Isle of Wight Council The protruding keel of ammonites is revealed in the clay Most of the fossils from the boreholes were recovered from clay between 30m (98ft) and 90m (295ft) deep. The council ...

Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...