English: Ventral cross section of an articulated Cremnoceramus deformis in rough block of Fort Hays limestone on the west additions of the First United Methodist Church, Hays, Kansas. Observe the typical colonization of the top shell (flipped) by Ostrea congesta.
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Cross section of an articulated Cremnoceramus deformis index fossil in a sawn block of Fort Hays limestone on the west additions of the FUMC, Hays, Kansas..