Antietam Formation

Antietam Formation
Stratigraphic range: Cambrian Stage 3[1]
Anticline in schist of Antietam Formation
TypeFormation
Unit ofChilhowee Group
UnderliesTomstown Dolomite
OverliesHarpers Formation
Thickness550 ft
Lithology
PrimarySandstone, quartzite
OtherSchist
Location
RegionAppalachia, Eastern United States, and Southeastern United States
CountryUnited States
ExtentMaryland, Pennsylvania, West Virginia, Virginia,[2] and Tennessee
Type section
Named forAntietam 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]

References

  1. 1 2 3 4 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". Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen. 281 (2): 135–154. doi:10.1127/njgpa/2016/0592. ISSN 0077-7749.
  2. ↑ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
  3. ↑ Antietam Formation in West Virginia, USGS
  4. ↑ Antietam Formation in Pennsylvania, USGS
  5. ↑ Maryland Geological Survey, Volume 10, Johns Hopkins Press, 1918 p. 200
  6. ↑ "Geology of West Virginia's Blue Ridge". Archived from the original on 2016-03-04. Retrieved 2015-03-25.
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