a few Ptychodus teeth to ID

[fossilsonwheels]

I have a few Ptychodus teeth that have no definitive ID and I’d like to change that. I’ve been researching them. I used the great Ptychodus guide on TFF, the Oceans of Kansas website and Shawn Hamms paper. I was able to comfortably ID 2 of the unknowns. Even with all the great information available, I am still not sure on a few. 

 

First one is from the Greenhorn Limestone in Kansas. This one has me stumped. I thought it was a good match for P. polygrus but I found nothing indicating that it was present in the Greenhorn. It has been found in Kansas but I only found references for it in other formations. A small tooth, at right around 1cm wide. 

 

 

[fossilsonwheels]

Another from the Greenhorn Limestone of Kansas. Another one that just stumps me. I thought P. anonymous was most likely based on my limited knowledge but I am not sure if it is known from a the formation.

 

Another small tooth, less than 1cm across.  

[fossilsonwheels]

1 hour ago, fossilsonwheels said:

I have a few Ptychodus teeth that have no definitive ID and I’d like to change that. I’ve been researching them. I used the great Ptychodus guide on TFF, the Oceans of Kansas website and Shawn Hamms paper. I was able to comfortably ID 2 of the unknowns. Even with all the great information available, I am still not sure on a few. 

 

First one is from the Greenhorn Limestone in Kansas. This one has me stumped. I thought it was a good match for P. polygrus but I found nothing indicating that it was present in the Greenhorn. It has been found in Kansas but I only found references for it in other formations. A small tooth, at right around 1cm wide. 

 

 

I mixed up the pictures. This tooth is from Texas. According to my records, Kamp Ranch. It is also the largest of the unidentified teeth. More than 1.5 cm tall and over 1cm wide. 

[Fossildude19]

Have you looked through the Ptychodus ID Guide?

[fossilsonwheels]

This is another Kansas tooth. Greenhorn Limestone. 1cm wide, fairly low crown. This one is another I am stumped on. 

[fossilsonwheels]

3 minutes ago, Fossildude19 said:

Have you looked through the Ptychodus ID Guide?

Yes. Several times plus Elasmo, Hamms paper and the Oceans of Kansas. It is just not clicking for me with the Ptychodus teeth for some reason. 

[fossilsonwheels]

6 minutes ago, Fossildude19 said:

Have you looked through the Ptychodus ID Guide?

I am reasonably certain the first tooth is P. marginalis (polygrus). It does have the fingerprint pattern. 

[fossilsonwheels]

11 hours ago, fossilsonwheels said:

This is another Kansas tooth. Greenhorn Limestone. 1cm wide, fairly low crown. This one is another I am stumped on. 

 

 

I am kind of thinking this could be P. rugosus after checking Hamms description of it. A possibility anyway. I know I am sort of talking to myself in this thread but I think I am making progress on these lol

[Fossildude19]

@Ramo  @BobWill  @Tony Eaton

[Fossildude19]

11 hours ago, fossilsonwheels said:

Yes. Several times plus Elasmo, Hamms paper and the Oceans of Kansas. It is just not clicking for me with the Ptychodus teeth for some reason. 

Sorry - Just wanted to make sure you hadn't missed it. Many people do.   

I've tagged a few people who might help.  

[fossilsonwheels]

4 hours ago, Fossildude19 said:

Sorry - Just wanted to make sure you hadn't missed it. Many people do.   

I've tagged a few people who might help.  

I love that guide. It is really quite informative and well put together. I appreciate the tags. The Kansas teeth actually came from @Ramo but were only ID'd as Ptychodus sp. I am disappointed that I have not been able to ID them but the Ptychodus teeth are pretty tricky, at least for me lol

[Ramo]

I believe all the teeth I sent you are P. anonymous. 

Shawn has personally showed me how to tell some species apart,  and I still cannot!!

 

[fossilsonwheels]

17 minutes ago, Ramo said:

I believe all the teeth I sent you are P. anonymous. 

Shawn has personally showed me how to tell some species apart,  and I still cannot!!

 

Awesome and it’s kind of nice to know I am not the only one who struggles with them lol

[PFOOLEY]

For comparison:

 

First Associated Tooth Set of Ptychodus mammillaris in North America, Pfeifer Shale Member (Lower Middle Turonian), Greenhorn Limestone

 

[fossilsonwheels]

On 9/26/2019 at 8:27 PM, PFOOLEY said:

For comparison:

 

First Associated Tooth Set of Ptychodus mammillaris in North America, Pfeifer Shale Member (Lower Middle Turonian), Greenhorn Limestone

 

Thank you very much for the reference material. Those are some amazing teeth

[PFOOLEY]

You are welcome. Ptychodus are fascinating sharks and I get excited everytime I find their teeth...probably my favorite shark.

 

[fossilsonwheels]

8 hours ago, PFOOLEY said:

You are welcome. Ptychodus are fascinating sharks and I get excited everytime I find their teeth...probably my favorite shark.

 

I have had a lot of fun with the kids we do our programs for when it comes to Ptychodus. They are shocked to know those are shark teeth. It is always fun to see the disbelief on their faces lol