Offshore both mass failure deposits and turbidites have been observed that are dated to later than 1954 from high Caesium-137 levels in the overlying sediments.
The skulls had been damaged by the weight of the overlying sediments, and some reconstruction, particularly of the lower face was necessary.
The overlying sediment will undergo compaction, causing an increase in density and therefore a decrease in buoyancy.
Subsequent erosion stripped the granite of the overlying sediments and the softer adjacent schist.
The lithostatic pressure in the rock increases due to the weight of the overlying sediment.
Later, the great weight of overlying sediment served to distort the specimen.
Over the last several million years, much of the overlying sediment has eroded away, leaving the coal seams near the surface.
The first method results in the formation of growth faults in the overlying sediment.
The grooves are most likely formed in a muddy substrate, which preserved them during deposition of the overlying sediment.
Burial continues and the weight of overlying sediments cause an increase in temperature and pressure.