Benthic palaeoecology of the Late Jurassic Kimmeridge Clay by Paul Wignall

By Paul Wignall

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Subassociation E2b is the most diverse (H = 1-3) and represents the most inhabitable benthic conditions indicated by this association. E3 Protocardia morinica: Quadrinervus ornatus Association (15 samples, 1082 specimens, 33 species, 21 % average fragmentation, H = 1-55) This is one of the most diverse of the dysaerobic associations, with a variety of trophic feeding groups represented (text-fig. 24). The association occurs in mudstones of the upper eudoxus Zone (text-fig. 5) and the hudlestoni Zone (text-figs 8 and 9) where authigenic uranium values do not exceed 2 ppm.

This is probably responsible for the high levels of fragmentation. WIGNALL: KIMMERIDGE CLAY BENTHIC PALAEOECOLOGY 45 20 33. Trophic nucleus of B3, the Trautscholdia phillis: Corbulomima suprajurensis association from calcareous mudstones andfissileshales of the upper pallasioides Zone near Chapmans Pool. Key: 1, Liostrea multiformis; 2, Protocardia morinica; 3, Trautscholdia phillis; 4, Corbulomima suprajurensis; 5, Grammatodon longipunctata; 6, Balanocrinus subteres; 7, Pseudolimea multicostata; 8, Isocyprina minuscula; 9, Plagioglypta sp.

The more proximal Swindon sediments contain a higher proportion of silty and sandy horizons. A14 Corbulomima suprajurensis: Neocrassina ovata Association (243 specimens, 18 species, 24% average fragmentation, H = 2-34) This association occurs at three levels in the topmost cymodoce and lower mutabilis Zones at Swindon where it is found in mudstones and slightly organic-rich shales (text-fig. 41). Like many WIGNALL: KIMMERIDGE CLAY BENTHIC 54 IA1AJ A6 16 A14 PALAEOECOLOGY 70 A15 A1 15 100 A4 33 75 A14 32 A1 common Deltoideum 7&J = Black Head Siltstone 81HA11 8 10HA3 t-i O o 6 A13 30 oil shales removed [&MVirgula Limestone 29 110 A1 ft / A13 115' *

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