rock cave

alcove bay bed bedrock booty britain cave cavernous cavity cliff coast coastal composition contraband cornwall course crust england english erosion face fault faulting fissure fold folding geological geology grotto hollow inorganic landform layer limestone matter mineral niche north pattern pirate rock rockface sale sandstone scar scrag sediment shale shelter sheltered shore slate small smuggler smuggling strata stratified stratum substratum texture underlayer