This replica Lobolith comes from the Devonian of Oklahoma. Most crinoids were held in place by a holdfast, root-like system. A few species were bottom bobbers and floaters. These unique crinoids are believed to have floated with the currents with the calyx (head) facing down. The Lobolith was chambered and filled with some form of gas produced by the crinoid. The gas caused the crinoid to float and could probably be regulated to allow the crinoid to move up and down in the water column.
(see diagram at right)
4 inches diameter
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