Eurypterids
Specimen of the Month
Samuel J. Ciurca, Jr., Rochester, New York        by  Eurypterids.net
MARCH 2010
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Horseshoe Crabs
FROM A CIURCA EURYPTERID COLLECTION
Mazon Creek Split Nodule with Horseshoe Crab. Nodule (sideritic concretion) is 5.5 cm in diameter and was
recovered from Mazon Creek, Coal City, Illinois, United States. Over 400 species of plants and animals are known from the
Mazon Creek Biota including eurypterids and horseshoe crabs. And over 200 papers have been published on the topic.
A fascinating and instructive read is MAZON CREEK FOSSILS (1979), edited by Matthew H. Nitecki and published by
Academic Press (581 pages).
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Pseudoniscus roosevelti (Clarke), collected from the Pittsford Member,
Vernon Formation, Salina Group near the Erie Canal at Pittsford, New York.
Specimen about 2.5 cm long. The shale and mudstone of the Pittsford Member
harbor countless numbers of eurypterids (
Hughmilleria socialis and Eurypterus
pittsfordensis
) and occasional horseshoe crabs and other creatures.

CHECK OUT: "Prehistoric Pittsford" at  http://eurypterid.net

CHECK OUT XIPHOSURA: http://tolweb.org/Xiphosura/2538
Pseudoniscus roosevelti
A fine specimen, about 2.5 cm in length, from the
Pittsford Member ("Pittsford Black Shale"), lower
Vernon Formation, Salina Group at near the Erie
Canal, Pittsford, New York.
Specimen: 121103-14 from the Spring House
Commons Site (in the author's collection).
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