Including pictures from my first geological job in groundwater.
wideangle, rik041, kibs, why-yu, he-mo, metaluna, pasadena85 & atropaworkshop.
Very interesting texture!!!
@kibs It is rock hard limestone, the kind that shreds clothing, and the bottoms of shoes easily. The g pick is kind of pointing at some small solitary corals. Many of the fossils have been replaced by chert and other siliceous minerals.