The American species of Orthophragmina and Lepidocyclina
Professional Paper
125-D
By: J.A. Cushman
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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.
| 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 |