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- W2605000211 abstract "A large collection of silicified platyceratid gastropods from the Ridgeley Member of the Oriskany Sandstone, near Cumberland, Maryland, contains specimens of Platyceras (Platyceras) gebharti Conrad, color marked in a pattern of dashes and zigzags. This is the first report of color patterns in Devonian platyceratids from North America. Other platyceratids at the locality include Crossoceras belandi Boucot and Yochelson, P. (P.) magnificum Hall, and P. (Orthonychia) tortuosum Hall. Platyceras gracile Ohern and P. subconicum Ohern are placed in synonymy of P. (Orthonychia) tortuosum. All species show a high degree of individual variation. About one-fifth of the specimens are bored and probably were dead shells lying on the bottom. Others, not bored, show a size distribution suggestive of a living population, but the environment of deposition indicates some post-mortem transport. Crinoids, upon which the platyceratids lived, could have been overwhelmed by an influx of sand that buried the animals. Silicification may have followed shortly thereafter. Preservation of a color pattern in this one species demonstrates that silicification did not occur by filling of a mold." @default.
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- W2605000211 date "1974-05-01" @default.
- W2605000211 modified "2023-10-04" @default.
- W2605000211 title "Platyceratid gastropods from the Oriskany Sandstone (Lower Devonian) near Cumberland, Maryland; synonymies, preservation and color markings" @default.
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