DFW creek - November 8th

[BudB]

Last Monday, I had a dentist appointment in the morning in Dallas. I left afterward and drove a few miles west to check out a new creek. This part of the creek is mapped as Eagle Ford, but the few fossils I found all appear to have come from a red zone in the outcrop that I've never seen in an Eagle Ford area before, only Ozan. But in this part of DFW, Austin Chalk is between Eagle Ford and Ozan, and they are miles apart. I'll leave it to the experts here to tell me if this is really Eagle Ford.

 

Here are the ammonite pieces I found.

 

 

[BudB]

And these two bacculite pieces.
 

[BudB]

I liked this ammonite imprint in this rock.
 

[BudB]

And then there was this imprint. It's plainly an ammonite, but the size of its arc seems way too big for the size of the shell. Does anyone recognize this?
 

 

[BudB]

And I didn't recognize this either. The interesting texture on its outside made me pick it up.
 

 

[Al Dente]

52 minutes ago, BudB said:

And I didn't recognize this either. The interesting texture on its outside made me pick it up.

Looks like fecal pellets from some type of crustacean.

[digit]

Yup. Looks like a crustacean burrow cast. Many crustaceans strengthen the walls of their burrows (especially in softer sands and muds) by lining them with fecal pellets. This has that telltale texture.

 

 

Cheers.

 

-Ken

[historianmichael]

It looks like you stumbled into the Britton Formation. The crustacean burrow is called Ophiomorpha nodosa.

[Lone Hunter]

I found similar if not the same bacculites and first ammonite on the Trinity and a location south of there, I'm assuming both are part of Britton also.  Looks like some Metoicoceras and the imprint is likely from a heteromorph ammonite like these which came from same location.

Edited November 16, 2021 by Lone Hunter

[FossilDAWG]

I agree these look like typical Britton Formation fossils and preservation, except for the ammonite impression in photo 3.  The first are Metoicoceras as was suggested above, likely Metoicoceras geslinianum.  The baculitids are Sciponiceras gracile.  The curved ammonite is a heteromorph, Allocrioceras.  The last fossil is an Ophiomorpha, as was already suggested.  These are all typical Britton Formation finds. 

 

Don

[DPS Ammonite]

7 hours ago, BudB said:

I liked this ammonite imprint in this rock.
 

 

Collignoniceras woollgari from the Kamp Ranch Limestone which is part of the Arcadia Park Formation.
 

 

https://www.smu.edu/-/media/Site/Dedman/Academics/InstitutesCenters/ISEM/Images/Ocean-Dallas/oceandallas.pdf

[BudB]

Thanks, everyone. Guess I hadn't made it to the Britton part of Eagle Ford before.

[Lone Hunter]

If you ever go back keep an eye out for these guys, Britton is probably most notable for it's crabs but they can be hard to spot when covered in mud.

[BobWill]

On 11/15/2021 at 4:22 PM, BudB said:

And then there was this imprint. It's plainly an ammonite, but the size of its arc seems way too big for the size of the shell. Does anyone recognize this?
 

 

I would have thought this was Glyptoxoceras.

 

edit: I just noticed that it was decided this is not the Ozan so if it's the Britton then I retract my guess.

 

Edited November 22, 2021 by BobWill