M. Smelror et al., JURASSIC TO CRETACEOUS STRATIGRAPHY OF SHALLOW CORES ON THE MORE BASIN MARGIN, MID-NORWAY, Norsk geologisk tidsskrift, 74(2), 1994, pp. 89-107
Four cores drilled by IKU in summer 1988 southwest of Kristiansund at
the More Basin Margin close to the Gossa High (6206/02) penetrated mar
ginal marine Lower Jurassic coarse elastic and Upper Cretaceous shelf
deposits. The lower part of the easternmost core 3 contains Lower Jura
ssic matrix-supported terrestrial conglomerates rich in mafic clasts d
eposited in an alluvial fan environment. This is succeeded by a clast-
supported, partly marine-influenced very coarse gneiss conglomerate of
Pliensbachian-Toarcian age, possibly representing fan-delta deposits.
Core 2 penetrated a similar clast-supported conglomerate below a more
sandy, partly marine influenced unit of Late Toarcian-Aalenian age. C
ore 8, further west, and the lower part of core 1 contained similar sa
ndy successions of Late Toarcian-Aalenian age deposited in a distal fa
n-delta environment. In the latter core there is a major hiatus (some
80 million years) as Upper Toarcian-Aalenian sediments are overlain by
Upper Albian Shelf deposits. The Cretaceous succession in the core co
ntained marine mudstones, sandstones and shales/claystones of Late Alb
ian to Turonian/Santonian ages. Distinct seismic reflections are prese
nt in the cored succession, but only those in the Cretaceous sequence
can confidently be tied directly to the More Basin based on the availa
ble data. A bedrock map of the More Basin Margin is presented.