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Two Exogyra cancellata shells from the Cretaceous spoils of Reedy Point, Delaware. Although Exogyras typically detached themselves from their anchorage while still very small - about 2-3 cm - these two animals continued to live and grow together. The lower valve is about 10 cm on the long axis.

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Delaware Fossils

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Correction: This is Exogyra costata, not E. cancellata. E. cancellata is an index fossil for the Mount Laurel Formation, which is believed to be the original of all the Reedy Point spoils. E. costata is an index fossil for later formations. However, they did appear at the very end of the Mt Laurel timeframe and have been found at this locality on rare occasion. Although the ornament is heavily distorted by the attachment, this attachment habit is typical of E costata. E. cancellata broke off of its attachment while still relatively small.

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