting
- stratigraphy
- terrestrial environment
- textures
- Triassic
- U. S. Rocky Mountains
- United States
- Upper Triassic
- southwestern Colorado
- Dolores Formation
- Scoyenia
Latitude & Longitude
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