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Possible orthocone?


CSimpson176

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Found this while searching the creeks located around my farm. I find a lot of bryozoans, brachiopods, crinoid stems and that’s about it. Never have found a fossil like this around here before, though I know Northern Kentucky has found orthocone fossils before. Interested in what you all think!

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FA21569A-6CE6-4955-93D1-B1D309894BC8.jpeg

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Can we see pictures of the ends? 

    Tim    -  VETERAN SHALE SPLITTER

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It's not real clear, but I think the internal shapes look more like septa than lumen cast to me so I would say yes, nautiloid orthocone.

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29 minutes ago, CSimpson176 said:

Thanks @Rockwood! Could you explain the difference between septa and lumen?

The pizza wheel here is a lumen cast in a crinoid stem section. It's just one example, but notice the plate shape. The voids are where the columnals have dissolved away.

Nautiloid septa are usually more curved (bowl shaped) and appear more as deviders between the chambers (camerae).

The shape that is somewhat recessed just above and left of center in the third photo down I think may be the curve (septal neck) where a septa meets the siphuncle. 

IMG_1070.JPG

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Here is a similar preservation of a nautiloid with a cast of the siphuncle and septa. The septa do not have recurved necks in this example though.

IMG_4946.JPG

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