The Lower Corallian rocks of the Yorkshire coast and Hackness Hills

Summary Sections in the Lower Corallian rocks on the coast at Filey and Scarborough and in the Hackness Hills are described. Evidences of repeated intraformational erosion in the Hambleton Oolite beds at Filey are recognised and the structures known as “fucoids” occurring at the bases of many of the beds are thought to be weathered-out infillings of sun.-cracks,. The detrital quartz grains diminish in profusion and size towards the north-west, implying derivation from the east or south-east. The palaeoecology of the Hambleton Oolite Coral-Sponge reef in the Hackness Hills is discussed in relation to the faunas of the equivalent beds at Scarborough and Filey. New species of Holcospongia and Peronidella are also described.