Fossil Living Chamber

An ammonoid body chamber found last weekend. An Arctocerid probably churkites. Like the others, the body chamber filled with mud that partially lithified, protecting it from the crushing weight of the sediment. Unlike most of the others, the phragmocone left an impression in the soft muddy bottom which also partially lithified, or at least got hard enough to protect it.

Also a photo of Jim Jenks, a fellow triassic ammonoid enthusiast.

and yours truly:old:
 

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