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Abstract
Field relations and the composition of the Quaternary molluscan and barnacle faunas at Pátorfik, Kûtsiaq and Sarfâgfik on the north coast of Nûgssuaq, West Greenland, are described. The marine Quaternary deposits at Pátorfik are older than 35 000 years. The lower part of the deposits seems to represent a prodelta environment, whereas the middle and upper parts apparently correspond to a delta slope. The rich fauna and the field relations differ essentially from what we know from other localities in Greenland where Late Wisconsian or Holocene marine fossiliferous deposits have been found. The faunal composition indicates prevailing water temperatures during deposition similar to those at the boundary between the arctic and boreal faunal regions today and somewhat higher than those in Umanak Fjord at present. It is suggested that the Pátorfik deposits were formed during the last interglacial stage (Sangamon/Eemian). The marine beds at Kûtsiaq and Sarfâgfik are of Early Holocene ages and apparently represent delta deposits.
Highlights
The present work deals with stratigraphical and palaeontological aspects of the marine Quaternary deposits on the north coast of Nugssuaq, West Greenland
It is evident that Alvania (Alvania ) sp. shows the closest affinity to A. (A. ) patorfikensis
The collabral ribs in Alvania (Alvania) sp. are not so coarse, neither as high nor broad as in A. (A.) patorfikensis. They are more numerous in the species in question; there are 26 collabral ribs on the last whorl in Alvania (Alvania) sp. versus 12-15 on the third whorl inA. (A.)patorfikensis which, only has 14-18 collabral ribs on the fourth whorl
Summary
The present work deals with stratigraphical and palaeontological aspects of the marine Quaternary deposits on the north coast of Nugssuaq, West Greenland. The abundance of the rather thermophilic species Panopea (Panomya) norvegica in the lower and Balanus (Chirona) hameri in the upper part of the section in Kløft II, Påtorfik, indicates higher water temperatures than at present in Umanak Fjord (see later). It the present-day conditions in the fjord are considered interglacial in character, the faunal dependence on the water temperatures indicates interglacial rather than interstadial conditions during deposition.
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