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
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]

Thin section of schist. Porphyroblastic biotite, a, in a dolomitic matrix. The tourmaline, t, is epigenetic.

References

  1. ↑ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
  2. ↑ Antietam Formation in West Virginia, USGS
  3. ↑ Antietam Formation in Pennsylvania, USGS
  4. ↑ Maryland Geological Survey, Volume 10, Johns Hopkins Press, 1918 p. 200
  5. ↑ Geology of West Virginia's Blue Ridge
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