Earth:Antietam Formation
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| Antietam Formation Stratigraphic range: Cambrian Stage 3[1] | |
|---|---|
 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, West Virginia, Virginia,[2] and Tennessee |
| Type section | |
| Named for | Antietam Creek |
The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland, West Virginia, Virginia, and Tennessee.[3][4][5][1]. In Virginia and Tennessee, it is known as the Erwin Formation.[1] It is largely quartz sandstone with some quartzite and quartz schist. It preserves Skolithos trace fossils dating back to the Cambrian Period.[6] A nevadiid specimen from Tennessee is the earliest known definitive trilobite in the southern Appalachians.[1]
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Tight folds in the schist of Antietam Formation -
Thin section of schist. Porphyroblastic biotite, a, in a dolomitic matrix. The tourmaline, t, is epigenetic.
References
- ↑ 1.0 1.1 1.2 1.3 Hageman, Steven J.; Miller, William (2016-08-01). "New fossil discoveries in the Chilhowee Group (southern Appalachians, USA): evidence for the Ediacaran-Cambrian transition, 'Cambrian Agronomic Revolution', and earliest trilobites at the southern margin of Laurentia" (in en). Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 281 (2): 135–154. doi:10.1127/njgpa/2016/0592. ISSN 0077-7749. http://www.schweizerbart.de/papers/njgpa/detail/281/87052/New_fossil_discoveries_in_the_Chilhowee_Group_sout?af=crossref.
- ↑ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
- ↑ Antietam Formation in West Virginia, USGS
- ↑ Antietam Formation in Pennsylvania, USGS
- ↑ Maryland Geological Survey, Volume 10, Johns Hopkins Press, 1918 p. 200
- ↑ "Geology of West Virginia's Blue Ridge". http://web.wm.edu/geology/virginia/provinces/Blueridge/antietam.html.
Template:Chronostratigraphy of Virginia Template:Stratigraphic column of West Virginia
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