erose Posted April 23, 2018 Share Posted April 23, 2018 It was a beautiful day here in Austin and I decided to get a few quick hours in on some local Walnut Formation exposures. Lower Cretaceous. I think I found the largest Coenholectypus planatus I’ve ever seen. It is slightly crushed but would be a full 5 centimeters in diameter. My largest prior specimen was maybe 4cm. Tell/show me your largest of this species. Link to comment Share on other sites More sharing options...
Heteromorph Posted April 23, 2018 Share Posted April 23, 2018 Nice! Lovely echinoid. Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted April 23, 2018 Share Posted April 23, 2018 Nice echie! Austin, Walnut formation, got it! Bucket list it goes. Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted April 23, 2018 Share Posted April 23, 2018 I’ve seen more in the Kwa than Kgr, but larger in the Kgr. Better avg condition in the Kwa; more compression in the Kgr. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Darktooth Posted April 23, 2018 Share Posted April 23, 2018 Nice find! I wish I could find Echiniods in New York! I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
ynot Posted April 23, 2018 Share Posted April 23, 2018 Nice find! Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Ludwigia Posted April 23, 2018 Share Posted April 23, 2018 We need an echinoid emoticon. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Monica Posted April 23, 2018 Share Posted April 23, 2018 I'm with Dave - I wish I could find echinoids up here in the Toronto area, too!!! Very Link to comment Share on other sites More sharing options...
erose Posted April 23, 2018 Author Share Posted April 23, 2018 13 hours ago, Uncle Siphuncle said: I’ve seen more in the Kwa than Kgr, but larger in the Kgr. Better avg condition in the Kwa; more compression in the Kgr. I also have some big ones from the Kgr but still not a full 2 inches in diameter. In the Walnut at this local they come in all sizes and conditions. I have also never been able to sort out any of the other Walnut/Fredericksburg species from what I have collected over the years. I must have a hundred good specimens of all sizes from at least a dozen locals and I have laid them out and they form a perfect gray scale of small to large, round to pentagonal, round to pointed periproct, domed to pointed, etc. Nothing stood out as being distinctly Holectypus (Coenholectypus?) engerrandi or H. (C.) adkinsi. Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted April 23, 2018 Share Posted April 23, 2018 20 minutes ago, erose said: I also have some big ones from the Kgr but still not a full 2 inches in diameter. In the Walnut at this local they come in all sizes and conditions. I have also never been able to sort out any of the other Walnut/Fredericksburg species from what I have collected over the years. I must have a hundred good specimens of all sizes from at least a dozen locals and I have laid them out and they form a perfect gray scale of small to large, round to pentagonal, round to pointed periproct, domed to pointed, etc. Nothing stood out as being distinctly Holectypus (Coenholectypus?) engerrandi or H. (C.) adkinsi. I haven't dug into that too deep, but I would think an ovatus would be easy to sort out due to proportionally huge periproct. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
gwestbrook Posted April 23, 2018 Share Posted April 23, 2018 15 hours ago, erose said: It was a beautiful day here in Austin and I decided to get a few quick hours in on some local Walnut Formation exposures. Lower Cretaceous. I think I found the largest Coenholectypus planatus I’ve ever seen. It is slightly crushed but would be a full 5 centimeters in diameter. My largest prior specimen was maybe 4cm. Tell/show me your largest of this species. Wow! That IS a big'un! And, in awesome shape too. Link to comment Share on other sites More sharing options...
FossilDAWG Posted April 23, 2018 Share Posted April 23, 2018 Don Link to comment Share on other sites More sharing options...
