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GSA Special Papers
Geological Implications of Impacts of Large Asteroids and Comets on the Earth
Author(s)
Geological Society of America

Volume
190
Copyright:
© 1982 Geological Society of America
Geological Society of America
ISBN print:
9780813721903
Publication date:
January 01, 1982
Book Chapter
Biomere boundaries: A possible test for extraterrestrial perturbation of the biosphere
Author(s)
-
Published:January 01, 1982
Remarkable extinctions of shelf and epicontinental sea trilobite faunas at several times in the Cambrian, separated by periods of several millions of years, provide markers for the boundaries of Biomeres. At several boundaries, the abrupt change from a high diversity fauna with low individual dominances to a low diversity fauna dominated by only one or two species takes place within a few centimeters of section. There is no evidence in the beds below the extinction event of any signs of community deterioration. The best documented change, between the Late Cambrian Crepicephalus and Aphelaspis Zones can be recognized in sections from...
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Index Terms/Descriptors
- Arizona
- Arthropoda
- Basin and Range Province
- biofacies
- biostratigraphy
- Cambrian
- catastrophism
- causes
- concepts
- diachronism
- effects
- extinction
- impacts
- Invertebrata
- marine environment
- Millard County Utah
- Nevada
- North America
- paleontology
- Paleozoic
- shelf environment
- species diversity
- stratigraphic boundary
- taxonomy
- Tennessee
- Texas
- Trilobita
- Trilobitomorpha
- United States
- Upper Cambrian
- Utah
- Wyoming
- zoning
- biomeres
- House Range region
- Desert Range region
- Highland Range region
Latitude & Longitude
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N35°00'00" - N36°45'00", W90°15'00" - W81°40'00" -
N35°00'00" - N42°00'00", W120°00'00" - W114°04'60" -
N41°00'00" - N45°00'00", W111°04'60" - W104°04'60" -
N25°45'00" - N36°30'00", W106°30'00" - W93°30'00" -
N31°15'00" - N37°00'00", W115°00'00" - W109°00'00" -
N29°00'00" - N43°30'00", W122°00'00" - W102°30'00" -
N38°34'60" - N39°34'60", W114°04'60" - W112°02'60"
Citing Books via
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