Hatchet Posted August 19, 2018 Share Posted August 19, 2018 Hi, i have found these fossils at eocene marl layers, and i cant identify them. First one looks unfamiliar to me, second one could be oyster or some form of coral maybe but im not sure. Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted August 19, 2018 Share Posted August 19, 2018 I think the first one is an echinoid which has been broken or covered in interesting calcite crystal formations. The second one is indeed a coral. 6 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Hatchet Posted August 19, 2018 Author Share Posted August 19, 2018 19 minutes ago, Tidgy's Dad said: I think the first one is an echinoid which has been broken or covered in interesting calcite crystal formations. The second one is indeed a coral. Thanks, can you name the type of coral ? Link to comment Share on other sites More sharing options...
Tidgy's Dad Posted August 19, 2018 Share Posted August 19, 2018 It's scleractinian, but to get much closer than that you'd need the precise locality and formation and probably a polished cross-section or acetate peel. They are notoriously hard to id. 3 Life's Good! Tortoise Friend. Link to comment Share on other sites More sharing options...
Innocentx Posted August 19, 2018 Share Posted August 19, 2018 The first one looks very much like fractured chert, interesting configuration. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
ynot Posted August 19, 2018 Share Posted August 19, 2018 7 minutes ago, Innocentx said: first one looks very much like fractured chert, Chert has a conchoidal fracture, this piece shows well defined cleavage. It is probably calcite. 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...
Innocentx Posted August 19, 2018 Share Posted August 19, 2018 1 hour ago, ynot said: It is probably calcite. And you are most likely correct. 2 hours ago, Innocentx said: looks very much like chert from my locale, which doesn't necessarily fracture conchoidally. Example... "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
DPS Ammonite Posted August 19, 2018 Share Posted August 19, 2018 6 minutes ago, Innocentx said: And you are most likely correct. chert from my locale, which doesn't necessarily fracture conchoidally. Example... In between some stained (open?) fractures, I see conchoidal fractures that suggest that it is chert. 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...
ynot Posted August 19, 2018 Share Posted August 19, 2018 30 minutes ago, Innocentx said: which doesn't necessarily fracture conchoidally. Example... All of the fractures I see in this rock exhibit conchoidal fracture. Just need to look at the shape in a smaller scale There can be impurities and non quartz inclusions in cryptocrystalline quartz that will have an effect on how the piece will brake. Multiple cracks from previous hits can have an effect on the way a rock will fracture also. 1 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...
Innocentx Posted August 19, 2018 Share Posted August 19, 2018 Apparently I'll have to re-understand the definition of conchoidal. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
ynot Posted August 19, 2018 Share Posted August 19, 2018 21 minutes ago, Innocentx said: Apparently I'll have to re-understand the definition of conchoidal. denoting a type of fracture in a solid (such as flint or quartz) that results in a smooth rounded surface resembling the shape of a scallop shell. Size does not matter, the fracture can be a pinhead size or 3 feet across. 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...
Innocentx Posted August 20, 2018 Share Posted August 20, 2018 55 minutes ago, ynot said: a smooth rounded surface resembling the shape of a scallop shell I'm not always seeing the rounded part, I guess. "Journey through a universe ablaze with changes" Phil Ochs Link to comment Share on other sites More sharing options...
ynot Posted August 20, 2018 Share Posted August 20, 2018 6 minutes ago, Innocentx said: I'm not always seeing the rounded part, I guess. They can appear flat at times. 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...
HansTheLoser Posted August 26, 2018 Share Posted August 26, 2018 The coral in the initial post is called Hydnophyllia, but this is only a label since Eocene corals were almost never examined using thin sections, on a global scale, up to now. 1 Link to comment Share on other sites More sharing options...
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