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This week's adventure for Rockwood and I was to the Duck Creek formation in Tarrant county, we found gobs of gastropods, echinoids, bi valves and peices of ammonite along with unknowns. Being unfamiliar with this formation I'm having trouble with some ID's, starting with these 2. I cannot find match for the oyster, maybe the ones I was looking at were worn down so I didn't recognize it I'm not sure. The impression really has me thrown off, the piece of shell looks like it might be what made it but I don't know what it is either. Appreciate any help
- 15 replies
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- cretaceous
- duck creek formation
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Hello, I found what I believe to be a sand dollar a little over a year ago in a small creek in the DFW area in North Texas. I checked the USGS Pocket Geology on my phone and it said that the area in which I found the sand dollar in was in the Washita Group in the Cretaceous, next to some Woodbine Group members. I recently heard that sand dollars first appeared in the Eocene or Miocene or sometime in the Ice Age. But as already mentioned, I found the sand dollar in a Cretaceous area. Is it possible to find sand dollars in Cretaceous-era rock? Is it a REALLY early sand dollar? Or is it a mistake with the USGS Pocket Geology? Is this even a sand dollar? I see urchin patterns on it as well and the shape of a sand dollar, so I know it's at least an urchin of sorts. I didn't know if I should've posted this in the Id Section or another section of the forum, so I think it's appropriate to post it here, right? Please correct me if I must post this somewhere else.
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- cretaceous
- north texas
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I have numerous worm tunnels, casts, an body fossils that are all very similar from Eagle Ford, then I found the one with black squiggles that is very different, is it just the preservation that is different or is it something else? The other one is from Grayson marl which I'm not as familiar with, the rather delicate branching structure has no resemblance to the worm tunnels/fossils I'm used to finding, is it something else or different species of worm perhaps?
- 18 replies
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- cretaceous
- north texas
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I wonder if the baby shark song made outside the US, it's been stuck in my head since last night when I found the smaller of the 2 vertebra. Amazing I even spotted it, pretty sure the larger one is shark? Can anyone tell if tiny one is fish or shark? I'm trying to picture something so small, which shark could have babies so small? Could some shark vertebra be from babies still in egg sac? These were found in Eagle Ford, Cretaceous, the dark ruler is in mm.
- 6 replies
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- cretaceous
- north texas
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I've been finding lots of these small black pebbles right above the late Cretaceous gravel layer in the creeks nearby. These are very dark in color and when you strike both rocks together, it smells like sulpher. These rocks also stand out compare to other light limestone rocks in the area. Not sure where they came from or how they ended up here. Most measures around 1 inch or less / 25.4 mm. I also tried magnet test and non-magnetic.
- 5 replies
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- creataceous
- north texas
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In the few trips made to Trinity river in Tarrant county I've spotted several peices of these large whorls, I'm wondering if these are from Mariella ammonites or a heteromorph? I have found some pretty big Mariellas in Grayson marl but nothing close to this size. Is that maybe where they originate?, is the Trinity cutting through that formation? I'd love to figure that out and try to find a more complete one.
- 1 reply
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- ammonite
- cretaceous
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This was my first trip to Trinity river in Tarrant co., this section was close to borders of QT and QAL and didn't know what to expect. I certainly didn't expect to lift up rock and find a Nautiloid/Nautilus still soft in the marl. Have no idea what the marl was or how to determine age of this. Only prepped it a little afraid to mess it up. Tooth from same place and hesitant to call it bison since they're always bovid.
- 5 replies
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- 2
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- nautiloid
- north texas
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Large tooth found in Grayson marl, shame the enamel is missing, since root is not all there not positive about ID, Cretolamna? The tiny tooth missing cusp from Eagle Ford and haven't been able to find match but then I'm horrible with teeth.
- 2 replies
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- cretaceous
- north texas
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First bone is modern from Trinity river so this for the sake of learning, assuming it is a Tarsometatarsus, my question is how can you tell if bone is from waterfowl and how hard to determine bird species? The dark bone is from Cretaceous Woodbine and I'm not familiar with preservation on them, this one is funky, scratch it with fingernail and it's powdery, might be modern and hoping it's not too worn for ID. Thanks for help!
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This came from creek in Woodbine formation, hoping it can be recognized and wondering what it's attached to, bone?
