LK Heteromorph Ammonite Mariella IF-A-16-015Mariella (Plesioturrilites) sp. Main Street Limestone Lower Cretaceous (Albian) Tarrant County, Texas This is a segment of a large heteromorphy ammonite. The specimen comes with its original matrix, but the fossil is not attached to the rock. The specimen has two whorls. The genus is a medium to large conical shell that can reach one foot in length with a diameter of 8 inches. The body chamber uncoils but is rarely found in place. The whorls coil
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