Hello! I found this rock in the empty lot across the street from my house in southern Missouri (Howell County). This rock is approximately 6 inches long (15cm), and it seems very heavy for its size. I thought this rock was just another weathered rock until I noticed the indented pattern. Then I wasn't so sure. Stainless steel doesn't scratch it, and a magnet isn't attracted to it. I find a lot of crinoid stems and little gastropod fossils, along with colorful chert, in my own backyard, but it's a whole different world on top of a tall hill across the street from me. I find lots of smooth weathered rocks, and rocks that look "melted" (freeform shapes). Often there are only 2-3 of each of these strange rocks. Most of the rocks there are white and grey chert.
Well, that may be too much information, or not enough - this is my first post here. Hopefully my three photos load...
Thanks in advance for any ideas you might have! =)