Triassic Park, Frederick County, Maryland

Triassic Park, Frederick County, Maryland
Triassic Park, Frederick County, Maryland


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Semionotus sp.
Period: Late Triassic
Formation: Lockatong Formation (Tentative)
Location: Site TP-0001 Rocky Ridge Vicinity, Frederick County, Maryland)

Late Triassic Semionotus fish
Click HERE for larger view with head of second fish circled.
Click HERE for inverted, enlarged close-up of second fish head (teeth circled).

Water worn fish is 4 1/2" in length, including a toothed-head which may not belong to it. The head is too small and upside down relative to the body, and either represents a fish that was being ingested by the big guy or a smaller one lying beneath it. The specimen was found in the creek bottom as float. Paul Olsen subsequently found two juveniles in sito.


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