Only One Available: This is a fossil belemnite from the Cretaceous period. This is a nice, larger example found in Colorado.
Belemnites are an extinct group of squid-like cephalopods that lived during the Jurassic and Cretaceous. They had a hard, internal, cone shaped structure that is often preserved as a fossil though it is not technically a shell. They had 10 arms but unlike modern squid these arms had small hooks instead of suckers.
Belemnites of the species Belemnitella americana are found abundantly in the exposures of the Mount Laurel Formation along the banks of the Chesapeake and Delaware Canal. The fine-grained sands and silts of the Mount Laurel were deposited in a shallow sea during the Late Cretaceous.
Only the bottom portion still remains. The entire animal probably would have been close to a foot long. There are remnants of the shell still left on the rock. It measures 3.25" long and weighs 124 grams.
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