Graptolites from the Martinsburg Formation, Lehigh Gap, Eastern Pennsylvania
Journal of Research of the U.S. Geological Survey
Work done in cooperation with the Pennsylvania Department of Environmental Resources, Bureau of Topographic and Geologic Survey
By: Jack Burton Epstein and William B. N. Berry
Links
- Document: Report (22.2 MB pdf)
- Download citation as: RIS | Dublin Core
Abstract
Graptolites collected from the uppermost part of the Martinsburg Formation (Pen Argyl Member) at and near the contact with the overlying Shawangunk Formation at Lehigh Gap, Pa., indicate that the uppermost Martinsburg is as young as Edenian to early Maysvillian (upper subzone [Climacograptus spiniferus subzone] of zone 13 | Orthograptus truncatus intermedius zone]). The Martinsburg gradationally overlies the Jacksonburg Limestone of late Middle Ordovician age, suggesting a lower age limit for the Martinsburg.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Graptolites from the Martinsburg Formation, Lehigh Gap, Eastern Pennsylvania |
| Series title | Journal of Research of the U.S. Geological Survey |
| Volume | 1 |
| Issue | 1 |
| Year Published | 1973 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 6 p. |
| First page | 33 |
| Last page | 38 |
| Country | United States of America |
| State | Pennsylvania |
| Other Geospatial | Lehigh Gap |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |