Texas Permian Brachiopods ID Help

[historianmichael]

Over the weekend I joined the Dallas Paleo Society on a field trip to two road cuts near Cisco exposing the Early Permian Camp Colorado Limestone and Watts Creek Shale. The Camp Colorado Limestone had many more brachiopods and I have been able to identify everything to a genus level except for these two. Does anyone know what these are? I initially thought that the second was Derbyia sp. but it seems a little different than the other chunks of Derbyia I found. Perhaps it is a juvenile Derbyia? Any help would be greatly appreciated. Thank you so much!

 

#1

  

 

#2

 

[ClearLake]

Those are nice looking. I was thinking of going on that trip, but opted not to make the fairly long drive as they didn’t make it sound like the cuts would be very productive. Probably should have gone anyway. As far as ID’s, #2 does look like a juvenile Derbyia to me, or at least it’s the closest match I see.   #1 is a bit tougher, my best guess would be Reticulatia based on the shape and spines but I can’t really tell how inflated your specimen is. But, the productids are very difficult so I could easily be wrong. I’m always interested to hear what others have to say.   Would love to hear what else you found there. 

[historianmichael]

1 hour ago, ClearLake said:

#1 is a bit tougher, my best guess would be Reticulatia based on the shape and spines but I can’t really tell how inflated your specimen is

It is rather flat, which has thrown me off. It is certainly not as inflated as some of the other productids I have found and posted on here looking for ID help. Here is another photo showing its profile:

 

 

 

1 hour ago, ClearLake said:

Would love to hear what else you found there. 

I would agree with the trip leaders' assessments that the Cisco cuts are not super productive. I think a small group was the right call. Pete said that all of the good layers at the sites had grassed over 20-30 years ago. I was fortunate to find what I did, and my finds are certainly not representative of the group. I think most people were excited to just find some crinoid parts, horn corals, bryozoa, and brachiopods. I kinda knew what to look for and I thought (perhaps selfishly) that I did the best out of the group. To my knowledge, I was the only person to find an articulated crinoid cup on the trip. Kim found seven crinoid arm segments with spines attached to them at the second cut, which was cool to see. I haven't had a chance to photograph more of my finds, but here are three photos that I took on Sunday while collecting.

 

Perimestocrinus ibexensis articulated anal tube

 

Conulariid

 

Perimestocrinus ibexensis dorsal cup

[Tidgy's Dad]

I agree with Derbyia for number two, I don't know number one. 

Nice fossils. 

[ClearLake]

On 12/7/2021 at 11:54 PM, historianmichael said:

but here are three photos that I took on Sunday while collecting

Those are great, thanks for showing.  I guess I'll just have to gather up a list of spots to hit in that area and make the trip sometime.