From Ohio History Central
Phylum Arthropoda, Euthycarcinoids (?) or Aglaspida (?) Geologic Time: Upper Cambrian (about 510 million years ago) Size (25.4mm=1 inch): Matrix: 7.5 by 6.3 by 1.2 inches Fossil Site: Krukowski Quarry, Elk Mound Group, Mount Simon Sandstone, near Mosinee, Wisconsin. Fossil Code: DD501
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