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Fossil Continental Diatoms: Paleolimnology, Evolution, and Biochronology

Published online by Cambridge University Press:  17 July 2017

J. P. Bradbury  and
W. N. Krebs
J. P. Bradbury
Affiliation:
U.S. Geological Survey, MS 919, Box 25046, Denver Federal Center, Denver, Colorado 80225-0046
W. N. Krebs
Affiliation:
Amoco Production Company, 501 Westlake Park Boulevard, Houston, Texas 77079-2696
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Extract

Diatoms are golden brown algae (class Bacillariophyceae) whose cellular contents are enclosed between two valves or shells of silica. They are classified into groups with radial symmetry (centric diatoms) and axial symmetry (pennate diatoms). The latter are subdivided as raphid and araphid diatoms according to the presence or absence of raphes (slit-like structures) that allow diatoms to move along firm surfaces. Many centric and some araphid diatoms are planktonic, maintained by turbulence in the limnetic region of a lake, whereas raphid diatoms live on the lake bottom or are attached to objects in the illuminated zone.

Type
Research Article
Information
Short Courses in Paleontology , Volume 8: Siliceous Microfossils , 1995 , pp. 119 - 138
Copyright
Copyright © 1995 Paleontological Society 

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