Tony Eaton Posted January 20, 2011 Share Posted January 20, 2011 (edited) Here are some thumbnails of 1-3mm teeth from POC (Turonian / Coniacian boundary) from Texas. I need to take a second look at some of the IDs, right now I'm just playing with the camera. Ischyrhiza mira (sawfish oral tooth) note the sharp crown cusp, no complete transverse ridge *corrected 1/20 9PM Texatrygon hooveri? (sawfish oral tooth) *corrected 1/20 9PM Note only a single transverse ridge, enamel folds. Ptychotrygon vermiculata (added 1/20 PM) Note multiple ridges (syn. P. triangularis) Hybodont sp? Carcharias sp? *corrected 1/23 not Scyliorhinidae (catshark) *added 1/23 image stacked for better focus Edited January 23, 2011 by Tony Eaton Link to comment Share on other sites More sharing options...
Foshunter Posted January 20, 2011 Share Posted January 20, 2011 Tony---Nice shots and enjoy looking at the tiny teeth to bad they are so hard to display.--Tom Grow Old Kicking And Screaming !!"Don't Tread On Me" Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted January 20, 2011 Share Posted January 20, 2011 Off the top of my head, look up Ptychotrygon and see if you notice similarities. Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
pleecan Posted January 20, 2011 Share Posted January 20, 2011 Very nice finds Tony and great pics! Link to comment Share on other sites More sharing options...
fossil man Posted January 20, 2011 Share Posted January 20, 2011 just curious what is the best place is best to find these micro stuff? and do you look at the fine stuff or the more gravel material Link to comment Share on other sites More sharing options...
PaleoPastels Posted January 20, 2011 Share Posted January 20, 2011 (edited) Wow! I really love those! The orange one is my favorite. I never really thought about looking for microfossils at POC, I was too busy trying to find those big teeth! XD I should give it a try next month and see if I can find some of those too! Fossil man, a sieve with very small mesh holes can pick up microfossils and I like to look in gravel areas. **BTW Tony what is the Turonian / Coniacian boundary? See, I always thought POC touched the Eagle Ford. Im still learning... Edited January 20, 2011 by Larsa Link to comment Share on other sites More sharing options...
squalicorax Posted January 21, 2011 Share Posted January 21, 2011 (edited) id look here for that info larsa the difference is the time period(turonian- Coniacian) and the stratigraphic units (eagle ford) Edited January 21, 2011 by squalicorax My Flickr Page of My Collection: http://www.flickr.com/photos/79424101@N00/sets Link to comment Share on other sites More sharing options...
Roz Posted January 21, 2011 Share Posted January 21, 2011 Very nice finds. I especially love the sawfish oral tooth. I have never seen one almost transparent like that. Is that usual? Welcome to the forum! Link to comment Share on other sites More sharing options...
tracer Posted January 21, 2011 Share Posted January 21, 2011 oh dagnabbit! i was so wanting to toss in something about the turonians and the coniacians being paleo people who lived around there! but seriously, they're ages, so now that you know that, you can go around telling others, "man! how you doin'? i haven't seen you in a coon's coniacian!" it has been previously rumored to me that the toothiliferousness of that place is due to it being where the basal austin chalk (atco contact) greets the top of the eagle ford (fish tooth conglomerate). i just keep hoping that continental drift or something is bringing it closer to me cuz i'm slowing down in my old age... Link to comment Share on other sites More sharing options...
Tony Eaton Posted January 21, 2011 Author Share Posted January 21, 2011 Thanks all! Dan, the sawfish teeth are similar to Ptychotrygon which is the most common & POC. I revised some of the IDs after reviewing elasmo.com, but I need to read further. I added a more clear cut Ptychotrygon from POC for reference too. Fossil man, I think anywhere in POC with big teeth will have small teeth. I prefer to find places that soak the conglomerate rock without much current, so that I am more likely to find teeth dissolved from the rock w/o being tumbled. I like using a mesh paper tray for sifting although I have some homemade screens too. I like to take material home and dry it off first. Then with good lighting the shinier tooth material becomes more obvious. Larsa, I mention "Turonian / Conacian" time units but I think these teeth are probably all late Turonian. The conglomerate layer with the teeth seems to be a foot or two below the Austin versus further south where it is right on the boundary. Maybe this is closer to "Taft's Fishbed Conglomerate" versus the "Atco"? Roz, I have a few translucent teeth like that, but I'd say 5% at best. Check out the Ptychotrygon I added. Tracer, yes, I guess we need more continental drift ;-) Link to comment Share on other sites More sharing options...
