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Gastropod internal moldsUpper Cretaceousright- Navesink Formation Big Brook Colt's Neck, NJ.left 3 Wenonah Formation Ramanessin Brook Holmdel, NJ.
Posted February 21, 2015
Might be Anchura pennata.
Posted February 23, 2015
Possibly. I think the above specimens represent at least two species. It's tough to ID gastropods like this based on internal molds when you're missing shell ornamentation, etc.