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The Early Cretaceous (probably Berriasian – Valanginian) Whitchurch Sands Formation of Oxfordshire and Buckinghamshire, English South Midlands, was deposited as coastal-marine and alluvial sediment along the northern edge of the Wessex Basin. The type succession at Whitchurch in Buckinghamshire includes a marine horizon, probably of Berriasian age. Alluvial sediments dominate the formation elsewhere and are tentatively linked to mid-Valanginian uplift of the nearby London – Brabant Massif. The Valanginian alluvial plain is thought to have bordered a coastal lagoon and barrier complex, accounting for non-marine faunas in the Whitchurch Sands Formation, and limiting seawater influx into the Weald Basin of south-east England, from a South Midlands seaway. Detrital and palaeobiological data from the Whitchurch Sands Formation and type Wealden (Weald Basin) suggests a connection between the seaway and the East Midlands Shelf, through much or all of the Valanginian – early Aptian interval. |
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