Abstract
Several lithological units of the Silurian Peary Land Group show a remarkable continuity along the E-W trending basin axis, but pronounced lateral facies changes occur N-S across the basin. An approximately 4000 m thick sequence of turbidites to the north in the deep-water basin represents the time equivalent of about 1065 m of turbidites, slope sediments and platform carbonates at the basin margin to the south. Ellesmerian regional deformation affected the northern part of the area showing a progressive increase of deformation of the deep-water sequence from south to north. The general strnctural pattern suggests a lithological anisotrophy within the upper part of the crnst with a buried carbonate shelf to the south bounded by an escarpment towards a deep silicic1astic basin to the north. The difference in total thickness of the Llandovery to Lower Ludlow sedimentary sequence between the south and north supports this hypothesis.
Highlights
Several lithological units of the Silurian Peary Land Group show a remarkable continuity along the E-W trending basin axis, but pronounced lateral facies changes occur N-S across the basin
An area of about 11 000 km2 of the Peary Land Group was mapped in Nyeboe Land, Hendrik ø, Castle ø, Warming Land, Permin Land, Wulff Land and Stephenson ø during the summer of 1984 as part of the 1984-1985 regional mapping program
The mapping units erected here follow the lithostratigraphic formations and members defined for the Peary Land Group by Hurst (1980) and Hurst & Surlyk (1982), and five new mapping units are recognised in this paper
Summary
Within the east-west orientated Nyeboe Land linear belt of Dawes (1982), several units can be traced for more than 180 km along strike within the almost vertically orientated Silurian turbidites. This shows the remarkable persistence in continuity and thickness of these units along the east-west axis of the deep-water basin. The Merquj6q Formation defined by Hurst & Surlyk (1982) is the lowermost lithostratigraphic unit of the Peary Land Group appearing only in the northern part of the deep-water basin (figs 1 & 2). The above graptolite evidence indicates that the bulk of the Merqujoq Formation (2.8 km thick as measured at Hand Bugt), was probably deposited entirely within the Fronian (CZ_3) - Telychian of the Late Llandovery
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