Abstract
Thirty-five samples from the late Precambrian Eleonore Bay Group and Tillite Group in the Caledonian fold belt in Bast Greenland were investigated for acid-resistant microfossils. Eleven samples yielded acritarchs. As a rule the state of preservation of the recovered acritarchs is poor, as aresult of slight metamorphism. Within the Eleonore Bay Group, identifiable acritarchs were recovered from four samples from the Limestone-Dolomite series, one sample from the Multicoloured series, one sample.from the upper Quartzite series, two samples from the lower Quartzite series and one sample from the Argillaceous-Arenaceous series. Relatively well preserved acritarchs occur in two samples from the slightly disconformably overlying Tillite Group. Some of the acritarchs recovered have a wide geographic distribution and apparently a narrow stratigraphic range in the upper Precambrian. Preliminary results indicate a Late Riphean age for the uppermost Eleonore Bay Group (Limestone-Dolomite series and Multicoloured series) and a Vendian age for at least the lower investigated parts of the Tillite Group.
Highlights
The East Greenland Caledonian fold belt extends from latitudes 70°-82° N in East Greenland occupying most of the ice-free stretch between the coast and the Inland Ice
The Eleonore Bay Group is overlain with slight disconformity by the Tillite Group, which contains a number of tillitic levels usually correlated with the widespread Eocambrian or Varangian
The Tillite Group disconformably overlies the Eleonore Bay Group and is, disconformably, overiain by the Kløftelv Formation which is apparently Lower Cambrian: the Kløftelv Formation is not necessarily lowermost Cambrian according to Cowie & Spencer (1970), who suggest the possibility of a PrecambrianCambrian poundary somewhete between the Upper Tillite and the Bastion Formation
Summary
The East Greenland Caledonian fold belt extends from latitudes 70°-82° N in East Greenland occupying most of the ice-free stretch between the coast and the Inland Ice. The microfossils recovered from the Limestone-Dolomite series are vety poorly preserved, with the notable exception of a sample from the upper part of the series at Ella ø (GD-2), which gave acritarchs in a state of preservation comparable with those from the Tillite Group. As a rule the acritarchs from the Limestone-Dolomite series and lower levels range in colour from opaque black for the largest specimens to grey for the smaller ones. This colouration representing alteration due to higher temperatures roughly corresponds to Correia's stages N3-N4, which could indicate that the rocks have been heated to about 150 to ~ 1800 C. By contrast a completely different situation has been found for the Upper Tillite Formation in Finnmark (North Norway), where studies by the author have shown abundant acritarchs which are found in the underlying Grasdal Formation
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