craigmontgomery Posted September 12, 2016 Share Posted September 12, 2016 Was out fossil hunting at Lake Benbrook, Tarrant county Texas and found this item. What is it? Crinoid stem bud, trilobite? Looks like it has eyes! Fossil Help 1.pdf Link to comment Share on other sites More sharing options...
Kane Posted September 12, 2016 Share Posted September 12, 2016 I don't think it is a trilobite. It does look like you could delicately chip away at some of the matrix to reveal more. It might be coral, but I'm not familiar with your area's geology. We'll wait for the locals to chime in on this one. I've also screen-capped it from the PDF and reduced the resolution so it can be posted here without download. 2 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Guguita2104 Posted September 12, 2016 Share Posted September 12, 2016 Hi and welcome to TFF! Try to compare it with "crinoid arms". Regards, Link to comment Share on other sites More sharing options...
Goatcabin15 Posted September 12, 2016 Share Posted September 12, 2016 don't think it.s a trilo no central spine Link to comment Share on other sites More sharing options...
Kane Posted September 12, 2016 Share Posted September 12, 2016 Ok. so I can probably rule out coral, too. The closest I can match this is to crinoid just as @Guguita says, but I'm sifting through a visual database of Texas crinoids and nothing is perfectly matching up. I've also looked through the Handbook of Texas Cretaceous Fossils (Adkins, 1928), but with no luck Segments are too numerous to be ribbing on the ventral view of an ammonite or hamite. These segmented columns have me stumped... ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
TqB Posted September 12, 2016 Share Posted September 12, 2016 Maybe the impression of a bit of ornamented bivalve such as Sphenoceramus, or Chlamys type shell? 2 Tarquin Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 12, 2016 Share Posted September 12, 2016 The rocks near Benbrook and the spillway are mostly lower Cretaceous Goodland Formation. You can rule out trilobites and probably crinoids since they are very uncommon in rocks younger than Permian. Craig, take a better close-up photo of part of the fossil to help us with an ID. Bivalves seem right now to be the best guess. Note that the radial ribs seem to converge to the lower right of the photo. Ceratostreon texanum is my best guess. The growth lines seem a little too coarse for the pectin Neithea (bottom photo) which also occurs in the area. Let's wait for some locals to chime in. 4 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
wildchild33 Posted September 14, 2016 Share Posted September 14, 2016 Think it might be a plant stem/ stalk, large variety of similar patterns. Link to comment Share on other sites More sharing options...
Sargon Posted September 14, 2016 Share Posted September 14, 2016 I'm probably wrong, but - ray pavement teeth? Link to comment Share on other sites More sharing options...
Coco Posted September 14, 2016 Share Posted September 14, 2016 Hi, Yes ! Sure ! Perhaps Myliobatis. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Ptychodus04 Posted September 15, 2016 Share Posted September 15, 2016 I think you are seeing a mold of the outside of a bivalve shell. The "matrix" on top of the ornamented section appears to be very "shelly". Regards, Kris Global Paleo Services, LLC https://globalpaleoservices.com http://instagram.com/globalpaleoservices http://instagram.com/kris.howe Link to comment Share on other sites More sharing options...
wildchild33 Posted September 15, 2016 Share Posted September 15, 2016 Calamite from Texas Link to comment Share on other sites More sharing options...
Guguita2104 Posted September 15, 2016 Share Posted September 15, 2016 Hi! Coco: Haven't myliobatids only appeared in the Late Cretaceous? Regards, 22 hours ago, Coco said: Hi, Yes ! Sure ! Perhaps Myliobatis. Coco Link to comment Share on other sites More sharing options...
Coco Posted September 15, 2016 Share Posted September 15, 2016 Hi, Oh Guguita ! I don't know (I didn't find pink emoticone...). I don't know the age of this fossil too... We have to see the other side of this mystery ! Please ! Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
abyssunder Posted September 15, 2016 Share Posted September 15, 2016 Not a trilobite, nor a Myliobatis mouth plate, I assume. There is no sepparation between the rows. The biserial crinoid arm elements are intercalated (succesive alternating layers). Also there is a continuity between the raws and an almost perfect alignment between them. I'm leaning also to a bivalve shell fragment, possibly oyster, as Tarquin (TqB) and DPS Ammonite supposed it could be. 3 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 16, 2016 Share Posted September 16, 2016 Here's another possible candidate that occurs in the Goodland Fm., Pholadomya (photo from North Texas Fossils website). Does anyone have better close-up photos of the their own Ceratostreon texanum or Pholadomya from the Goodland Fm. so that we can compare them to the photo that Abyssunder enlarged? My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
westcoast Posted September 16, 2016 Share Posted September 16, 2016 Isn't it great when we can't say for sure if a specimen is echinoderm, mollusc or fish and nobody feels bad. This is a wonderful and honest forum. Link to comment Share on other sites More sharing options...
westcoast Posted September 17, 2016 Share Posted September 17, 2016 Have a look at the top background of the recently posted images in 'funky looking fossil' post...looks very similar! Link to comment Share on other sites More sharing options...
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