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Teeth, Ammonites, and Crabs: A Day in the Upper Britton of North Texas
Aidan Campos posted a topic in Fossil Hunting Trips
On Wednesday, October 12th, I took another trip to a nearby favorite spot of mine that I found a few years ago which exposes the Sciponoceras gracile Zone, Camp Wisdom Member, Upper Britton Formation of the Eagle Ford Group here in Texas (Late Cenomanian-Early Turonian, 92-95mya), and had probably my best hunt from this site, including several different ammonites, a few shark teeth, my first Enchodus, and 26 Ferroranina dichrous crabs! First find was this very nice Yezoites delicatulus (Scaphitidae) ammonite A very worn Ptychodus sp. (Ptychodontidae) shark tooth: Sciponoceras gracile (Baculitidae) ammonite, namesake of the zone: Dead modern Procambarus steigmani — this crayfish is endemic to northeast/north central Texas: Legs of a Linuparus sp. likely L. grimmeri (Palinuridae) spiny lobster: Metoicoceras geslinianum (Acanthoceratidae) ammonite: Pair of Inoceramus capulus (Inoceramidae) bivalves: Some of the 26 total Ferroranina dichrous (Palaeocorystidae) crabs found during the day: Selenite crystals: Opuntia macrorhiza (Cactaceae), as a botanist this genus is one of my focus groups: Cameleolopha bellaplicata subsp. bellaplicata (Ostreidae) oyster occurring here as overwash from the younger Turonian Arcadia Park Formation (89-91mya) which is otherwise long since eroded away in this area: Next into some things I decided to take nice camera photos of (and consequently some of the best finds of the day) A nice tiny Cretalamna appendiculata s.l. (Otodontidae) shark tooth: My first Enchodus (Enchodontidae) fish tooth, I’m not sure which species are known from the Britton: cf. Margarites sp. (Margaritidae) gastropod, the first of this family I’ve seen in the Britton: A very beautiful Ptychodus anonymus (Ptychodontidae) shark tooth, found while crawling on the ground beneath a slope: Worthoceras vermiculus (Scaphitidae) ammonite, the nicest one I’ve collected: Natica sp. (Naticidae) gastropod, this species is extremely common in much of the Britton: Ferroranina dichrous (Palaeocorystidae) crab: My first Nannometoicoceras acceleratum (Acanthoceratidae) ammonite, fittingly tiny: Another Inoceramus capulus (Inoceramidae) bivalve: Hesperotettix speciosus (Acrididae) grasshopper: Really interesting preservation on this Ferroranina dichrous (Palaeocorystidae) crab that I had never seen before, these are almost always found in orange to dark red concretions: The total Ferroranina dichrous haul: The Nannometoicoceras acceleratum after some cleanup showing the distinctive tiny, conical umbilicus and tubercle arrangement:- 8 replies
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I found this interesting piece of pet wood some time ago in the Tarrant formation, it had eroded into a creek. Notice the ship worm holes. I was surprised it had a small part of the secondary branch still connected. Tarrant county, TX
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