page_title: Antietam Formation
hierarchical_section_title: Antietam Formation
caption_attribution_description: English: Figure caption: Closely folded Antietam Schist, roadcut on east side of Oak Hill. The folded bedding is outlined by quartz veins and cut at a steep angle by schistosity dipping northwest. Description of the photo from the text of the Bulletin: (The outcrop)...on the southwest limb of the Oak Hill anticline shows northwest schistosity brought out by weathering across the crumpled bedding outlined by quartz injection, which may be related in origin to the post-Cambrian batholith.
context_page_description: The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland and West Virginia. It is largely quartz sandstone with some quartzite and quartz schist. It preserves Skolithos trace fossils dating back to the Cambrian Period.
context_section_description: The Antietam Formation or Antietam Sandstone is a geologic formation in Pennsylvania, Maryland and West Virginia. It is largely quartz sandstone with some quartzite and quartz schist. It preserves Skolithos trace fossils dating back to the Cambrian Period.
caption: Tight folds in schist of Antietam Formation
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