Steurbaut e (5 risultati)

, 2 figs, 7 pls, 4to, wrps (WTKG) 0.0.

Close spaced sampling of 5 clay quarries in the Rupel area of Belgium and of 8 outcrop and 40 borehole sections in the Mainz Basin has led to an almost continuous foraminiferal record throughout the Middle Rupelian of the southern North Sea Basin. The distribution of foraminifera in the Boom Clay Formation is rather complex and directly related to its paleobathymetric evolution and its burial history. The exposed Boom Clay section studied here (Beds 1 to 55) can be subdivided in four major intervals, in which nine foraminiferal biofacies can be identified. Comparison with the foraminifera of the "Rupelton" in the Mainz Basin allows to equate the boundary between the "Foraminiferenmergel (FM)" and the "Fischschiefer (FS)" with the Terhagen Clay/Putte Clay boundary, the FM 2/FM 3 boundary with the base of pink layer Bed 21 and the FS A/FS B boundary with the base of the double band (Bed 39). The major changes in lithofacies and in foraminiferal associations reflect substantial changes in circulation in the southern North Sea Basin, due to eustatic sea-level changes and to the closure of marine pathways, related to uplift in the Alpine Foldbelt. 12 pp., 5 figs, 4.…

35 pp., num. figs, 2 pls, stapled 4.

60 pp., num. figs, stapled 4.