Coralline crag. The Coralline Crag, a Pliocene (about 4 million years old) deposit unique to Suffolk, is home to myriads of different fossils. It is a series of marine deposits found near the North Sea coast of Suffolk and characterised by bryozoan and mollusc debris. The Coralline Crag Formation is a geological formation in England. . Nov 5, 2019 · The Coralline Crag Formation is an early Pliocene marine unit up to 20 m thick occurring in Suffolk, East Anglia, eastern England. The Coralline Crag Formation is of early Pliocene age and forms a narrow outcrop between Aldeburgh and Orford on the Suffolk coast and extends offshore to the north-east for several kilometres. In 1977 Professor Richard West of Cambridge University discovered fossil pollen grains, so minute that no detail can be seen with the naked eye. Feb 2, 2017 · Whereas the Red Crag, famous for its gastropods and bivalves, takes its name from the colour of the sediment, the Coralline Crag is named for its ‘corallines’. Charlesworth (1835) first distinguished the lower division of the East Anglian Crags as the Coralline Crag, due to its high, rock-forming content of ‘corallines’, later recognized to be the skeletal remains of bryozoans. The Coralline Crag is a formation of marine skeletal carbonate sands and silty sands with an outcrop restricted to south-east Suffolk and an adjacent area of the southern North Sea (Balson, 1989, 1992a). wdiyk jotg wvt sxd rgnug orkq qdz ornr wmjq gszw