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Showing results for tags 'Coenholectypus'.
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From the album: Texas Cretaceous Fossils: Echinoids
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From the album: Texas Albian (Cretaceous)
Coenholectypus planatus Albian (upper glen rose) Texas- 2 comments
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Echinoid Coenholectypus planatus Glen Rose Formation
JamieLynn posted a gallery image in Member Collections
From the album: Texas Cretaceous Fossils: Echinoids
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Texas has had SO MUCH RAIN in the last month! Mushrooms are growing where there are normally NOT mushrooms growing- but that means it has been a bonanza for fossil hunting, needless to say! If you don't mind the mud..... We have had some epic storms, too. 2+ inch hail, crazy lightning, a few tornado scares and amazing clouds. Hail from my house...my poor car. (That's a quarter for scale - 25mm) But EVERYTHING is green and the wildflowers are gorgeous this year! Havn't found anything NEW, but did a couple of nicer examples, which always makes me happy. I have found lots of Coenholectypus planatus but something is always just a little bit wrong with them - a chip in the test or a little crushed plate or too much matrix to clean easily. So I was rather excited to find this little critter. Its color is lovely and it's in great shape albeit a little water worn. Glen Rose Formation: And I was VERY happy to find a better representation of a Goniophorus scotti from the Waco Research Pit (Del Rio Formation). My first and only other one was nice and big, but was rather squished. This one is TINY and in great shape: 5 mm Hit up a new spot (Glen Rose Formation also) and found a fantastic array of Leptosalenia texanas. It was a rainy day and it was fun finding them like easter eggs amongst the rocks. Plus a nice big Heteraster texanus. Also .75 in A few more little ones from the Glen Rose Formation. Not as good as previous finds, but still nice nonetheless. The Balanocidarid spines are always a treat to find, being rather rare: And a Polydiadema travisenses: (.75 in) Found another new spot in the Walnut Formation (also SUPER muddy) that after an hour of finding huge chunks of Oxytropidoceras ammonites (I made my own.....an ammonite kit, as @erose would say) I was finally awarded a nice Tetragramma texanum: My "Ammonite" At least THREE of the pieces really do go together..... 12 inches And I found enough other pieces to "make" a second one for my mom. hahahaha!
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From the album: Texas Echinoids, ERose
This specimen appears to match the species C. ovatus which was previously known from the slightly older Glen Rose Formation. This one is from the Bee Cave Member, Walnut Formation, Fredericksburg Group, Travis County, Texas.-
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Well, I have to say, not having a full time job due to this pandemic has been extra good for my fossil hunting! I may not be making much of a living, but I'm living it up finding fossils! Fortunately, as someone pointed out to me recently "it seems like Texas is paved in fossils". While this may not be 100% accurate....it's pretty close! Within a gas tanks drive I am lucky to have MANY MANY fossil hunting spots available to me. And when November rolls around (honestly, the nicest month in Texas- mild temps and no Cedar Fever Allergies to contend with) I try to get out as much as possible. And I was rewarded for my efforts this month...BIG TIME. Some Epic Echies for the month of November! Added two new to my collection plus a few nicer examples of others. Heterosalenia (rykyrae) (Currently undescribed echinoid from the Glen Rose Formation. It is joining 3 other specimens in an upcoming research paper) (Honking my own horn here...you may have seen this first one in the Fossil of the Month contest) As found and in process of being cleaned up all pretty like! 13.5 mm As if that weren't enough for the highlight of my month, I finally got to go back to the Waco Pit Research Area (it had been closed since March and finally reopened last moth). I was lucky enough to find the TWO exact things I was looking for - a shark tooth and a Goniophorus Echinoid! Granted, it's a little crushed and wonky looking, but it's MINE. Goniophorus scotti Size: 12mm Del Rio Formation Those were my two new additions to my list of Texas Echies. The rest of these are good specimens of already found genus, Leptosalenia mexicana Size 15 mm Walnut Formation I have been trying to find a Coenholectypus ovatus (vs. planatus) but every one I have found the peristome is so covered in matrix that I cannot tell what they are. But I really loved how you can see the individual plates on this one. Size: 25mm Glen Rose Formation And just a nice little Pliotoxaster Size: 20mm Comanche Peak Formation And finally, a nice Tetragramma texanum Size: 32 mm Walnut Formation
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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.
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I have a couple of Coenholectypus from the Glen Rose which have the morphological characteristics of Coenholectypus nanus as described by Cooke, 1955. Some Cretaceous echinoids from the Americas. Geological Survey Professional Paper 264-E, page 96. In an aboral view, the periproct is clearly observed as a notch on the side of the test. It winds around the ambitus and terminates about three fourths of the way to the peristome. It is not Coenholectypus planatus. This is one of the specimens I wish to include in my book on Texas Cretadeous echinoids. However, I am just a little hesitant to classify it as Coenholectypus nanus as Cooke emphasizes that the examples from the Pawpaw rarely exceed 10 mm in diameter. This is remarkably close in size to a morphologically very similar species that Dan Woehr finds in the Boquillas. The ones I have are around 21.5 mm in diameter. Has anyone found examples in the Glen Rose that are similar in size to the ones that I have, or does anyone have a good idea as to what my examples may be if they are not C. nanus?
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Fossil Assemblage, Kcw Site 2, SE Callahan Co., Tx (Oral)
gwestbrook posted a gallery image in Member Collections
From the album: Kcw Site 2, Callahan Co., Tx
Same fossil assemblage from SE Callahan County showing Oral surfaces.-
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Fossil Assemblage, Kcw Site 2, Callahan Co., Tx (Aboral)
gwestbrook posted a gallery image in Member Collections
From the album: Kcw Site 2, Callahan Co., Tx
An assemblage of fossils found in Lower Cretaceous, Comanche/Walnut Formation at a site in SE Callahan Co., Tx. Phymosoma texana, Coenholectypus planetus?., Tetragramma sp. (all showing Aboral surfaces), Tylostoma sp.- 3 comments
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