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Mesoceph

Orthocone nautiloids

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Mesoceph

I should preface this post by saying that the Paleozoic, marine ecosystems, and invertebrates are not generally my primary expertise, so I apologize if I am wildly off base or asking stupid questions.  Sadly, I did not find these specimens myself, and so I do not have any particularly useful information on age or location.  They were left in a desk drawer along with a collection of other invertebrate fossils, most (if not all) of which are Paleozoic in age.  I have several different specimens of orthocone nautiloids, and I would love to know if anyone can refine that identification further.  To make the situation more difficult, the siphuncle is only preserved in one of the specimens so far as I can tell (first set of photos below).  For this specimen, the diameter of the nautiloid is ~3.5 cm (depending on exactly where it is measured), the inner diameter visible on top and the diameter of the siphuncle on the bottom are 4 mm, and the outer diameter is 8 mm.  Here are the pictures.  Thank you in advance for your time and input.

 

Specimen #1:

 

DSCN0466

 

DSCN0465

 

DSCN0464_crop

 

DSCN0463_crop

 

Specimen #2:

 

DSCN0459_crop

 

 

DSCN0457_crop DSCN0462_crop

 

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Mesoceph

Thank you!  I appreciate the feedback.  

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