foraminiferal limestone carbonate rock in nature

background beige brown building calcite calcium carbonate cement chalk clay closeup coccolithophore collection cracked creamcolored foraminifera foraminiferal fossil geology globigerina grainy gray lime limestone macro marine material materials micrograin mineral mining natural nature ooze organic organogenic plankton porous quarry rock sedimentary sedimentology shale soft solid stone stratigraphic structure textured white yellowish