Echinoid Hash Plates

[Lone Hunter]

Collected some rocks from the Grapevine Lake area, however I'm wondering if these are from Woodbine or imported rocks?  This is first time I've found any parts of an echinoid, I know some are spines but there are different ones,  I recognize some of the other things but not all so numbered them. The last 2 pics I tried to get shot of tiny baby echinoids,  there may be 2 in one pic but one looks exploded. There were so many things I couldn't even get them all but this will be good start.  

[Lone Hunter]

I got to quit posting so late at night, end up getting lost in the shuffle.  

[JohnJ]

These are bits and spines of a Pennsylvanian age echinoid...most likely, something related to Archeocidaris.

[DPS Ammonite]

I vaguely remember a Forum post about echinoid parts in Texas with two holes that refer to a specific type of urchin. Can anyone find a post?

 

@BobWill  @JohnJ@Uncle Siphuncle

 

 

Edited March 23, 2022 by DPS Ammonite

[Lone Hunter]

There are several of those, just exactly where do they go? Why do some spines have bumps and some have hooks?  Here's few more pics of different things.

[Uncle Siphuncle]

I’ve found Penn aged erosion control rock imported into that area prob from the Chico Ridge near Bridgeport.

[BobWill]

20 hours ago, DPS Ammonite said:

I vaguely remember a Forum post about echinoid parts in Texas with two holes that refer to a specific type of urchin. Can anyone find a post? They are from the Pennsylvanian so John and Dan are right

 

@BobWill  @JohnJ@Uncle Siphuncle

 

 

I couldn't find the post but an unnamed species of Echinocystidae, Schneider, Sprinkle &  Ryder 2005 was described with two holes in plates. They are from the Pennsylvanian so John and Dan are right about the age.

[DPS Ammonite]

48 minutes ago, BobWill said:

I couldn't find the post but an unnamed species of Echinocystidae, Schneider, Sprinkle &  Ryder 2005 was described with two holes in plates. They are from the Pennsylvanian so John and Dan are right about the age.

 

Thanks Bob.

 

Here is a figure of a Texas Pennsylvanian echinocystid from the Color Guide to Pennsylvanian Fossils of North Texas: