. Bollettino del Museo Britannico di storia naturale), la geologia. CENOMANIAN BRACHIOPODI dal gesso INFERIORE DELLA GRAN BRETAGNA E DEL NORD EUROPA 77. La sezione sulla scogliera a Hunstanton, Norfolk, per mostrare i letti A, B e C della roccia rossa, il letto Inoceramus e la pietra Totternhoe. dentatus zona del Medio Albian e termina a letto 19 alla sommità della zona dispar della tomaia Albian. Brachiopodi si verificano in letti da 13 a 16 dove la fauna è dominato dal MOU- tonithyris dutempleana, Orbirhynchia parkinsoni e Kingena spinulosa, specie che sono indi- genous nei letti basale del Cambridge Greensand, considerato

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. Bulletin of the British Museum (Natural History), Geology. CENOMANIAN BRACHIOPODS FROM LOWER CHALK OF BRITAIN AND NORTH EUROPE 77. The cliff section at Hunstanton, Norfolk, to show Beds A, B, and C of the Red Rock, the Inoceramus Bed and the Totternhoe Stone. dentatus Zone of the Middle Albian and ends at Bed 19 at the top of the dispar Zone of the Upper Albian. Brachiopods occur in Beds 13 to 16 where the fauna is dominated by Mou- tonithyris dutempleana, Orbirhynchia parkinsoni and Kingena spinulosa, species which are indi- genous in the basal beds of the Cambridge Greensand, considered to be of Lower Cenomanian age. These beds are condensed and only a few metres thick at Hunstanton, and correlation with the much thicker succession in Lincolnshire and Yorkshire is difficult (Morter & Wood 1983). The hard bands of consolidated limestone known as the 'Paradoxica' Bed, chalkstone with a hardground, and the Inoceramus Beds, marls rich in bioclastic debris, are clearly visible above the Red Rock at Hunstanton (Fig. 6). They contain a varied brachiopod fauna of Ornatothyris spp., O. pentagonalis, Concinnithyris sp. and Kingena concinna. North-east England The paucity of ammonites in the Cenomanian of Lincolnshire, Humberside and North York- shire has made direct correlation with beds of equivalent age in southern England very difficult. Certain well-marked lithological horizons have been recognized, however, and can be equated with beds in eastern and southern England. Brachiopod faunas in these lithological bands have become more important since Bower & Farmery (1910), Jefferies (1963) and Jeans (1973) indicated brachiopod bands which appear to be common to both northern and southern areas. Bower & Farmery (1910) established a numerical system for the beds in the Lower Chalk of Lincolnshire which was broadly applicable to the entire northern province. Their Bed I com- prised the 'Paradoxica' Bed and the two Inoceramus Beds. Between these and the Grey Bed

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