The American species of Orthophragmina and Lepidocyclina

Professional Paper 125-D



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.
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
DOI 10.3133/pp125D
Year Published 1920
Language English
Description 67 p.
First page 39
Last page 105
Country United States
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