Authors / CoAuthors
Draper, J.J.
Abstract
The Carlo Sandstone is part of the Toko Group of the Georgina Basin. This basin, which straddles the Northern Territory-Queensland border, comprises carbonate and clastic rocks of Cambrian and Early Ordovician age; the Toko Group forms the uppermost and dominantly clastic part of the sequence. The Carlo Sandstone, which is of possible Early Ordovician age (? latest Arenig), consists of very fine to fine quartzose sandstone containing siltstone and mudstone pellets. Minor siltstone and mudstone interbeds are present. The unit is conformable with the underlying Nora and overlying Mithaka Formations. Sedimentary structures present include: flute marks, current crescents, various other current lineations, ripple-marks, cross stratification, lamination and various biogenic sedimentary structures. The palaeocurrent measurements indicate uni-directional currents. Fossils are rare except in the uppermost part of the unit where gastropods, pelecypods, nautiloids, trilobites, brachiopods and fish are present. A study of geometry, lithology, sedimentary structures, palaeocurrents and fossils indicate subtidal to intertidal depositional conditions. Of various depositional models, a barrier model is favoured. The Nora Formation represents the offshore, below wave base sediments; the Carlo Sandstone the barrier, either dunes or bars; and the Mithaka Formation the lagoon-bay sediments. The sediments were deposited in an elongate epicontinental sea that also covered the Amadeus, Wiso and Canning Basins.
Product Type
document
eCat Id
80919
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- GA PublicationJournal
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- QLDNT
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
1977-01-01T00:00:00
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unknown
Topic Category
geoscientificInformation
Series Information
BMR Journal of Australian Geology and Geophysics 2:2:97-110
Lineage
Unknown
Parent Information
Extents
[-25.5, -17.0, 134.0, 141.0]
Reference System
Spatial Resolution
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