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The American species of Orthophragmina and Lepidocyclina

Professional Paper 125-D

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Abstract

Orbitoid Foraminifera, on account of their short stratigraphic range, have proved to be excellent horizon markers, and, because of their wide geographic distribution, they are valuable in correlation. The genus Orbitoides, as now restricted, is found exclusively in deposits of Cretaceous age, Orthophragmina appears to be confined to the Eocene; but Lepidocyclina ranges through the upper Eocene and Oligocene.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
The American species of Orthophragmina and Lepidocyclina
Series title:
Professional Paper
Series number:
125
Chapter:
D
Year Published:
1920
Language:
English
Description:
67 p.
First page:
39
Last page:
105
Country:
United States