the vertebrae can be found as a stray find along the beach or if you are lucky by splitting manganese carbonate “buns”.
The blocks is not washed from the clay but where transportet to the area with a glacier from Sweden and Norway. If you split one of these stones they may contain fossils like brachiopods and corals.
The crabs can be found on the beach encapsulated in the brown mangancarbonat stones. these stones can be split and often contains crabs.