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Aspects of the palynology of the Chinle Formation (Upper Triassic), Colorado Plateau, Arizona, Utah, and New Mexico

Open-File Report 82-937

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Abstract

This study deals with 16 palynological samples from Arizona, New Mexico, and Utah, that represent six members of the Chinle Formation of Late Triassic age. The samples, in ascending sequence, show a gradual change in the spore-bisaccate ratio from a preponderance of spores to numerical dominance of bisaccate pollen grains. This change is interpreted to indicate a climatic trend toward increasing aridity. The trend is thought to represent the decreasing energy phase of the oldest of three depositional cycles posited by Lupe (1977, 1979). The late Karnian age indicated for the Chinle Formation by pollen and spores is based on material from the lower part of the formation, leaving open the possibility that the upper part of the Chinle may be younger.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Aspects of the palynology of the Chinle Formation (Upper Triassic), Colorado Plateau, Arizona, Utah, and New Mexico
Series title:
Open-File Report
Series number:
82-937
Edition:
-
Year Published:
1982
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
21 p. ill., map ;28 cm.