Lithifield shell gravet 'beach rock' on Nesøya, North Norway, occurs as loose blocks and pillar-shaped in situ bodies located in and just above the present intertidal zone. Its main sedimentary constituents are skeletal fragments, mostly of molluscs and echinoderms. Quartz grains occur in considerable amounts. The cement is high magnesium calcite of marine origin. Both radiocarbon datings and fossil content show that the bioclastic constituents of the gravet were formed during the Holocene, and that the cementation
took place during the Subatlantic stage. lsostatic elevation of the gravet into the intertidal zone promoted cementation due to periodical wetting and dessication.