MikeD Posted January 21, 2011 Share Posted January 21, 2011 Nice micros, Tony. Larsa, you can find micros just about anywhere you find macros. You just have to be looking for them. I have seen electron micrographs of incredibly small shells from the Stone City formation in Texas. I never knew they were there until someone showed me. Link to comment Share on other sites More sharing options...
PaleoPastels Posted January 21, 2011 Share Posted January 21, 2011 Thank you Squal and Tony! I love learning new stuff XD Im gonna print that chart as it may come in handy! I cant wait to go back to TX in a few weeks!!! Link to comment Share on other sites More sharing options...
Hieronymus Posted January 22, 2011 Share Posted January 22, 2011 Nice teeth Tony! The hybodont is really nice. It looks a bit like Meristodonoides but since it's not complete it's hard to tell. The one you're showing has rather heavy striations on the crown. The final tooth doens't like Scyliorhinid to me. In my opinion it shows more similarities with a (para)symphyseal tooth of an Odontaspid. The translucent teeth are pretty awesome indeed http://rhaetianlorraine.webs.com/ Link to comment Share on other sites More sharing options...
Tony Eaton Posted January 23, 2011 Author Share Posted January 23, 2011 Thanks Heironymus. I agree w/ you on the catshark now that I look at some literature. Carcharias sp. A from page 91 from Welton and Farash has some similar teeth pictured although the ones pictured in "The Collector's Guide.." are a bit older from the Cenomanian. I posted some image stacked pictures of the same tooth to keep the details in better focus and therefore hopefully better show the root shape, etc. Tony Link to comment Share on other sites More sharing options...
Daniel_63 Posted February 2, 2011 Share Posted February 2, 2011 Dear Tony, Good idea "to take material home and dry it off first", but the best is to use acetic acid at 8% to dissolve the rock. Do you use this method to find little species? Link to comment Share on other sites More sharing options...
Tony Eaton Posted February 4, 2011 Author Share Posted February 4, 2011 Hi Daniel, I have some carbonate conglomerate material where I plan to try that. I plan to use 5% acetic acid (common vinegar) just because it is easy to find anywhere here in the United States. However, I am guilty of collecting a lot of rock and never getting around to dissolving it :-). I have several gallons / kilos of rock sitting around. I should have it outside in water to freeze / thaw this time of year but I haven't gotten around to that either :-) I plan to use your tip of using a sieve, and gradually collecting as the material dissolves. I have dissolved clay to collect small teeth with some success, usually with a borax based detergent, and even some drain cleaner (carefully). Link to comment Share on other sites More sharing options...
Daniel_63 Posted February 4, 2011 Share Posted February 4, 2011 Hi Tony For the clay, it is easier ; you can use detergent or hydrogen peroxide, but be careful with pyrites because it produces a heat reaction. In fact with the clay, the most important is the drying of rock and a lot of rinsing water. At the moment, I am dissolving aptian rocks. What level have you collected sharks teeth? Link to comment Share on other sites More sharing options...
Tony Eaton Posted February 5, 2011 Author Share Posted February 5, 2011 I'd love to collect the Aptian material, the oldest Cretaceous shark teeth "easy" to find are Albian though. I collect Albian to Maastrichtian, and a little bit of Carboniferous (Mississippian: Visean) shark material when I'm lucky enough to find it. The clay, (Kemp Clay) I've tried dissolving for teeth and microfossils responds well to hydrogen peroxide. The above fossils weather out of a marly conglomerate layer at least a foot thick, maybe several feet thick in places. There is no need to dissolve this rock as it is soft enough to dissolve naturally. Link to comment Share on other sites More sharing options...
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