Hi!  Found this in our farmyard (Eastern South Dakota) while out rockhounding.  A coral of some sort – maybe?

Found in Sully Co SD on a field border.  Picture 2 has a men’s size 7 boot next to it for size reference.  Picture 3 (image 3727) is a close-up of part of the item.  It is possible to go get additional pictures of the item soon as snow is mostly gone if more detail is needed.  Thank you all!

Hi!  I picked this blackish rock(?) in a sunflower field in central South Dakota.  I also picked up 1 other black rock (2 total) specimen(s) on this same field which I will post in a separate post.  It is heavy for its size and has a crusty grainy texture to it.  Not magnetic (dang!).  I can attempt more pictures if requested — the light wasn’t…[Read more]

Hi!  I picked this blackish rock(?) in a sunflower field in central South Dakota.  I also picked up 1 other black rock (2) specimen on this same field which I will post in a separate post.  It is heavy for its size and has a crusty grainy texture to it.  Not magnetic (dang!).  I can attempt more pictures if requested — the light wasn’t great here…[Read more]