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Mason Hintermeister posted a new specimen. 4 years, 7 months ago
4 years, 7 months ago4 years, 7 months agoMason Hintermeister has contributed specimen mFeM 58982 to myFOSSIL!
Mason Hintermeister posted a new specimen. 4 years, 7 months ago
Mason Hintermeister has contributed specimen mFeM 58982 to myFOSSIL!
If you click on the Geochronology items, you can narrow it down to a least Miocene. If you like I can do it for you. Traditionally this has been called N. primigenus but as it is virtually identical to the modern species, I would say either species designation is acceptable (I would lean towards what you put down).
Sorry, on my phone the webpage loads with only the formation boxes in frame so sometimes I forget to put in the time period. I’ll fix that. Since it was found in float material, I don’t know which zone it was part of, and I understand the Calvert FM spans through a few stages (3 if memory serves), so I’ll keep it at Miocene. As for species designation, I know there is some debate there. I’ve no opinion on the subject, I just typically put N. cepedianus on my labels, but I put I. desori instead of I. oxyrinchus on my Mako teeth. Just what I happen to use.
There is the Calvert, Choptank and Saint Mary’s Formations going south respectively. This is at the northern end which is strictly Calvert formation. Occasionally, a tooth from the underlying formations will wash up. I have some Eocene float that I have found there (surprisingly in good shape). Members of the Calvert formation are the Plum Point Marls Member, Calvert Beach Member and the Zone-1 Fairhaven Member (at Pope’s Creek and the very bottom at Chesapeake Beach). As it was float I would leave the member off.