Zenmaster6 Posted February 20, 2021 Share Posted February 20, 2021 Glen Rose Formation 105 - 115 MYA Found in Roadcut near north San Antonio I know its not great quality but from just this, is this an ammonite and if so, is it possible to narrow it to a species? Link to comment Share on other sites More sharing options...
Thomas.Dodson Posted February 21, 2021 Share Posted February 21, 2021 It is an ammonite but I wouldn't expect a species from it. There's lots of species within single genera in the Glen Rose Formation according to Texas Cretaceous Ammonites and Nautiloids and specific identification usually requires something more substantial in these situations. Getting it to genus might be possible. Can we get other angles? 1 Link to comment Share on other sites More sharing options...
Planko Posted February 21, 2021 Share Posted February 21, 2021 Oyster of some sort I would guess. 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 21, 2021 Share Posted February 21, 2021 More pictures needed. Other sides, top, bottom. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Thecosmilia Trichitoma Posted February 21, 2021 Share Posted February 21, 2021 The shape and pattern are making me think oyster too. More images will help. 1 It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt -Mark Twain Link to comment Share on other sites More sharing options...
Thecosmilia Trichitoma Posted February 21, 2021 Share Posted February 21, 2021 An image of the sides of the fossil will determine if it is oyster or ammonite. 1 It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt -Mark Twain Link to comment Share on other sites More sharing options...
JamieLynn Posted February 21, 2021 Share Posted February 21, 2021 Looks to be a bivalve common in the Glen Rose called Trigonia. They have that same striation pattern as an ammonite and look "kind of" like a fortune cookie in shape. 2 2 www.fossil-quest.com Link to comment Share on other sites More sharing options...
Crusty_Crab Posted February 21, 2021 Share Posted February 21, 2021 For reference, this is Pterotrigonia klamathonia, in unprepped form: And after preparation: 2 1 Link to comment Share on other sites More sharing options...
Zenmaster6 Posted February 21, 2021 Author Share Posted February 21, 2021 Oyster, Trigonia, Ammonite. Now I'm really confused. I'll need to upload more photos when I get home Thanks everyone for commenting! Link to comment Share on other sites More sharing options...
JamieLynn Posted February 21, 2021 Share Posted February 21, 2021 @Zenmaster6 ammonites are very uncommon in the Glen Rose, And the ones that are sometimes found there do not look like this. As for oyster, yes, there are some that have striations, but they also almost always have the shell intact, so they have a smooth usually grey or yellowish surface. I have collected many many just like your specimen and it is a Trigonia bivalve, probably a whitneyi. Here is a link to my little website (specifically the Glen Rose Formation page) so you can see some examples of what all I have found there and do some comparisons. https://www.fossil-quest.com/central-texas-fossils/formation-glen-rose 1 1 www.fossil-quest.com Link to comment Share on other sites More sharing options...
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