Contributions to Zoology, 72 (2/3) (2003)Christian Neumann; John W.M. Jagt: A ?carcineretid crab from Lower Turonian (Cretaceous) black shales of Misburg, Hannover area (Germany)

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Exposed formerly at the disused Hannoversche Portland Cementfabrik AG (HPCF II) quarry, east of Misburg, topographical map TK 25, sheet 3625 Lehrte, co-ordinates R – 3559120, H – 5806320, situated in the Kronsberg syncline east of Hannover, were marls and limestones of Early Cenomanian (dixoni Zone) to the basal conica/papillosa Zone of Early Campanian age, with a major hiatus comprising the upper Middle Turonian to the uppermost Coniacian (Ernst et al., 1997; see also Wood & Ernst, 1998).

The black shale succession across the Cenomanian-Turonian boundary has been the subject of detailed studies (for a review see Hilbrecht & Dahmer, 1994). Black shales intercalate with white limestones (the so-called ‘Schwarz-weisse Wechselfolge’) and may be subdivided into a lower member (Upper Cenomanian), a middle or ‘major’ member (Lower Turonian) and an upper member (upper Lower Turonian), in which black shale beds become thinner. The laminated marls contain only up to to 1-3% Corg, which means they are not ‘black shales’ sensu stricto, and contain mainly inoceramid bivalves and ammonites, including Neocardioceras juddii, Thomelites sp. and abundant Sciponoceras, as well as well-preserved fish remains (Kriwet & Gloy, 1995). Ernst et al. (1997, p. 81) referred to this find from one of the several black shale levels in the ‘Major Black Shale belt’ of the Lower Turonian (see their fig. 56), interpreted as a basin facies.