Geology of the Alum Rock area near Stanthorpe, Southeast Queensland

Berg, Helen Rosemary (1973). Geology of the Alum Rock area near Stanthorpe, Southeast Queensland Other, School of Physical Sciences, The University of Queensland.

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Author Berg, Helen Rosemary
Thesis Title Geology of the Alum Rock area near Stanthorpe, Southeast Queensland
School, Centre or Institute School of Physical Sciences
Institution The University of Queensland
Publication date 1973
Thesis type Other
Supervisor G. Playford
Total pages 127
Language eng
Subjects 0403 Geology
Formatted abstract
Detailed geological mapping of the Alum Rock area, northwest of Stanthorpe, reveals a tightly folded sequence of probably Lower Carboniferous strata unconformably overlain by a thin sequence of Lower Permian sediments and volcanics. The Permian deposits are downfaulted into the Carboniferous sequence, probably as a result of taphrogenic movement associated with the emplacement of the Stanthorpe Granite.

Two rock units are recognized in the area: the probably Lower Carboniferous Texas Beds and the Lower Permian Alum Rock Beds. The former are typified by sandstones, rhythmically alternating with mudstones; together with minor quantities of intraformational conglomerate and siltstone. The Alum Rock Beds are divided into three informal units : Unit A consisting of sandstones, conglomerates and diamictites; Unit B of ignimbrites, rhyolitic tuffs and porphyritic rhyolites; and Unit C of sandstones, limestones and diamictites.

Two fossil assemblages, containing bivalves, gastropods, brachiopods, bryozoans and fossil wood, are distinguished within the Permian sequence. Six species (of molluscs and brachiopods) are described in detail and four others are discussed briefly. The older and sparser fauna, Fauna A, is probably correlative with the Trigonotreta campbelli Zone (of the eastern Australian Permian); while Fauna B, the younger assemblage, is considered to be representative of the Martiniopsis elongata Zone. Fauna B, a cold, shallow marine biota, has close affinities with faunas from the Cranky Corner and Sydney Basins, New South Wales, and indicates an Early Permian (Sakmarian) age.

The area has been subjected to several phases of deformation. Lower Carboniferous strata were folded and faulted during Late Carboniferous diastrophism (Kanimblan Orogeny). During Middle to Late Permian times block jostling and faulting occurred, presumably associated with the emplacement of various phases of the New England Batholith.
Keyword Geology -- Queensland -- Stanthorpe Region
Thesis -- BScHons

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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