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Name:
Erisocrinus typus & Stellarocrinus bilineatus
Age: Pennsylvanian
Formation: Bond Formation (LaSalle Limestone)
Location: Pontiac, Illinois
Size: Plate is 4.7" X 5.7"
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Here is a wonderful plate of crinoids from the Pennsylvanian strata near Pontiac, Illinois. This crinoid slab was collected many years ago, as the quarry has been filled with water and closed to collecting for almost 25 years. Many authorities believe that this site produced the finest Pennsylvanian crinoids in the world! There are two different crinoids on the plate. On the left side is a rare example of Erisocrinus typus. This crinoid has a bowl-shaped cup with stout, biserial arms. A large Stellarocrinus bilineatus is on the right side of the plate. This crinoid has a small cup composed of highly sculpted plates and multi-branching, biserial arms. This crinoid still has a portion of the stem intact. The spiked anal tube, with Platyceras gastropod attached, is exposed on the reverse side of the plate. Both crinoids are very 3-dimensional and exhibit exquisite plate structure. The pinkish-white color of the ''sea lilies'' contrasts nicely with the gray matrix. They are well positioned on the plate of limestone that also contains numerous crinoid fragments and a black Platyceras gastropod. There is also another small crinoid on the back side of the plate. This is a beautiful display plate of Pennsylvanian crinoids from a closed location.
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