GrandJunction Posted June 23, 2019 Share Posted June 23, 2019 A user over at mindat suggested to me that these samples might be some type of fossilized coral. I find them in western Colorado. If coral, any ideas of the specifics or a link to where I can find more information? If not coral, any idea what it might be? Thank you Link to comment Share on other sites More sharing options...
GrandJunction Posted June 23, 2019 Author Share Posted June 23, 2019 Link to comment Share on other sites More sharing options...
Rockwood Posted June 23, 2019 Share Posted June 23, 2019 I'd send this back to the geologists. I don't think coral has much of a chance. Link to comment Share on other sites More sharing options...
FranzBernhard Posted June 23, 2019 Share Posted June 23, 2019 @GrandJunction, your specimens seem to be some kind of calcite sinter or travertine. Or some fissure/cave fillings of carstified limestone. Like this example from the Paleozoic of Graz, Styria, Austria. Size is about 8 cm. They can the of highly diverse shape and color. What are the other rocks in your area? Lots of limestone there? Franz Bernhard Link to comment Share on other sites More sharing options...
DPS Ammonite Posted June 23, 2019 Share Posted June 23, 2019 What formation and age are these from? What is the rock made of, calcite, quartz? Please take a photo looking down at the columns. A Chatetes sponge is a slight possibility if certain structures are visible in new photos. 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...
Rockwood Posted June 23, 2019 Share Posted June 23, 2019 3 hours ago, GrandJunction said: western Colorado. Are there Paleozoic rocks there ? As I recall Grand Junction is in a Mesozoic area. Link to comment Share on other sites More sharing options...
ynot Posted June 23, 2019 Share Posted June 23, 2019 Looks like weathered cave flowstone (calcite) to Me. Does it fizz in vinegar? Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Rockwood Posted June 23, 2019 Share Posted June 23, 2019 Seems like I remember reading about stromatolites in the green river formation somewhere in the Douglass Pass area. I didn't have the time to look for them though. They might look like this with some weathering. Link to comment Share on other sites More sharing options...
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