G'day all, went on a trip to some old mines to collect a few rock samples. A small cylindrical rock caught my attention, it almost looked like a mini drill core but on closer inspection i could make out what seem to be ribs/ribbing on the side and small radial lines on the top and bottom. Could it be a bit of fossilized coral?
Some shots of the top and bottom
Some of the side
Some shots of the top and bottom
Some of the side