Stratotype for the Ordovician-Silurian boundary. Figured out by Charles Lapworth, using graptolites.
Stratotype for the Ordovician-Silurian boundary. Figured out by Charles Lapworth, using graptolites. See how many different varieites you can find.
Mudcracks in limey red shale with a mud chip and raindrop impressions.
Exemplars of the "Passage Creek Fauna" can be seen in this slab collected at the state Fish Cultural Center near Waterlick, Virginia. Brachiopods, crinoids, and a prominent straight nautiloid.
Exposed at State Fish Hatchery, near Waterlick, VA.
44 31 59 N 107 58 15 W - 360*
44 36 8 N 108 8 27 W - Facing West
44.594456, -108.151041 - Facing South West
44 36 53 N 108 9 31 W - Facing North
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