Boundary relationships between pre-Caledonian and Caledonian lithostructural units in the East Greenland Caledonides 72°-74°N

Abstract

In 1978 a further season of geological reconnaissance work was carried out in the inner fjord region of East Greenland between latitudes 72°-74°N. This work set out to establish a modem updated framework for the classic geological studies carried out by Lauge Koch's expedition (Haller, 1971; Koch & Haller, 1971) and was an extension of the Survey's work in the Scoresby Sund region between 1968 and 1972. New field work by the writers and others, supported by radiometric age determinations, has already contributed much new data (Rex et al., 1976, 1977; Higgins et al., 1978; Thyrsted, 1978). In 1978 several important localities were revisited, and 1:20 000 mapping undertaken in key areas south of Nunatakgletscher, in Knækdalen, around Kap Hediund and in Forsblads Fjord (fig. 29).