Ammonite Id Needed

[danco]

Here it is. 4.4 x 4.1 x1.8 cm. I'm not sure from where, possibly Texas. Thank you.

[Ludwigia]

That's a Perisphinctes with a pathology on the venter.

[danco]

Thank you Ludwigia.

[Seaforth]

Perisphinctes indeed.

i have several of those that originate from France, Poitiers area if I remember correctly

Not sure if they can be found in texas too.

In fact, I am looking at one (big Perisphinctes fella) that acts as a paperweight on my office desk

Hope this helps

cheers from overseas!

Pat

[Ptychodus04]

There's no surface exposures of Jurassic rocks in Texas. There are, I believe, a couple of small road cuts out in west Texas that hit some Jurassic sediments but from what I've read, they are very small. Not likely that this ammonite came from there.

[Ludwigia]

Wouldn't surprise me if it's from Madagascar.

[Seaforth]

Yes, looking more closely at it, and comparing it with the one I have from Madagascar, it certainly appears that way.

I had it mistaken for a Perisphinctes from France but I would place my money on Madagascar now.

[danco]

Thanks everybody. I incline also to Madagascar. My original supposition was Texas (not knowing what kind of ammo and period is) because I bought it from a Texan.

Yes, Texas is Cretaceous.

Edited December 18, 2014 by danco

[Ptychodus04]

Yes, Texas is Cretaceous.

Actually, Texas is:

Precambrian, Cambrian, Ordovician/Devonian/Mississippian Undivided, Pennsylvanian, Permian, Triassic, Cretaceous, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Holocene depending on where you look. Almost soup to nuts geologically!

[Auspex]

Actually, Texas is:

Precambrian, Cambrian, Ordovician/Devonian/Mississippian Undivided, Pennsylvanian, Permian, Triassic, Cretaceous, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Holocene depending on where you look. Almost soup to nuts geologically!

To paraphrase Aldo Leupold: "I love all Texas periods, but am in love with the Permian."

[FossilDAWG]

Actually, Texas is:

Precambrian, Cambrian, Ordovician/Devonian/Mississippian Undivided, Pennsylvanian, Permian, Triassic, Cretaceous, Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, and Holocene depending on where you look. Almost soup to nuts geologically!

All that is missing from that list is the Silurian and Jurassic. I'm pretty sure there is some Jurassic in the deep subsurface, so look for it to show up in another 50 million years or so.

Don

[izak_]

Nice specimen! You already have the answer of the species lol

[danco]

Thanks Dinoboy!