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Type: Theses
Title: Geology of the Barossa Valley
Author: Dalgarno, C.R.
Issue Date: 1962
School/Discipline: Dept. of Geology
Abstract: Lower Tertiary deltaic and lacustrine sediments at the southern margin of the Barossa Valley are designated at the Rowlands Flat Sands and the name Rowlands Flat Sands Conglomeratic Lens is proposed for a transgressive deltaic conglomerate near the base of the formation. Mineralogical composition of the sediments indicates a derivation by prolonged weathering on a fairly mature surface and dispositional structures and the abundance of staurolite at the type locality point to the Marinoan schists north of Nuriootpa as the source of part of the early sediment. The climate of the Lower Tertiary is judged to have been humid and a Cinnamomum flora is recorded from the late Eocene of Bakers Gully, near Clarendon. Fossiliferous deposits along the Para Scarp near Gawler and sands and conglomerates which extend several miles to the east are grouped together as an unnamed Middle Tertiary fluviatile and littoral sequence which has been correlated with the Port Willunga Beds. Upper Tertiary deposits include outwash clays and conglomerates in the Barossa Valley, Mount Crawford and Gawler areas. The basal Tertiary surface is known in the western part of the Murray Basin, in the Barossa Valley, the Golden Grove-One Tree Hill area and about the margins of the St. Vincent Basin. It shows slight to moderate relief. Uplift of the surface formed after the accumulation of the Lower Tertiary sands is inferred near Gawler where Middle Tertiary deposits blanket an eroded surface with local highs west of elevated residuals of the Lower Tertiary. The pre-Pliocene surface recognized in the hills west of Adelaide extends along the Para Block and may also be represented by the dissected plateau near Eden Valley and Gomersal. The Barossa Valley is interpreted as a shallow, asymmetrical syncline with a Tertiary fault of flexure, unrelated to any pre-existing structure, inferred along the steep south-eastern flank. No Tertiary movement is indicated on the Kitchener and Bremer Faults in this vicinity and part of the relief of the Barossa Ranges is attributed to differential erosion consequent upon general uplift of the Ranges. Within the Ranges broad warping along prominent zones of flexure has occurred throughout the Tertiary but dating of the movements and measurements of differential displacement are only possible about the margins of the Murray and St. Vincent Basins where well dated Tertiary deposits are affected. Three main phases of terrestrial deposits are postulated for the western margin of the Mount Lofty Ranges, the two most important being in the late Eocene and late Pliocene to Pleistocene.
Advisor: Glaseener, M.F.
Alderman, A.F.
Dissertation Note: Thesis (M.Sc.) -- University of Adelaide, Dept. of Geology, 1962
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