JURASSIC FORAMINIFERAL FACIES IN THE STATFJORD AREA, NORTHERN NORTH SEA ‐ I

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Abstract
Core samples from five wells of the Statfjord area were analysed for foraminifera. The material covers the middle and upper parts of the deltaic marine Dunlin Formation and the basal deposits of the deltaic Brent Formation through an interval ranging in age from Pliensbachian to Toarcian or early Bajocian.The quantitative distribution of genera and other major faunal parameters define the following five assemblages which reflect successive steps in the evolution of the depositional basin (in ascending order): the Dentalina‐Nodosaria, Ammodiscus‐Dentalina and Marginulina assemblages developed in a delta‐influenced shelf embayment; the Trochammina‐Verneuilinoides assemblage formed under prodelta conditions; the Ammodiscus assemblage deposited in a delta‐front environment. The specific composition of the assemblages is illustrated by quantitative examples.

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