. Bulletin of the British Museum (Natural History), Geology. 3° HAUTERIVIAN AMMONITE SIMBIRSKITES Leckenby (1859) and Judd (1868) made the first serious attempts to subdivide the Speeton Clay, but the classic description, and the one upon which all subsequent work has been based, is that of Lamplugh (1889). On the basis of the belemnite sequence Lamplugh recognized four major divisions, labelled A-D from the top. Fig. 1. Map showing the distribution of pre-Albian Lower Cretaceous rocks in East York- shire and North Lincolnshire, and the localities mentioned in the Please note that these
. Bulletin of the British Museum (Natural History), Geology. 3° HAUTERIVIAN AMMONITE SIMBIRSKITES Leckenby (1859) and Judd (1868) made the first serious attempts to subdivide the Speeton Clay, but the classic description, and the one upon which all subsequent work has been based, is that of Lamplugh (1889). On the basis of the belemnite sequence Lamplugh recognized four major divisions, labelled A-D from the top. Fig. 1. Map showing the distribution of pre-Albian Lower Cretaceous rocks in East York- shire and North Lincolnshire, and the localities mentioned in the 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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