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3 Cards in this Set
- Front
- Back
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Genus Lingula |
-Ordovician -long pedicle, anchored it to the sea floor -sessile -thin, tongue shaped shell -vertical burrows in intertidal areas |
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Genus Atrypa |
-shells round to egg shaped, radial ridges -"late Lower Silurian (Telychian) to the early Upper Devonian (Frasnian)" |
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Genus Composita |
-Devonian to Permian -smooth shell with fold -round opening for pedicle |