JohnJ Posted April 23, 2018 Share Posted April 23, 2018 Erich, you might check to see if there are different counts on the goniopores. I seem to remember that might be a distinction between Holectypus and Coenholectypus. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted April 23, 2018 Share Posted April 23, 2018 John is indeed correct. Coenholectypus has 5 and Holectypus has 4. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
erose Posted April 23, 2018 Author Share Posted April 23, 2018 2 hours ago, JohnJ said: Erich, you might check to see if there are different counts on the goniopores. I seem to remember that might be a distinction between Holectypus and Coenholectypus. 1 hour ago, Uncle Siphuncle said: John is indeed correct. Coenholectypus has 5 and Holectypus has 4. Yes, I know. They all have five. Have yet to find a true Holectypus in the Walnut. Another group of Texas echinoids in need of sorting out IMHO. Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted April 23, 2018 Share Posted April 23, 2018 21 minutes ago, erose said: Yes, I know. They all have five. Have yet to find a true Holectypus in the Walnut. Another group of Texas echinoids in need of sorting out IMHO. To be honest, I haven’t studied mine closely. Aquisition mode now, study mode in retirement. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
gwestbrook Posted April 24, 2018 Share Posted April 24, 2018 I found these two Coenholectypus in a Walnut Clay borrow pit on a ranch about 35 miles east of Abilene along the Callahan Divide in the Spring Gap area. The larger one is 5 cm across and 2.5 cm tall. The smaller one is 3.5 cm wide and 1.5 cm tall. Neither are perfect, but I'm happy with them nonetheless. Link to comment Share on other sites More sharing options...
gwestbrook Posted April 24, 2018 Share Posted April 24, 2018 A couple of days later I went to a smaller borrow pit (40' x 50'), still in the Walnut Clay, next to the road outside the fence of another ranch less than a quarter mile down the road and found this one, which I assume, since it has perforated tubercles, is a Tetragramma sp. It is 6 cm across and 2.5 cm tall. A chunk out of the side, some cracks in the test and not completely prepped, so not very pretty I'm afraid, but as in the others, I'm happy with my find. I'm waiting for the day...somewhere in the next 25 years or so..lol!...when I can purchase an air abrasion pen and compressor and do it right and coax it gently out of what's left of the matrix. I sure didn't want to try and do it manually with picks, etc., fearing I'd damage it further. So, That one small area of the Callahan Divide had some rather large specimens. Everything else I've found up and down the Divide in Callahan County has been just average in size. Link to comment Share on other sites More sharing options...
erose Posted April 24, 2018 Author Share Posted April 24, 2018 Nice echs! That is a big one for sure. The Tetragramma sp. is also a great find. I would love to get up that way and collect in the Walnut where the mix is a bit different. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted April 24, 2018 Share Posted April 24, 2018 Nice echinoids, people! I love the preservation on these. Thanks for sharing. Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
gwestbrook Posted April 24, 2018 Share Posted April 24, 2018 6 hours ago, erose said: Nice echs! That is a big one for sure. The Tetragramma sp. is also a great find. I would love to get up that way and collect in the Walnut where the mix is a bit different. Thanks! I've been trying to get time to talk to a couple of ranchers, but first I have to find their contact information. One of them is directly across the road from the original Spring Gap location in Callahan County. I'm very certain that if we could get on that place it would be untouched. The people who own the original ranch location no longer allow anyone outside deer leasees on their properties. The first time Mike and I visited that place it was untouched as well. Phymosomas, Heterasters, Selenias, Coenholectypus, Tylostomas everywhere you looked and you could fill a bag with stuff just sitting in one location. I know the other ranches would be the same. Link to comment Share on other sites More sharing options...
gwestbrook Posted April 24, 2018 Share Posted April 24, 2018 4 hours ago, Tidgy's Dad said: Nice echinoids, people! I love the preservation on these. Thanks for sharing. Thanks! I had forgotten I had some fairly nice specimens. I'm being surprised here and there as I go back through 6 years of stuff. Link to comment Share on other sites More sharing options...
RyanNREMTP Posted April 25, 2018 Share Posted April 25, 2018 Yep, those were definitely found in Texas. Link to comment Share on other sites More sharing options...
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