Here is another picture of gastropod specimen posted earlier. It is from a different vantage point. My cousin found it in the Jeffersonville Limestone of Clark County, Indiana USA and has been slowly extracting it with a sand blaster.
It appears to be a Devonian Period snail (gastropod) called Platyceras dumosum (Conrad, 1840).
Here is a spiny snail my cousin found at a road cut in Clark County, Indiana. I believe he spent about 20 hours sand blasting it to get the spines to show up.
It appears to be a Platyceras dumosum from the Devonian time period.
Here is another spiny snail found during a geology society field trip in July to a Sellersburg quarry (I think). It is embedded very well in a rock but it probably is a Platyceras dumosum from the Devonian period.
Here is a gastropod or snail from the fossil collection of Louisville's Charlie Oldham. I believe it is a Platyceras dumosum (Conrad, 1840) from the Devonian Period. I thought these creatures were somewhat rare but recently I keep seeing fossils of them. It is usually found in the Jeffersonville Limestone.