Ancient Seas, North America, New York, Orleans County, Rochester Shale Formation, Lower Silurian, ca. 425 million years ago. This is a fine pair of fossilized trilobites within separate stone matrices. The first trilobite is in the Bumastus family, encased in the slightly squarer matrix, prepared with the surrounding stone excavated so the body is in low relief. A few shell impressions from brachiopods are present in the surrounding shale. The other trilobite is in the Proetida genus, and has the "classic" trilobite ovoid shape, with the headshield flush against the sides. The surface is a lustrous umber brown with the ridges of the thorax segments and spine nicely preserved. The matrix contains small fragments of other marine fossils. Size (Bumastus matrix): 4" L x 3.5" W x 0.75" H (10.2 cm x 8.9 cm x 1.9 cm); (fossil): 1.25" L x 0.75" W (3.2 cm x 1.9 cm)

For more information on the Rochester Shale Formation visit the American Museum of Natural History website and the article "Trilobites of the Rochester Shale, New York."

Provenance: ex-Stein collection, Bloomfield Hills, Michigan, USA, acquired prior to 2010

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#164122

Trilobites are excavated near the edge of matrix. Trilobites are intact with no restoration and all original material. Fossilized impressions and fragments from other fossils within both matrices.