Sjfriend Posted December 26, 2019 Share Posted December 26, 2019 Years ago bought some rock boxes from an estate sale in California. Included were some fossils I just don't know anything about. Most had vague or no IDs. The larger of these Sea Stars is approximately 6.5mm across. Gonna post a few here just to see if anything interesting although these have no connection to my collection. Link to comment Share on other sites More sharing options...
piranha Posted December 26, 2019 Share Posted December 26, 2019 Crinoid columnals: Pentacrinites 7 Link to comment Share on other sites More sharing options...
Darktooth Posted December 26, 2019 Share Posted December 26, 2019 That is a nice piece, Steve. I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
Fossildude19 Posted December 26, 2019 Share Posted December 26, 2019 Please keep any talk of trades or sale to their designated forums or the PM system. Thanks. 2 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...
Rockwood Posted December 26, 2019 Share Posted December 26, 2019 I wouldn't be surprised if they came form near Kemmerer WY. The material looks almost identical to what we collected there. Link to comment Share on other sites More sharing options...
Sjfriend Posted December 26, 2019 Author Share Posted December 26, 2019 34 minutes ago, Rockwood said: I wouldn't be surprised if they came form near Kemmerer WY. The material looks almost identical to what we collected there. It is a very hard matrix if that helps Link to comment Share on other sites More sharing options...
Rockwood Posted December 26, 2019 Share Posted December 26, 2019 1 hour ago, Sjfriend said: It is a very hard matrix if that helps Yes quite hard with an oolitic nature in many places. Here is an old photo from my collection. 3 Link to comment Share on other sites More sharing options...
Sjfriend Posted December 27, 2019 Author Share Posted December 27, 2019 On 12/26/2019 at 5:12 AM, Rockwood said: Yes quite hard with an oolitic nature in many places. Here is an old photo from my collection. That looks just like it Thanks. Link to comment Share on other sites More sharing options...
Carl Posted December 27, 2019 Share Posted December 27, 2019 Rock stars... Link to comment Share on other sites More sharing options...
Rockwood Posted December 27, 2019 Share Posted December 27, 2019 Here's the stage they preform on. There was a storm coming in and our guide George advised it was time to bug out. 3 Link to comment Share on other sites More sharing options...
Wrangellian Posted December 28, 2019 Share Posted December 28, 2019 Interesting... I was not aware that there were marine critters in Kemmerer area, though I guess if there are rays and such, there would have to be. Or are these from older strata separate from the Eocene stuff? Link to comment Share on other sites More sharing options...
Rockwood Posted December 28, 2019 Share Posted December 28, 2019 1 hour ago, Wrangellian said: from older strata separate from the Eocene stuff? Jurassic. Wyoming is one of those states. Link to comment Share on other sites More sharing options...
Rockwood Posted December 28, 2019 Share Posted December 28, 2019 1 hour ago, Wrangellian said: though I guess if there are rays and such, there would have to be. No. I'm pretty sure the Eocene lakes were fresh water. Link to comment Share on other sites More sharing options...
Wrangellian Posted December 29, 2019 Share Posted December 29, 2019 OK, that makes sense - except, how do you account for stingrays from the Eocene layers there? Did they venture into fresh water? Link to comment Share on other sites More sharing options...
Rockwood Posted December 29, 2019 Share Posted December 29, 2019 1 hour ago, Wrangellian said: OK, that makes sense - except, how do you account for stingrays from the Eocene layers there? Did they venture into fresh water? I think the must have. Salmon and eels are two examples found in both waters today. I think they claim our landlocked salmon are essentially identical to Atlantic salmon. Link to comment Share on other sites More sharing options...
grandpa Posted December 29, 2019 Share Posted December 29, 2019 2 hours ago, Wrangellian said: how do you account for stingrays from the Eocene layers there They are/were indeed freshwater stingrays. See: FRESHWATER STINGRAYS OF THE GREEN RIVER FORMATION OF WYOMING ... by MARCELO R. DE CARVALHO I also recall reading that the GRF was fresh water for the 1st 2/3rds of its existence and hyper-saline during the last 1/3. BTW there are extant freshwater rays as well. See: https://en.wikipedia.org/wiki/Giant_freshwater_stingray And: https://discusguy.com/freshwater-stingrays/ 2 Link to comment Share on other sites More sharing options...
FossilNerd Posted December 29, 2019 Share Posted December 29, 2019 43 minutes ago, grandpa said: They are/were indeed freshwater stingrays. See: FRESHWATER STINGRAYS OF THE GREEN RIVER FORMATION OF WYOMING ... by MARCELO R. DE CARVALHO I also recall reading that the GRF was fresh water for the 1st 2/3rds of its existence and hyper-saline during the last 1/3. BTW there are extant freshwater rays as well. See: https://en.wikipedia.org/wiki/Giant_freshwater_stingray And: https://discusguy.com/freshwater-stingrays/ Just to expand upon this... A lot of organisms that are commonly believed to only be found in salt water or only freshwater can actually be found in both and some are able to go between the two. Some examples beyond the freshwater stingray are below... There are some species of dolphin that only live in freshwater. The Amazon River Dolphin comes to mind. https://en.m.wikipedia.org/wiki/Iniidae Sharks of the genus Glyphis are known as River sharks for good reason, and bull sharks are known to be found in both fresh and salt water. https://en.m.wikipedia.org/wiki/River_shark Many species complete their life cycles by migrating between salt and fresh water. One of the most famous fish to do this is the salmon. Certain species of eel do this as well. Organisms that can live in different salinities are known as euryhaline. https://en.m.wikipedia.org/wiki/Euryhaline My apologies for the over usage of Wikipedia, but they were quickly accessible while I drink my coffee . They also have reference to known published works in the articles. 2 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...
Wrangellian Posted December 30, 2019 Share Posted December 30, 2019 Aha. I'm familiar with the compulsion to refer to Wikipedia, but this time I didn't even do that! Have had other things on my plate today. I am familiar with things like salmon that migrate between fresh and saltwater (and the Amazon dolphins I assumed did the same), but a completely freshwater shark is new to me! The Green River area must not have been completely landlocked, at least not for long after the closing of the Interior Seaway. I understand there are freshwater hydrozoans too. Apparently the only major phylum that is completely marine is Echinoderms, like the Isocrinids above. Link to comment Share on other sites More sharing options...
grandpa Posted December 30, 2019 Share Posted December 30, 2019 For source of lakes for the Green River Fm. see: https://en.wikipedia.org/wiki/Green_River_Formation For salinity fluctuations of the lakes see: https://en.wikipedia.org/wiki/Green_River_Formation Link to comment Share on other sites More sharing options...
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