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Help needed with dry creek bed finds San Antonio, TX Thanks!


willtexas07

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Found some fossils and some partial fossils. I am pretty new at this and I am interested in trying to determine what species they are. Thanks for any input and for looking!

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Looks like you are still canvassing the Georgetown and Del Rio fms. The scallop is Neithea (I'd have to look up species). I think I see some Gryphea mucronata oysters which are known to occur in the mid to upper Del Rio, but I'm not sure of their entire range. I see a partial nautiloid that I'll tentatively call Cymatoceras. The ammonite, in my opinion, is the prize of the bunch. I don't find many planispiral ammos in the Kdr/Kgt sequence locally. Well done.

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Grüße,

Daniel A. Wöhr aus Südtexas

"To the motivated go the spoils."

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Thanks a ton Uncle Siphuncle! I can always count on you. I am very glad you are here to provide expert local knowledge to newbies like me. I have indeed been back in the Georgetown formation. It is right down the hill from my house. A 3 minute walk down the hill and I am on it. The ammonite is pretty cool. I disturbed a lot of spiders turning over rocks looking for it! What layer is your favorite to work locally? Are there any good places to access the Austin Chalk? Thanks a ton!

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I like everything except Edwards and Buda locally. There is lots of Austin from NE to western San Antonio, but it is only sporadically productive. There are a few members exposed locally, including Atco and Dessau, I believe, but there could be others. I haven't yet learned to ID members by ammonite zones. Lithology varies greatly. If you PM me where you live, I may be able to direct you to a local exposure nearby, but patience is your best tool when working the Austin. At a minimum you'll have an idea what the lithology looks like as you explore around town.

Grüße,

Daniel A. Wöhr aus Südtexas

"To the motivated go the spoils."

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