Helicoprion Posted May 18, 2022 Share Posted May 18, 2022 (edited) This is a specimen I found in Ulster County, New York. A non-expert told me it is simply a chunk of concrete and that the flat, brown anomaly in the center is a leaf that got trapped inside it before it hardened. It is specifically the "leaf" which is of interest to me as I find it to somewhat resemble an invertebrate fossil. Edited May 18, 2022 by Helicoprion Link to comment Share on other sites More sharing options...
Kane Posted May 18, 2022 Share Posted May 18, 2022 Chunk of concrete seems to be the correct identification. 4 ...How to Philosophize with a Hammer Link to comment Share on other sites More sharing options...
Rockwood Posted May 18, 2022 Share Posted May 18, 2022 I can't argue with concrete. I don't see that being a leaf however. It's hard to say what that is. Link to comment Share on other sites More sharing options...
Ludwigia Posted May 18, 2022 Share Posted May 18, 2022 The photo quality is bad. Can't make out any details. 1 Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Paleorunner Posted May 18, 2022 Share Posted May 18, 2022 Seems to be one more stone in the conglomerate . 1 Link to comment Share on other sites More sharing options...
FranzBernhard Posted May 18, 2022 Share Posted May 18, 2022 46 minutes ago, Paleorunner said: Seems to be one more stone in the conglomerate. Yes!!! (Sorry, could not resist, Mods should delete it...) Franz Bernhard 1 1 Link to comment Share on other sites More sharing options...
Rockwood Posted May 18, 2022 Share Posted May 18, 2022 I think it illustrates the distinction between concrete and conglomerate nicely. The overlap in terminology is unfortunate. Link to comment Share on other sites More sharing options...
Mahnmut Posted May 18, 2022 Share Posted May 18, 2022 Hi, I tend to also call this concrete because of the matrix' color. But there are several localities for natural conglomerate in Ulster county as far as I could find: https://mrdata.usgs.gov/geology/state/fips-unit.php?code=f36111 No idea what if the colour fits with these. Best regards, J Try to learn something about everything and everything about something Thomas Henry Huxley Link to comment Share on other sites More sharing options...
Helicoprion Posted May 18, 2022 Author Share Posted May 18, 2022 3 hours ago, Mahnmut said: Hi, I tend to also call this concrete because of the matrix' color. But there are several localities for natural conglomerate in Ulster county as far as I could find: https://mrdata.usgs.gov/geology/state/fips-unit.php?code=f36111 No idea what if the colour fits with these. Best regards, J How do you distinguish natural conglomerate from concrete? Link to comment Share on other sites More sharing options...
FranzBernhard Posted May 18, 2022 Share Posted May 18, 2022 36 minutes ago, Helicoprion said: How do you distinguish natural conglomerate from concrete? Very good question! Some hints are here: Conglomerate vs. Concrete (hope link and site are working properly!) But a definitive answer is possible: If the matrix contains "cement minerals" (mainly hydrated calcium silicates etc.), than it is concrete. But this needs sophisticated mineralogical analysis, though (X-ray diffraction). Franz Bernhard 2 Link to comment Share on other sites More sharing options...
Mahnmut Posted May 18, 2022 Share Posted May 18, 2022 I dont. The included pebbles could be identical, the matrix would be the difference. I just thought the greyish matrix of your piece looks at least similar to concrete. The matrix of a natural conglomerate may be sandstone, or silicate, or carbonate, among others. Maybe looking up online pics of the natural conglomerates that occur in your region could help. Best Regards, J Try to learn something about everything and everything about something Thomas Henry Huxley Link to comment Share on other sites More sharing options...
Rockwood Posted May 18, 2022 Share Posted May 18, 2022 The milky texture of the cement (cement + aggregate is concrete) and the way some adheres to the pebbles are good indicators. 2 Link to comment Share on other sites More sharing options...
Helicoprion Posted May 18, 2022 Author Share Posted May 18, 2022 1 hour ago, Rockwood said: The milky texture of the cement (cement + aggregate is concrete) and the way some adheres to the pebbles are good indicators. Judging from that, would you say the specimen in question is concrete or a conglomerate? Link to comment Share on other sites More sharing options...
Rockwood Posted May 18, 2022 Share Posted May 18, 2022 32 minutes ago, Helicoprion said: Judging from that, would you say the specimen in question is concrete or a conglomerate? Concrete. 1 Link to comment Share on other sites More sharing options...
abyssunder Posted May 18, 2022 Share Posted May 18, 2022 (edited) I could call the specimen in questio an " agglomerate", but I could be wrong. Edited May 18, 2022 by abyssunder 1 " 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...
Rockwood Posted May 18, 2022 Share Posted May 18, 2022 Uh huh Link to comment Share on other sites More sharing options...
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