Dinodeava Posted October 8, 2018 Share Posted October 8, 2018 I found this fossil as a doorstop at a retirement home in Centennial Colorado. Could not believe it was a doorstop. The former owner had moved into the Alzheimer's unit and left it behind. No background on it AT ALL. Sorry about that. Link to comment Share on other sites More sharing options...
abyssunder Posted October 8, 2018 Share Posted October 8, 2018 Welcome to the Forum! It looks like a concretion or nodule, to me. Please wait other opinions. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Ludwigia Posted October 8, 2018 Share Posted October 8, 2018 Welcome to the Forum. I agree with Abyssunder. Concretion. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Auspex Posted October 8, 2018 Share Posted October 8, 2018 Since concretions can nucleate on decaying organic material, I enhanced the image to look for signs of such: Nothing definitive, that I can see. The bits to the right that resemble fingernail clippings are unusual, though. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Herb Posted October 8, 2018 Share Posted October 8, 2018 has an arthropodish look to me "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...
Wrangellian Posted October 8, 2018 Share Posted October 8, 2018 I see what Auspex is looking at, to the right - look like bivalves (clams) which means the concretion is from a fossiliferous environment, but I have no idea what the big black thing is! Link to comment Share on other sites More sharing options...
Plantguy Posted October 9, 2018 Share Posted October 9, 2018 Boy that is awesome looking. Any chance of getting some sharp real clear closeups for more clues? Would love to see those areas with the crescent shapes and irregular shaped segments as well as the center. thanks! Regards, Chris Link to comment Share on other sites More sharing options...
ynot Posted October 9, 2018 Share Posted October 9, 2018 The black areas edges look like a mineral stain on hackle fringe type fracturing. My guess in manganese. 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...
Dinodeava Posted October 9, 2018 Author Share Posted October 9, 2018 I will get some close pics with a metric ruler tomorrow. The black and grey both react with 6M HCl. I really appreciate all of the feedback thus far. I am a secondary science teacher with an ancient degree in Geology, and this has piqued my interest, for sure. The detail on it is really interesting. If it is a concretion, Is there any way way to extract it from the rock? I have been meticulously chipping away, but perhaps I should just leave it as is. Link to comment Share on other sites More sharing options...
RJB Posted October 9, 2018 Share Posted October 9, 2018 Interesting doorstop for sure. Concretion for sure too, but not a clue as to what that is inside? RB Link to comment Share on other sites More sharing options...
Pemphix Posted October 9, 2018 Share Posted October 9, 2018 13 hours ago, Herb said: has an arthropodish look to me That was my fist impression, too. Could be some kind of Eurypterid..... But as already said, more close-up fotos are needed... Link to comment Share on other sites More sharing options...
Aurelius Posted October 10, 2018 Share Posted October 10, 2018 Picture is indistinct, but based on what we see here, I think it's just geological, not a fossil. Link to comment Share on other sites More sharing options...
Herb Posted October 11, 2018 Share Posted October 11, 2018 lots of Mazon Creek fossils look like that picture "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...
Plantguy Posted November 14, 2018 Share Posted November 14, 2018 Hey guys, we got some more pics... Any additional thoughts?? I dont see anything more that's telling me its a fossil but I suppose since something could be hidden under that darker coating I'm not completely sure something organic couldnt have caused the original concretionary form. Still very cool! I like Tony's manganese Ideas...its interesting to hear it does fizz.. @ynot I wouldnt do anything more to it unless you have a means to chop off some of the excess weight if its too heavy to lug around....carrying it around to show makes me chuckle...I've have a 40lb+ block from kentucky and can relate to hauling around needless weight and trying to put in the car trunk nearly thru the back out. But I still have the thing. Question was raised about anyone knowing of any Denver museums/rock clubs that would be of any help for a hands on confirmation? Regards, Chris Link to comment Share on other sites More sharing options...
ynot Posted November 14, 2018 Share Posted November 14, 2018 Still looks mineral to Me. Wondering if the "fizz" was from the underlying rock or just air escaping from a porous rock. 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...
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