JenRho Posted June 25, 2013 Share Posted June 25, 2013 I found this near my home in the Texas Hill Country. The area is within the Balcones Escarpment. Oddly enough, it was just laying on top of the ground. All I had to do was pick it up. I need to get a Texas Fossil Handbook, but all I have at the moment is the National Audubon Society: Field Guide to Fossils. I found two fossil times that may be a match, though they are not exactly the same--Metoicoceras and Texanite. I believe my fossil is an interior mold, but I'm not sure. Thanks for helping me identify it. Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted June 25, 2013 Share Posted June 25, 2013 did you compare to mortoniceras? what town was is found nearest? good locality info narrows down possibilities fast as formations have limited aerial outcrop. 1 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
JenRho Posted June 25, 2013 Author Share Posted June 25, 2013 Hi. All I have for comparison are photos in the National Audobon Society Handbook, and the photos in the book of the two fossils I mentioned are the closest I could find to compare it to. The town I'm nearest too is San Marcos--Balcones Escarpment. Thanks! Link to comment Share on other sites More sharing options...
vertman Posted June 25, 2013 Share Posted June 25, 2013 I am pretty sure it would note be a Metoicoceras given where you found it. They also do not have a keel like your specimen (the pronounced ridge running along the outside of your specimen). Mr. Dan is probably right. It is one of the species found in the Lower Cretaceous sediments of the Texas Hill Country. Link to comment Share on other sites More sharing options...
old dead things Posted June 25, 2013 Share Posted June 25, 2013 (edited) Just for comparison here are three shots of three different metiococeras I've collected from the Frontier Formation of central Wyoming. None are prepped yet other than a quick brushing. Photo 3 does have a clear acrylic coating. Jim Old Dead Things Edited June 25, 2013 by old dead things Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted June 25, 2013 Share Posted June 25, 2013 i have personally found georgetown formation fossils including mortoniceras ammonites just north of san marcos. this is the southernmost exposure of georgetown limestone i've seen in your area as it pinches out just to the south in the san marcos arch and the re emerges well west of san antonio. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted June 25, 2013 Share Posted June 25, 2013 also, i'd guess this specimen wasnt found too far west of i-35. rocks get older fast to the west of the highway, and younger to the east. tons of mortoniceras images available online for comparison as the genus has a strong presence in washita aged strata of texas. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
JenRho Posted June 25, 2013 Author Share Posted June 25, 2013 Thanks for the info everyone. Link to comment Share on other sites More sharing options...
bone2stone Posted June 25, 2013 Share Posted June 25, 2013 also, i'd guess this specimen wasnt found too far west of i-35. rocks get older fast to the west of the highway, and younger to the east. tons of mortoniceras images available online for comparison as the genus has a strong presence in washita aged strata of texas. Check and double check. Jess B. Link to comment Share on other sites More sharing options...
JenRho Posted June 25, 2013 Author Share Posted June 25, 2013 Hi. It looks like there are a few fossils on this web page that have the same "ridge" on the top as mine does. They're marked "Mortoniceras". http://northtexasfossils.com/ammonites.htm Tarrant county, where the fossils on the above web site were discovered, is quite a bit north and east of San Marcos/Hays County. I'm a graphic designer, not a paleontologist, but could this be it? Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted June 25, 2013 Share Posted June 25, 2013 washita aged rocks outcrop in an intermittant ribbon along the balcones fault so yours wouldn't be out of line. i've found morts 350 miles north of san antonio out to 450 miles west. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
JenRho Posted June 25, 2013 Author Share Posted June 25, 2013 Thanks for the information. Link to comment Share on other sites More sharing options...
.thumb.jpg.51c371f10936bbc883322324e44cc518.jpg)
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now