(Table 1) Distribution of ostracods in Jurassic sediments of DSDP Hole 79-547

Eighteen samples from the Early Jurassic (Hettangian to Pliensbachian) and nine from the Bajocian to Berriasian interval have been examined. The ostracode fauna has been left largely in open nomenclature pending a more detailed study. At least four new genera, listed simply as Gen. nov. A-D sp. nov. have been recognized. Although many new species are present, there is a similarity between this ostracode fauna and that of northwest Europe of comparable age. This is particularly true for the Early Jurassic from which Bairdia guttulae Herrig, 1979, Ptychobairdia cf. aselfingenensis (Lord and Moorley, 1974), Monoceratina scrobiculata Triebel and Bartenstein, 1938, Bairdia sp. 4134 Michelsen, 1975, Ogmoconcha cf. contractula Triebel, 1941, and Paracypris cf. redcarensis Blake, 1876 have been obtained. Monoceratina vulsa (Jones and Sherborn, 1888), present in the Toarcian to Callovian of Britain, is recorded here from a sample provisionally dated as Bajocian to Callovian on foraminiferal evidence. The more important species are illustrated and their distribution recorded in Table 1.

Geochemistry and K-Ar dates of the Mazagan granodiorite at V30-225, VA79-96KD and DSDP Hole 79-544A, off Moroccan coast

Gneissic granodiorite was recovered by drilling at the base of the Mazagan escarpment, 100 km west of the Casablanca, Morocco, at 4000 m water depth. Coarse, predeformative muscovite yielded dates of -515 Ma, fine-grained muscovite of -455 Ma, biotite -360 and 335 Ma, and feldspar -315 Ma. These dates are tentatively correlated with the microscopic results. We assume a minimum age of middle Cambrian for the granodiorite, an Ordovician deformation and mylonitization, and a Late Carboniferous overprint under upper greenschist facies conditions.

Table 6 Generalised properties of Utsira caprocks, based on analysis of cuttings (page 79)

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