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Found 19 results

  1. Hello all! I got some fun Post Oak Creek Matrix and am finding all kinds of odd things!! I am not too familiar with the stuff that comes out of POC aside from the shark teeth and crabby stuff (found a couple of nice claws!) so these things have me wondering what they are! Any help is appreciated! 1.First is this little thing: 4 mm 2. Then this weird thing 6 mm (the backside makes me think denticle but the front.....I don't know) 3. Have found quite a few of these - .I think they are some kind of dermal plates? All are aprox 3 mm
  2. Heteromorph

    T. peramplum #2

    From the album: Fauna and Flora of the Austin Group in Texas

    This Tridenticeras peramplum specimen is 2.9 cm in height, and 1.9 cm in diameter. It shows the typical three rows of tubercles on each oblique rib, except on the most mature, bottom whorl. What I can tell from my references is that this is because only the phragmocone has tubercles, and thus the bottom whorl is the living chamber.
  3. Heteromorph

    T. peramplum #1

    From the album: Fauna and Flora of the Austin Group in Texas

    This specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell. The specimen is quite crushed.
  4. Heteromorph

    T. peramplum #1

    From the album: Fauna and Flora of the Austin Group in Texas

    This specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell. The specimen is quite crushed.
  5. Heteromorph

    T. peramplum #1

    From the album: Fauna and Flora of the Austin Group in Texas

    This specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell. The specimen is quite crushed.
  6. Heteromorph

    T. peramplum #1

    From the album: Fauna and Flora of the Austin Group in Texas

    This specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell. The specimen is quite crushed.
  7. Heteromorph

    T. peramplum #1

    From the album: Fauna and Flora of the Austin Group in Texas

    This specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell. The specimen is quite crushed.
  8. Heteromorph

    T. peramplum #1

    From the album: Fauna and Flora of the Austin Group in Texas

    This specimen is the largest of its genus in my collection, and the largest known to me in any collection. It measures about 7 cm in height, and 4.3 cm in diameter. It retains its tubercles in the most mature whorl sections that are preserved well enough to tell.
  9. vellis

    Micro teeth? Not sure

    Found in Atco formation in Texas, Coniacian age. Looking in my Welton Farish book and I can’t find anything similar. Maybe spines of some sort? Kind of looks like teeth and kind of not. Lost on this one. Scale is in mm.
  10. Heteromorph

    Edwards Check Dams

    A few weeks ago my mother, Stella (dog), and I went to a old-reliable heteromorph site in the Atco. After I dragged all my equipment to the part of the site that I was going to work, she went walking with Stella to look at some of the check-dams full of brought in Edwards limestone, chicken wire bags full of the brought in matrix put in the ditches for sediment control. In 2017 while we were at the same Atco site she was looking at a dumped pile of the Edwards and found a rare cidarid (see thread here) that compares well with Temnocidaris (Stereocidaris) hudspethensis. The sight of seeing that
  11. My wife and I found five Ptychodus latissimus from the same small pocket in the Atco Member basal conglomerate in the last seven months here in Travis County, Texas USA. I am pretty proud of these finds given the rarity of the teeth.
  12. Got out for a brief 30 minute hunt in September at my favorite Basal Atco outcrop in Travis County for Ptychodus. I found a couple of rare teeth - P. latissimus! Please see pics. The largest is 26 mm tooth width (TW)) with 13 mm tooth height and 6 mm crown height. The smaller fragmented tooth is >16 mm TW. Also, at another location in August, I found a couple of nice teeth: a 23 mm TW P. mammilaris and a 16 mm TW P. mortoni. Both had complete roots for a change. Probably 90% of Atco locations around here have no or very few macro fossils except oyster/clam fragme
  13. Found this chunk of a bone with matrix attached yesterday. This was lying in the creek next to Eagle Ford/Atco Formation. About 6 x 2 inches. First thought was Mosasaur jaw bone but it also looks fishy. Any thoughts? Thanks.. Far north central Texas upper cretaceous 85-92 mya ...
  14. StevenJD

    BIG Texas Shark tooth

    From the tip of the root ( seems it may be longer, going further in the rock ) to the tip of the crown is a little over 2 1/4 inches. Dallas County, Atco Formation What say the experts?
  15. StevenJD

    Texas Cretaceous Shark Tooth ID

    Found this shark tooth in the Atco Formation, what's the species?
  16. My finds so far from the Dallas Paleo Society field trip to the Martin Marietta quarry. ( I still have a lot of matrix to break down.) IDs are based on my comparing the teeth to the best of my ability with Welton & Farish's book on fossil sharks & rays of Cretaceous Texas. A shark tooth peeking out of the matrix. I managed to fumble-finger while trying to extract it in the field, and lost the side cusp. An overview of the teeth. Top row, L to R: Unknown, Cretodus, Scapanorynchus, unknown, Cretolamna. Bottow row, L to R: Carcharias? symphyseal tooth, broken Scapanorynchus crow
  17. I found this object partially visible in a chunk of matrix from the Martin Marietta quarry near Midlothian, Texas. (Formerly the TXI quarry.) The site is listed as being basal Atco contact between the Eagle Ford shale & the Austin Chalk. The rock I found this in was Eagle Ford shale. At first I thought it might be a tooth, but on-site tentative ID was possibly brachiopod, but as the ends were buried in matrix, no one could be sure. I do note a "ridge" down one side that LOOKS almost like the worn serrated edge of a tooth, but the broken end of the piece doesn't look like tooth structure.
  18. Found this odd claw-like bit today while sorting through gravel from Post Oak Creek. Any ideas as to what this might be? Scale is in mm. Dark photo just to show scale. Both sides of the object. The best shot I could get of the "proximal" end of the thing.
  19. wfrr

    Basal Atco

    Austin Chalk/Eagle Ford Basal Atco fish conglomerate zone of North Texas On a recent outing with my 7 year old grandaughter we were at a construction site where the the basal Atco was once exposed at ground level. They had bulldozed it all and this interesting slab of flagstone was laying there. The fish conglomerate was laying about here and there where you could pick it up by the hand full and sift it for tiny teeth. She with her short close to the ground stance and fresh eyes could really spot those itty bitty teeth too. Construction exposes it then buries it. This site had produced a
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