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Post Oak Creek

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Post Oak Creek

Fossils found in Post Oak Creek, and in nearby creeks in Sherman, TX. 

 

The Cretaceous fossils are washed out of the Eagle Ford Group (~ 90 Ma), and mammal material from the Pleistocene or younger.

 

Vertebrate Faunal List (work in progress):

 

Rarity (purely subjective):

Abundant, Common, Uncommon, Rare, Ultra-Rare

Sharks:

Cantioscyllium sp. ('bamboo shark')*

  • Cantioscyllium decipiens

Chiloscyllium sp. ('bamboo shark')*

  • Chiloscyllium greeni

Cretodus sp.

Cretorectolobus sp. ('carpet shark)*

Cretalamna sp.

Cretoxyrhina sp. ('ginsu shark')

  • Cretoxyrhina mantelli

?Galeorhinus sp. ('tope shark')*

cf. Ginglymostoma sp. ('nurse shark')*

Lonchidion sp. ('Hybodont shark')*

Meristodonoides sp. ('Hybodont shark')*

Pseudocorax sp. ('False-crow shark')

Ptychodus spp. ('crusher shark')

  • Ptychodus anonymus
  • Ptychodus atcoensis
  • Ptychodus mortoni 
  • Ptychodus whipplei

Scapanorhynchus spp. ('goblin shark')

  • Scapanorhynchus raphiodon
  • Scapanorhynchus texanus

Squalicorax spp. ('crow shark')

  • Squalicorax falcatus
  • Squalicorax kaupi

Fish:

Amiidae indet.*

Enchodus sp. ('saber-toothed herring')*

Ischyrhiza sp. ('sawskate')*

Pseudohypolophus sp. ('guitarfish')*

  • Pseudohypolophus mcnultyi

Ptychotrygon spp. ('sawskate')*

  • Ptychotrygon slaughteri
  • Ptychotrygon texana
  • Ptychotrygon triangularis

Pyncodontiformes

Rhinobatos spp. ('guitarfish')*

  • Rhinobatos caseiri
  • Rhinobatos incertus

Reptile:

?Coniasaurus crassidens*

Mosasauridae

 

* micro-vertebrate - should use/need magnification to find

 

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4 Album Comments

facehugger

Jealous. Been far too long since I have been in a north Texas creek...

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CAT B

How exciting! I brought home a bucket of about 5 lbs of gravel matrix from POC just before the Covid-19 “lock-down” here in Dallas. Been going thru a few scoops full every evening. (So relaxing to “hunt fossils” from the ease & comfort of one’s own patio! lol) After sifting it by size, I search thru each subset. But, I’ve been saving the bag of “super-fines” (particles under about 1 mm) to inspect more closely once I get a decent magnifying glass. (A loupe is just too small to use for so many particles!) Already found some really neat tiny sharks teeth looking ones just searching with my 3.50-power reading glasses. FWIW, I average about 10-15 whole teeth (under 1 cm) per half pound of matrix I’d say. Add in 3-4 “large” teeth (over 1 cm) per pound for the “first sift” layer (stuff not making it thru the 1/2” mesh). Those have tended to be rather hefty / chunky ones too. I probably should start keeping better (well, any) records of the finds by layer & wt of each layer, but I’ve been lazy plus I can’t imagine what I’d do with the resultant data anyhow. Maybe post it here? Best part is the number of tiny fish vertebrae I’ve found this way. Anyhow, cheap thrills while socially distant, I guess.

Happy hunting, stay safe, everyone! 

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  • Image Comments

    • Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

      By Barrelcactusaddict · Posted

      Correction (May 6, 2024):
       
      I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
       
      Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.
    • Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

      By Barrelcactusaddict · Posted

      Correction (May 6, 2024):
       
      I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
       
      Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.
    • Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

      By Barrelcactusaddict · Posted

      Correction (May 6, 2024):
       
      I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
       
      Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.
    • Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

      By Barrelcactusaddict · Posted

      Correction (May 6, 2024):
       
      I would more accurately list the insects in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
       
      Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.
    • Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

      By Barrelcactusaddict · Posted

      Correction (May 6, 2024):
       
      I would more accurately list the inclusions (workers and alates) in this piece as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
       
      Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.
    • Sumatra Blue Amber (Sinamar Fm., ~30 Ma)

      By Barrelcactusaddict · Posted

      Correction (May 6, 2024):
       
      I would more accurately list this specimen as being within the Pseudomyrmecini tribe; modern distribution of its members would possibly suggest a Tetraponera sp. rather than Pseudomeyrmex.
       
      Also, after conferring with the seller of the amber itself, this material was mined from lignite deposits associated with the Gumai, Air Benakat, and Muara Enim Formations of the South Sumatra Basin: these range in age from 30-6.3 Ma.
    • Claiborne Amber (Cockfield Fm., 41.3-38 Ma)

      By Barrelcactusaddict · Posted

      Sorry for my late response. That's a good observation. The Cockfield Fm. that hosts this amber belongs to the Claiborne Group, which encompasses a great number of different Formations.
    • My First Peripristis sp. Tooth

      By Samurai · Posted

      Thats the fun thing! the Iola formation as a whole is severly lacking in reported online material, infact the only good source is the KGS website, an old website, and finds reported by @Missourian. 
       
      Here is the website showing the teeth from the Raytown including a similar looking Peripristis. Sadly the locations on google Earth were not mentioned so I could go and see the Iola formation in a sequence instead of an abandoned rockpile.
       
      https://inyo2.coffeecup.com/kansasfossils/kansasfossils.html
       
      Eventhough the spot I hunt is a jumbled rockpile, I know its raytown due to the lithology descriptions listed here, the "Calico" appearance, and other fauna indicators that are listed on the KGS site. 
       
      https://www.kgs.ku.edu/General/Geology/Johnson/05_outcr.html
       
      The Muncie Creek is present via phosphate nodules being reworked into the Paola Limestone but the shale itself is gone. Ive also found the described Conulariids in the Paola Ls that are on my other album. This at least proves its one of those formations, if there is any doubt. I have not found a nodule in the Raytown so its easier to know which layer is which at the site.
       
      Ive also found some fossils not listed on the website from the Raytown such as scarce fish bones and some carbon? chunks. Here are some images I took a while ago.

      Carbon?

       

       
      Fish teeth and Very scarce fish bones are not restricted to the Raytown as ive rarely found them in the thicker Paola strata and somewhat more commonly in the Muncie Phosphate nodules but thats off topic. 
    • My First Peripristis sp. Tooth

      By Collector9658 · Posted

      The second tooth looks alot like Peripristis, I agree. I still am uncertain about the first tooth, I agree more prep would help. Have you checked to see if Peripristis is reported from those deposits?
    • My First Peripristis sp. Tooth

      By Samurai · Posted

      I was thinking so, but I could be wrong. I based it off of this website here but I couldnt find any teeth that closely matched. I still think this is some sort of petalodont if not peripristis. 
      https://www.ammonit.ru/foto/30996.htm
       
      Here are some close ups I tried to take but Prepping this will need to be done to expose more. 
       

       
      I also based it off my other True Peripristis tooth I found a couple weeks ago near the Missouri Iowa boarder. I assumed the specimen pictured above was the opposite side showing. 
       
      other tooth:

       
       
      If you have any idea of what the assumed Peripristis tooth is let me know as I want to learn more. 
       
       

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