Abstract

G. Dam, M. Larsen, H. Nehr-Hansen & T. C. R. Pulvertaft write: In a recent paper Clift et al. 1998 examine the evolution of the North European and Greenland margins prior to and during continental break-up. Both new apatite fission-track data and older, published descriptions have been used in their account, the principal conclusions of which are that (1) during the Cenozoic a maximum of 2.5 km of erosion occurred over most of the region, except in the Kangerlussuaq area in East Greenland where 4–6 km of erosion has taken place since 45 Ma; (2) prior to volcanism, rapid dynamic uplift was effectively synchronous at 63 Ma and preceded volcanism by <1.6 million years. The compatibility of these observations with current ideas on plume behaviour is discussed.

We have not scrutinized Clift et al.'s 1998 descriptions of areas of which we have no first-hand knowledge, and will direct our comments mainly at their account of the sedimentary evolution and uplift and subsidence history of the Cretaceous-Tertiary in the Nuussuaq (in this comment the authorized new spelling of Greenland place names is used throughout) area of central West Greenland, and in the Kangerlussuaq and Kap Dalton areas of southern East Greenland (Fig. 1).

West Greenland. As a perceptive reader will have noticed, Clift et al. 1998 base their description of the sedimentary evolution of the Nuussuaq srea entirely on articles in Geology of Greenland (Escher & Watt 1976) and references therein; in consequence their summary of the succession is out-of-date and

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