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It averaged 8
The Mahogany ledge crops out in the lower 15 m of this sequence
and the maximum height is 13 inches
the lower softer portion is called Comanche Peak
Most of the original shell is preserved and some sutures are also visible through areas where the shell is thin
UK Ammonite Placenticeras IF-UKA-16-003 Lobster It averaged 8Placenticeras meeki Pierre Formation Upper Cretaceous (Campanian) Meade County, South Dakota This example of P. meeki has very colorful red and green iridescence in the preserved original aragonite shell. There are several thin spots in the shell and excellent sutures are visible. There are several limpet scars. The specimen is free of matrix and both sides are excellent. The shell is 9. 5 inches across. The inner most whorl is restored. There is no
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