New Silurian cyathaspid fish localities have been found in the Wills Creek formation of West Virginia and Maryland. Late Silurian fishes had been reported previously from the same states, Pennsylvania, New Jersey and New York. In the Salina basin, occurrences are restricted to the eastern margin, chiefly in or near the red clastic facies. Eurypterids of the same basin have a different distribution pattern and are found principally in argillaceous carbonates.

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