Antietam Formation
Antietam Formation Stratigraphic range: Cambrian | |
---|---|
![]() Anticline in schist of Antietam Formation | |
Type | Formation |
Unit of | Chilhowee Group |
Underlies | Tomstown Dolomite |
Overlies | Harpers Formation |
Thickness | 550 ft |
Lithology | |
Primary | Sandstone, quartzite |
Other | Schist |
Location | |
Region | Appalachia, Eastern United States, and Southeastern United States |
Country | United States |
Extent | Maryland, Pennsylvania, Virginia[1], and West Virginia |
Type section | |
Named for | Antietam Creek |
![](../I/m/Bulletin_799_Plate_6B_Closely_folded_Antietam_Schist.jpg)
Tight folds in schist of Antietam Formation
The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland and West Virginia.[2][3][4] It is largely quartz sandstone with some quartzite and quartz schist. It preserves Skolithos trace fossils dating back to the Cambrian Period.[5]
![](../I/m/Bulletin_799_Plate_2B_Antietam_Schist_photomicrograph.jpg)
Thin section of schist. Porphyroblastic biotite, a, in a dolomitic matrix. The tourmaline, t, is epigenetic.
References
This article is issued from
Wikipedia.
The text is licensed under Creative Commons - Attribution - Sharealike.
Additional terms may apply for the media files.