Jump to content

Recommended Posts

13 hours ago, deutscheben said:

That is a very cool tooth! I love the color and the unusual stippling pattern. I don't think it is Peripristis, as it does not look like any of the examples I have seen. But I don't know what it is- there are a number of Pennsylvanian genera with a similar low jagged ridge shape, like Chomatodus, or Venustodus... perhaps @Archie or @Elasmohunter or one of our other Carboniferous tooth folks have an idea?

Yeah I was definitely spitballing on the ID. I have very little knowledge about chondrichthyans, but these teeth are quickly becoming my new fascination.

Link to comment
Share on other sites

Here's another cool find, which I only recognized thanks to @deutscheben's recent trip report from here as well. A nice association of a crushed brachiopod with spines attached and a crushed Archaeocidaris urchin. At first I thought only isolated spines were present but it appears that the test is partially present as well.

IMG_7089.thumb.jpg.d63dd34a47921a6448cd9891b51c4eec.jpg 5da93ea7a9c4a_IMG_70882.thumb.jpg.83fc4f10aac66229f28ea478825feccd.jpg

 

  • I found this Informative 1
Link to comment
Share on other sites

Could you point out the parts you are attributing to Archaeocidaris

The human mind has the ability to believe anything is true.  -  JJ

Link to comment
Share on other sites

On 10/18/2019 at 1:27 AM, JohnJ said:

Could you point out the parts you are attributing to Archaeocidaris

The leftmost spine on the bottom certainly looks like an Acrchaeocidaris spine to me. That said, I'm not longer sure if there's any more to it. None of the other spines display any sort of protrusions, and what I first through was the test may just be conspicuously placed debris. I'm going to try and prep it out a bit more.

Link to comment
Share on other sites

On 10/17/2019 at 1:38 AM, connorp said:

Turned out to be a spectacularly gorgeous shark tooth. Only a partial, but I'm still ecstatic. Not sure on the ID, maybe Peripristis?

 

IMG_7080.thumb.jpg.e912cd2fcec8084c99661a77add03be7.jpg IMG_7081.thumb.jpg.deec5a12fe5ca38bf2a41351001febf9.jpg

I believe I found an ID on this guy – Cymatodus oblongus. It was described from a single tooth in the Geological Survey of Illinois Vol. 4.

c1.thumb.png.e12e8a6cd25efdd7e6d1a5f8f970dab3.png c2.png.bb81c197f43f2929a0a3aaba91359df8.png (Figure 7a)

 

Here is a related tooth Paracymatodus from the Pennsylvanian of Russia (Handbook of Paleoichthyology Vol. 3D). The stippling pattern is very similar to mine.

IMG_7105.thumb.jpeg.2e8906da941e2b88a5e4c400e0c20a35.jpeg

 

 

  • I found this Informative 2
Link to comment
Share on other sites

42 minutes ago, connorp said:

The leftmost spine on the bottom certainly looks like an Acrchaeocidaris spine to me. That said, I'm not longer sure if there's any more to it. None of the other spines display any sort of protrusions, and what I first through was the test may just be conspicuously placed debris. I'm going to try and prep it out a bit more.

 

It hard to see detail in the photos, but in general, Archaeocidaris spines are more 'saw-like' than branching.  This looks more like a possible fragmented bryozoan or brachiopod spine to me.

 

The human mind has the ability to believe anything is true.  -  JJ

Link to comment
Share on other sites

1 hour ago, connorp said:

I believe I found an ID on this guy – Cymatodus oblongus. It was described from a single tooth in the Geological Survey of Illinois Vol. 4.

c1.thumb.png.e12e8a6cd25efdd7e6d1a5f8f970dab3.png c2.png.bb81c197f43f2929a0a3aaba91359df8.png (Figure 7a)

 

Here is a related tooth Paracymatodus from the Pennsylvanian of Russia (Handbook of Paleoichthyology Vol. 3D). The stippling pattern is very similar to mine.

IMG_7105.thumb.jpeg.2e8906da941e2b88a5e4c400e0c20a35.jpeg

 

 

Very intriguing, that does look like a close match indeed! Good research on that one- if correct, that seems like a rather rare genus. 

 

Regarding the spine, it is hard to tell at that level of magnification, but I do think I see the branching @JohnJ was referring to- under magnification are these seeming projections more apparent? 

 

Inked5da93ea7a9c4a_IMG_70882.thumb.jpg.83fc4f10aac66229f28ea478825feccd_LI.thumb.jpg.b231f4e0fe3d4a1fb9d017cff01bfbd7.jpg

  • I found this Informative 1
Link to comment
Share on other sites

  • 2 weeks later...

Here’s one of the nicer Maquoketa hash plates cleaned up a bit with vinegar.

1F7BA08F-6418-4EF4-A5C6-7201E1AB0486.thumb.jpeg.7b33958296a3ccf660bfc39ea09a0346.jpeg

 

There is this one bit that caught my eye. Seems similar to the Isotelus bits I’ve collected from St. Leon. Thoughts?

3A039C5F-DE39-4E84-A4F2-647947B26A31.thumb.jpeg.c7bb4a7e3b359a1a4bfe8dd211d4de10.jpeg

 

  • I found this Informative 1
Link to comment
Share on other sites

3 hours ago, connorp said:

 Isotelus bits

That is my impression. And the Maquoketa in my area is full of Isotelus.

 

 Mike

  • I found this Informative 1
Link to comment
Share on other sites

  • 3 weeks later...

Made a second trip to hunt the Maquoketa two weeks ago. Didn’t stay long due to the high water and piles of leaves.

AF7F67AE-64AD-4D50-B5C6-97440DEADD27.thumb.jpeg.e93a50cd6f7d7b56096fa8b346fd1af1.jpeg

 

This was a nice find for me. A nearly complete Isotelus hypostome.

9C068103-342E-4B81-8719-C060788AC36F.thumb.jpeg.47c98809534a366be8f42f6ac40a379e.jpeg

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
×
×
  • Create New...