Abstract
The Serle Conglomerate is a lenticular unit (8 km × 160 m) at the top of the Late Proterozoic (Sturtian) glacigenic Yudnamutana Subgroup in the northeastern part of the Adelaide “Geosyncline”. In its type area at the west end of the Fitton Trough it can be subdivided into five stratigraphic units interpreted as the products of deposition in the mid-to-upper portions of a submarine fan complex. Progradation of submarine fans under conditions of eustatic sea-level rise was probably due to concomitant fault activity and isostatic readjustments(?) along the basin margins. In an area about 10 km west of the type area, similar conglomerates overlie glacigenic rocks of the Yudnamutana Subgroup with an erosional contact and therefore are younger than them. There is no definitive evidence of glacial influence during deposition of the Serle Conglomerate, so that previous correlations with glacigenic diamictites elsewhere in the Adelaide “Geosyncline” are unlikely. There is no justification, in this area, for inferring two separate early Sturtian glaciations.
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