- 3 replies
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- cretaceous
- north texas
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Cretaceous Eagle Ford, #1 I know it's worn and broken root but both edges are serrated, Hemipristis? #2 Both Enchodus or the smaller one possible Xiphactinus? #3 Had hard time getting details, assuming it's some kind of tooth, bony fish? Ptychodus?
- 1 reply
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- fish
- north texas
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Some things from Post Oak creek not sure if they're something or not, with exception of #3, pretty sure the one with ridges is echinoid spine and other one is fossil just don't know what. Really intrigued by whatever the yellow is, don't think it's man-made, it doesn't melt anyway.
- 12 replies
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- cretaceous
- eagle ford
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Found this in creek, Eagle Ford, at first thought it was part of gastropod but after closer inspection it started looking more like coprolite now I'm undecided so I will leave it up to the TFF court.
- 5 replies
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- 2
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- concretion
- coprolite
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Both of these from Eagle Ford Post Oak creek matrix, I didn't even recognize the tooth on first look, not sure ID is possible but curious is it very worn or just emerging or what? The other item looks like it should be something but may be ironstone, just not sure.
- 3 replies
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- cretaceous
- north texas
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Various teeth from Eagle Ford, Cretaceous, I'm a long way from recognizing teeth since I don't find them often so appreciate the education. My guess for first one would be Mako, it also looks very much like the tiny one in #3, second one I'm not sure at all and wondering what made all the marks on it? Last group I think there's an Echnodus, and cone shaped one looks like alligator or it's just wishful thinking.
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A few things from Post Oak creek, Eagle Ford. I don't have a shark tooth like this so easier to ask for ID on first one The tiny little vert I'm assuming is fish, not expecting more specific , this is the smallest one I've seen. Last item I have no idea, maybe fish related?
- 7 replies
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- cretaceous
- north texas
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These look easy enough to ID but this is just my 2nd tooth so would like to confirm I got it right, or not. Found in Post Oak creek, Cretaceous Eagle Ford.
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- cretaceous
- north texas
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This was found at same location as Rockwood's tooth, Grayson marl Washita group. I'm still getting familiar with things here and this is first tooth I've found and hopefully it's Ptychodus?
- 7 replies
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- cretaceous
- grayson marl
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The new Eagle Ford exposure in the creek we've been hunting is littered with various stages of petrified and coalified wood in the marl, Dale found a good size limb and chopped out some chunks which contained fossils. This is new to me never seen fossils in wood before, Dale has bigger pieces with bigger fossils and thinks thier some kind of boring clam like Toredo worm, but these look nothing like those to me and I want more details. These are completely shelled and how can something round and smooth bore? Dale's pieces have ones with 'balls' an inch across. On the side of big piece is 2 objects that look different, have no idea what to make of the big blob. I find this fascinating, and so cool each fossil is outlined in gold pyrite. So what are these things?
- 8 replies
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- 4
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- coalified
- cretaceous
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This particular piece of marl from Grayson caught my eye because of the little balls covering it then I saw the odd grooved chip, it's very thin and I'm not recognizing it as shell. So what are these things?
- 4 replies
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- cretaceous
- grayson
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I have usually looked for the bigger things at this site but this time focused on the small and in a different area. Didn't even realize what this was until I got home and put on my glasses and went through things, it's not in the best shape but hopefully someone can make out what it is. This was in Grayson marl Washita group.
- 7 replies
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- 1
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- cretaceous
- grayson
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Found this little guy in piece of marl I was fixing to chunk until I noticed all the little black dots. Almost have it out but decided to leave it since it's so small, hope it's enough for ID. On the flip side of tooth is another object, about same size, before I bother cleaning anymore thought I'd see if it's anything, looks like it should be Tooth was in same Eagle Ford marl as the bivalves shown.
- 1 reply
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- cretaceous
- north texas
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I've had this for a couple of years and never got around to figuring out what it is, has quartz druses all over and very heavy. Came from same creek I find most of my fossils in and no telling it's origination, have found everything from Cretaceous to Permian, and recent deposits.
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- creek find
- north texas
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This came from Eagle Ford creek where I found the shells in last post. I think I can finally tell difference in tooth vs phosphate nodule, I think
- 3 replies
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- cretaceous
- north texas
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