The effect of environmental change on early Aptian ostracods faunas in the Wessex Basin, southern England

Abstract

A major phase of transgression in the Wessex Basin (southern England) during the earliest Aptian resulted in the collapse of the generally fresh water Barremian environment and the initiation of the marine mileu.Cypridea-rich faunas low in the Shepherd's Chine Member (Vectis Formation), were gradually replaced by faunas dominated by Sternbergella cornigera, Mantelliana mantelli and Theriosynoecum fittoni. This change is interpreted as indicating that salinities had passed from fresh-oligohaline to meso-and pliohaline and that ephemoral water bodies were replaced by more widespread, permanent, lagoonal waters. The ostracods from the highest part of the Vectis Formation, appear to be heralding the major transgression that was about to engulf the Wessex Basin.

Total organic carbon and pyrolysis analysis of the Lower Cretaceous in Compton Bay and Atherfield, Isle of Wight (England)

“…In Atherfield, sampling was focused on the Atherfield Clay Formation (Table 1). Below is a succinct description of the studied lithostratigraphic units in the Isle of Wight based on previously published works (Casey, 1961;Owen, 1975;Batten, 1982;Batten, 1994, 1990;Ruffell and Wach, 1991, 1998b, 1998aStewart et al, 1991;Wach, 1991;Wach and Ruffell, 1991;Harding and Allen, 1995;Gröcke et al, 1999;Gröcke, 2002;Robinson and Hesselbo, 2004;Wilkinson, 2008;Hopson et al, 2008Hopson et al, , 2011.…”

Integrated stratigraphy of the Upper Barremian–Aptian sediments from the south-eastern Crimea

“…S4, Table S3). The species composition of Lower Cretaceous ostracod assemblages of Crimea appears to be affected by a marked endemism and thus none of the proposed zonations (Neale 1978;Wilkinson & Morter 1981;Damotte et al 1981;Babinot et al 1985;Lott et al 1985Lott et al , 1986Wilkinson 1988Wilkinson , 2008Vivers et al 2000;Woods et al 2001;Coimbra et al 2002;Bachmann et al 2003) can be applied in this area. Nevertheless, the recent study of ostracod stratigraphic distribution in the upper Barremian-Aptian sediments of the SW Crimea enabled the recognition of several correlative ostracod Zones (Karpuk 2016 b;Brovina et al 2017), which were also found in the Zavodskaya Balka section.…”