NJ Stream Ammonite

[Fishinfossil]

A few months back I was exploring a new stream in New Jersey and stumbled upon some matrix where I found this Ammonite. I am not too familiar with NJ Ammonites. Can anyone help identify this particular species? I thought it was pretty cool.

[Fishinfossil]

[Fishinfossil]

[Darktooth]

@frankh8147 @Carl @The Jersey Devil

[Pterygotus]

Are you sure this is an ammonite as I’m not seeing resemblance to one.

[Fossildude19]

This looks like a concretion to me.

I am not seeing any sutures which would indicate that it was an ammonite.   

[Jeffrey P]

I would like to see the specimen from some different angles. What I see there doesn't appear to be an ammonite. Bivalve maybe?

[Fishinfossil]

It's hard to tell from the photos, but on the bottom there are distinct ridges and the overall shape is like a hubcap, like a flying saucer in a way. Here's another image or two showing how it stands out form the rest of the matrix. As well, scroll down I am going to include another interesting specimen I found right next to it. I'm not proficient enough to determine what it is, but maybe you all can help.

 

 

 

 

[Fishinfossil]

Here's a side view.

 

 

[Fishinfossil]

And here's the other cool specimen....

 

 

 

[FossilDAWG]

What you have is an internal mold of the interior of a bivalve.  The "distinct ridges" are an impression of the hinge area.

 

Don

[frankh8147]

I agree on bivalve. Here is one of mine that looks similar..

[The Jersey Devil]

It's a nice bivalve cast.

That second specimen is interesting. My first impression was Inoceramus, but I don't think it is that.

[Ludwigia]

Bivalves both.

[Carl]

I'd go with Pycnodonte internal mold for that first specimen. Some of the brooks are loaded with these things. I agree that the second is not likely to be Inoceramus. If you know how to reach Ralph Johnson, he'll know.

[erose]

The second fossil may be Gryphaeostrea vomer. At least that is what the concentric growth lines remind me of.

Edited March 28, 2020 by erose
typo, again!

[Fishinfossil]

@Carl @erose Thanks for the ideas. What era are those species from? Generally, in NJ the streams are cretaceous, but from what I gather the area I was in might have been of older origin.  The Pycnodonte does resemble the spiral of the shell somewhat, and the Gryphaeostrea vomer certainly has a similar appearance.

[erose]

Late Cretaceous. Where did you find these? 

[Fishinfossil]

@erose @The Jersey DevilSmall NJ Tributary outside the regulars  Just chipped away at some matrix today and found a mess of small gastropod type shells, as well as an orange flaky piece which I suspected was something from a shrimp or crab crustacean

then found the pincer of a claw within it. Stoked!

[The Jersey Devil]

14 hours ago, Fishinfossil said:

@erose @The Jersey DevilSmall NJ Tributary outside the regulars  Just chipped away at some matrix today and found a mess of small gastropod type shells, as well as an orange flaky piece which I suspected was something from a shrimp or crab crustacean

then found the pincer of a claw within it. Stoked!

Would love to see pics 

[Fishinfossil]

@The Jersey Devil Will take some images tomorrow and post on separate thread.