. Bulletin of the British Museum (Natural History), Geology. MAIDEN BRADLEY - WILTSHIRE ST. 797 390 10 P. (45%) 1-2-3-9-10 A. (89 5%) 21-28-30-33 C. 16 0%) 37-47-50 NO DIAGNOSTIC MICROFAUNA R 2-3-5-9 A. 24 - 28 O LENTICULARIS recovered from this level temporary pit S. W. ot RYE HIU FARM LOWER CENOMANIAN ommonili JUKES -BROWNE & HILL. 1900 recorded by. UPPER GREENSAND with cherts Fig. 24 Microfaunal details. Maiden Bradley, Wiltshire. See Fig. 20 for explanation of letter code. cherts. The most important lithological unit is the Warminster Greensand, with its well-known Lower Cenomanian fau
. Bulletin of the British Museum (Natural History), Geology. MAIDEN BRADLEY - WILTSHIRE ST. 797 390 10 P. (45%) 1-2-3-9-10 A. (89 5%) 21-28-30-33 C. 16 0%) 37-47-50 NO DIAGNOSTIC MICROFAUNA R 2-3-5-9 A. 24 - 28 O LENTICULARIS recovered from this level temporary pit S. W. ot RYE HIU FARM LOWER CENOMANIAN ommonili JUKES -BROWNE & HILL. 1900 recorded by. UPPER GREENSAND with cherts Fig. 24 Microfaunal details. Maiden Bradley, Wiltshire. See Fig. 20 for explanation of letter code. cherts. The most important lithological unit is the Warminster Greensand, with its well-known Lower Cenomanian fauna (Jukes-Brown & Hill 1900:238). This greensand, and its lateral equivalent the Rye Hill Sand, is extremely poor in microfossils although Dr P. V. O. Drummond has presented us with a magnificent specimen of Orbitolina lenticularis (Blumenbach) washed from a temporary exposure in the greensand. In this area the underlying chert-bearing greensand has yielded no diagnostic macrofossils (Jukes-Browne & Scanes 1901, Edmunds 1938, Kennedy 1970). The age of the base of the Chalk (Zone 10) given by the microfauna appears to conflict with the ammonite dating of Kennedy (1970 : 620), who records a Lower Cenomanian fauna, probably earlier than the main saxbii assemblage fauna of south-east England. While Cenomanian sands are also present below the base of the Chalk at Knoyle Corner (ST 897307) and Melbury Down (ST 875207) (Jukes-Brown & Hill 1900: 160-161; 1903: 104-105; Mottram, Hancock & House 1956), there must be a distinct change before the River Stour is reached at Stour Bank (ST 846106). At this locality the uppermost Upper Greensand is a complex bed of glauconitized cobbles set in softer greensand. There is an abundant macrofauna of silicified and phosphatized bivalves and ammonites. The 'glauconitic marls' which overlie this bed contain a very rich phosphatized fauna (Kennedy 1970: 623) and an unphosphatized one belonging to the carcitanensis Assemblage 79. Please
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