. Bulletin of the British Museum (Natural History), Geology. CENOMANIAN BRACHIOPODS FROM LOWER CHALK OF BRITAIN AND NORTH EUROPE 79 (1958a, b, 1971), Hancock (1961), Fletcher (1977) and Fletcher & Wood (1983). The sediments consist of two main stratigraphical units, the Hibernian Greensand (Cenomanian to Middle Santonian) and the Ulster White Limestone (Santonian to Maastrichtian). The Hibernian Greensand includes the Belfast Marls (a new name by Fletcher & Wood, 1982, for the Giauco- nite Sands) which are of Mantelliceras mantelli Zone age. This unit yields brachiopods in the Island M
. Bulletin of the British Museum (Natural History), Geology. CENOMANIAN BRACHIOPODS FROM LOWER CHALK OF BRITAIN AND NORTH EUROPE 79 (1958a, b, 1971), Hancock (1961), Fletcher (1977) and Fletcher & Wood (1983). The sediments consist of two main stratigraphical units, the Hibernian Greensand (Cenomanian to Middle Santonian) and the Ulster White Limestone (Santonian to Maastrichtian). The Hibernian Greensand includes the Belfast Marls (a new name by Fletcher & Wood, 1982, for the Giauco- nite Sands) which are of Mantelliceras mantelli Zone age. This unit yields brachiopods in the Island Magee area, including Cyclothyris sp., Orbirhynchia sp., Capillithyris squamosa and indeterminate Terebratulidae. The brachiopod fauna has never been adequately investigated and is in need of revision. The succeeding Island Magee Siltstone Member (Fletcher & Wood 1982) consists of grey argillaceous sandstones with hard calcareous bands, and is of upper Acanthoceras rhotoma- gense Zone age. It is followed non-sequentially by the Colinwell Sands, in which brachiopods are fairly common, but are not identifiable, and are again in need of revision. Northern France At Cap Blanc Nez in the Boulonnais the succession is much the same as at Dover and Folkestone, and the Lower Chalk, although somewhat more compact, contains an identical brachiopod fauna. Amedro et al. (1976, 1978) divided this part of the succession into ten parts, with a letter and a numeral, C-L and 1-27, to denote its position in the top of the Albian and Beauvais. X Tournai « Mons >. > Troyes Calais < Tours mkh ^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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