605dano Posted March 19 Share Posted March 19 I found these in the South Dakota Grasslands. Are they fossil corral or a type of rock formation? I have heard that sponge corral has been found in the vicinity. Link to comment Share on other sites More sharing options...
hemipristis Posted March 20 Share Posted March 20 I'm 50/50 on fossil vs mineral cluster 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
DPS Ammonite Posted March 20 Share Posted March 20 I suspect that it is chalcedony replacing another mineral, a pseudomorph. 1 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...
Jaybot Posted March 20 Share Posted March 20 Fossil or not, those are some nice rocks, great finds. 1 -Jay ''...science is eminently perfectible, and that each theory has constantly to give way to a fresh one.'' -Journey to the Center of the Earth, Jules Verne Link to comment Share on other sites More sharing options...
605dano Posted March 21 Author Share Posted March 21 Still not sure but will put them out in the rock garden. Thanks for the replies. Link to comment Share on other sites More sharing options...
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