Guess What? Thing 2

Tintenfisch

Architeuthis
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#4
Or eye lens... but 11cm would be huge, plus the lenses aren't concave on the inner surface... :hmm:
 

Phil

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#5
Looks more like bone to me, but I'm sure it's not! It's not a huge ammonoid spine base or something like that?
 

Architeuthoceras

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#7
Phil got it! :notworth:
Phil;81400 said:
spine base or something like that?
I think, basically just guessing, that it is a node (can't really call it a spine) on the shell of a coiled nautiloid. It is from the Mississippian Chainman Shale where I find a few small coiled nautiloids. This is the thickest piece of shell I have ever found though. Below are a few pics of some of the small nautiloids showing the nodes running along the flank close to the umbilical shoulder. Doing a few calculations on the ratio of diameter/shell thickness of the smaller ones I come up with a diameter of between 450mm and 1050mm (probably closer to the upper figure, shell thickness was greater on the venter where I had to measure some than on the flanks where the nodes are), making it a pretty big shell. :shock:
 

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