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Fossil Living Chamber

Architeuthoceras

Architeuthis
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This is the best I could do last weekend. Just the mud infill of the body chamber of a large endocerid, would have been about 4 to 5 feet long I guesstimate. A small peice of the endocones is visible in the first photo (upper right corner), with some mud filling the siphuncle at the end of the body chamber producing the nob. And an end view showing the shape of the shell and location of the siphuncle.
 

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Phil

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Sorry Kevin, maybe I am being stupid but I can't see the siphuncle. Is it centrally placed?

Great find.
 

Architeuthoceras

Architeuthis
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Here are two casts of body chamber and siphuncle found in shale over the weekend. They are both showing the bottom side, hence the small trilobite mold in the upper pic is a mold of the top of the trilobites shell. There is also a graptolite laying along side the siphuncle in the top pic. Also in the top pic you can see a ghost of the phragmocone and chambers that dissolved probably before the surrounding shale turned to stone.
 

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Architeuthoceras

Architeuthis
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Here is an internal mold of the body chamber and siphuncle inside an external mold of the shell. All trace of the shell material has dissolved leaving the internal mold and a hollow where the gas filled chambers and the shell material used to be. The shell in this example probably dissolved after the surrounding mud had turned to stone, so the hollow was preserved.
 

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