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GSA Special Papers
Dawn of the Age of Mammals in the northern part of the Rocky Mountain Interior, North America
Author(s)
Geological Society of America

Volume
243
Copyright:
© 1990 Geological Society of America
Geological Society of America
ISBN print:
9780813722436
Publication date:
January 01, 1990
Book Chapter
A statistical assessment of last appearances in the Eocene record of mammals
Author(s)
-
Published:January 01, 1990
Changes in sample size may confound interpretation of faunal change in the fossil record. The record of early Eocene mammals from the Wasatchian Land-Mammal Age in the Clark’s Fork Basin, Wyoming, shows a high correlation between the square root of sample size and species richness. This correlation suggests that Schankler’s (1980) Biohorizon A, a faunal turnover composed mainly of disappearances, is largely an artifact of sampling fluctuation. Within the interval of Biohorizon A, sample size drops from record high to record low values.
Monte Carlo simulation of the drop in sample size across Biohorizon A demonstrates the role of sampling...
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Index Terms/Descriptors
- Bighorn Basin
- biostratigraphy
- Cenozoic
- Chordata
- Clark's Fork Basin
- correlation
- Eocene
- lower Eocene
- Mammalia
- Monte Carlo analysis
- North America
- Paleogene
- range
- simulation
- species diversity
- statistical analysis
- stratigraphy
- Tertiary
- Tetrapoda
- United States
- Vertebrata
- Wasatchian
- Western Interior
- Wyoming
- Elk Creek
- Homogalax
- Fifteenmile Creek
- Antelope Creek
- Tetonius
- Arctodontomys
- Dorsey Creek
- Phenacodus vortmani
Latitude & Longitude
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