More Lebanese soft bodies

OB

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Amazing quality, what's with the dendrites? Ink?
 

Hajar

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Hi Ob. I think the dendrites are just the usual - post-depositional pyrolusite (manganese dioxide). There's a baby skate in the top right hand corner with pyrolusite dendrites in the position of its eyes.

Here attached is a sketch showing the position of the ink sac (I want to write "sack", but I see this written "sac" even in English texts).
 

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Hajar

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A few more pictures (now that I'm back from "the most important of all the unimportant things in the world", i.e. football). Here you go cuttlegirl, a close-up of the tail end of the gladius in the laterally-preserved animal. The white layer at the top is made of francolite (carbonate fluorapatite) - it fluoresces spectacularly under UV light.
 

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OB

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Hajar;165848 said:
Hi Ob. I think the dendrites are just the usual - post-depositional pyrolusite (manganese dioxide).
OK, that explains the dendrites dorsally, I had trouble making sense of it otherwise :wink: I take it the ink has a tendency to solidify post mortem, for such a three dimensional shape to remain, even following fossilization?
 

cuttlegirl

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Thanks Hajar. That is so cool, cuttlebones today have a top layer (that corresponds to the francolite layer) and then the chambers are laid down laterally and ventrally from the top layer.

I found a google book that has nice drawings of the anatomy of some cephalopods. Starts on page 559. It's an old book (1861), but with incredibly detailed illustrations. It doesn't concentrate on cuttlefish as much as I would like, but has some octopus anatomy and Nautilus anatomy.

http://books.google.com/books?id=zd0UAAAAQAAJ&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

Also, this book starting on page 517.

http://books.google.com/books?id=V1sgAQAAIAAJ&pg=PA546&lpg=PA546&dq=cuttlebone+anatomy&source=bl&ots=FW_O6PG2IY&sig=x1AAShnPAPvE9bmTUWFLbxOkqxg&hl=en&ei=3srSTJCnNsX6lwffz9DlDg&sa=X&oi=book_result&ct=result&resnum=9&ved=0CDkQ6AEwCA#v=onepage&q&f=false
 

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