inside a large cave in limestone crock on the beach. grotto.

apennine apennines attractive bedrock big boulder calcareous cave cavern cavernous clayey clays cliff crack crag craggy crevice crustal damp dark darkness erode eroded erosion foliation formation fungus geologic geological geology grotto hollow humid humidity karstic large layer lichen limestone mildew mineral mineralogy moisture mold moss mountain natural nature plate remarkable rock sand sandy sarsen scenery sediment sedimentary shade shadow spur stone tufa weathered weathering