Creek - Don Posted June 14, 2020 Share Posted June 14, 2020 Took a trip to eastern part of North Sulfur River near Cooper this afternoon. Water levels pretty low. About foot deep in most places. After walking down the bridge, I immediately noticed huge amounts of Exogyra oysters exposed everywhere. I usually find smaller ones in the past, but this time there were some huge ones that measures 6 inches across and weights 5 pounds lying on the surface. I only grabbed the ones that were less worn for my collection. There are still large amount everywhere. 16 Link to comment Share on other sites More sharing options...
FossilNerd Posted June 15, 2020 Share Posted June 15, 2020 Those are some monsters! 1 The good thing about science is that it's true whether or not you believe in it. -Neil deGrasse Tyson Everyone you will ever meet knows something you don't. -Bill Nye (The Science Guy) Link to comment Share on other sites More sharing options...
Herb Posted June 15, 2020 Share Posted June 15, 2020 nice ones! 1 "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Al Dente Posted June 15, 2020 Share Posted June 15, 2020 Looks like Exogyra ponderosa. 1 Link to comment Share on other sites More sharing options...
DPS Ammonite Posted June 15, 2020 Share Posted June 15, 2020 Some have lots of ruffles, costae. This one might be Exogyra ponderosa var. erraticostata or Exogyra erraticostata. Anyone know what the preferred name is: Exogyra ponderosa var. erraticostata or Exogyra erraticostata? 5 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
Monica Posted June 15, 2020 Share Posted June 15, 2020 Awesome oysters! 1 Link to comment Share on other sites More sharing options...
Al Dente Posted June 15, 2020 Share Posted June 15, 2020 3 hours ago, DPS Ammonite said: Some have lots of ruffles, costae. This one might be Exogyra ponderosa var. erraticostata or Exogyra erraticostata. Anyone know what the preferred name is: Exogyra ponderosa var. erraticostata or Exogyra erraticostata? Here's Stephenson's plate showing the difference between E. ponderosa and E. ponderosa var. erraticostata. The top one is the erraticostata variety. 2 Link to comment Share on other sites More sharing options...
Plax Posted June 15, 2020 Share Posted June 15, 2020 Have seen it recently listed as just erraticostata. Even in scientific literature if I'm not mistaken. Tumble an erraticostata around a bit and I think you have a regular ponderosa. Just a thought, not a fact... 1 Link to comment Share on other sites More sharing options...
Mark Kmiecik Posted June 15, 2020 Share Posted June 15, 2020 Some very nice fossils. 1 Mark. Fossil hunting is easy -- they don't run away when you shoot at them! Link to comment Share on other sites More sharing options...
DPS Ammonite Posted June 15, 2020 Share Posted June 15, 2020 7 hours ago, Plax said: Have seen it recently listed as just erraticostata. Even in scientific literature if I'm not mistaken. Tumble an erraticostata around a bit and I think you have a regular ponderosa. Just a thought, not a fact... You hit the nail in the head. I suspect that some of the Exogyras at NSR are actually worn erraticostas. Some of the Exogyras that I dug out of the rocks near the FM 2675 bridge over NSR seem to have prominent costae and are the erraticostata variety. Others are regular E. ponderosa and some are intermediate. Close examination of worn Exogyras sometimes reveal costae. I suspect that we are looking at a speciation event with many intermediate forms that lead to the creation of Exogyra costata which occurs near NSR in slightly younger Maastrician rocks. My preference is to call them all varieties of ponderosa. I attach a variety name if they are not worn. I see that Stevenson called erraticostata a variety of ponderosa since both types occurred in the same rocks and there were many intermediate forms. Attached is a photo of an Exogyra (9.5 cm) with slight costae that looks intermediate to the ponderosa and erraticostata. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
NSRhunter Posted June 15, 2020 Share Posted June 15, 2020 Yup, FM 2675 is sure good for them. That's also a better bridge for sharks teeth if you look in the gravel btw. 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