A new lithostratigraphic framework for the Early Jurassic units in the Bundamba Group, Clarence-Moreton Basin, Queensland and New South Wales.  

Authors / CoAuthors

Wells, A.T. | O'Brien, P.E. | Willis, I.L. | Cranfield, L.C.

Abstract

Recent detailed studies of key transects throughout the Clarence-Moreton Basin have shown that a revision of nomenclature is required for units in the Late Triassic to Early Jurassic Bundamba Group. Revision of the stratigraphic nomenclature and elimination of the existing confusion in names of units in the basin was considered an essential first step in understanding basin evolution and assessing petroleum potential. We redefine the Marburg Formation as the Marburg Subgroup of the Bundamba Group and divide the Subgroup into two distinct lithostratigraphic units, the uniform sandstone of the Gatton Sandstone and the mixed sandstone and mudrocks of the younger Koukandowie Formation. The formations are upgraded existing members. The Gatton Sandstone contains locally developed members along the western basin margin. The Koreelah Conglomerate Member forms the base of the Gatton Sandstone where it overlaps basement rocks, and the Calamia Member of mixed shale, mudrocks and sandstone is a basal unit in the Gatton Sandstone in more basinward sections. The Heifer Creek Sandstone Member is a prominent quartzose sandstone unit in the Koukandowie Formation along the western margin and central parts of the basin. The older mixed mudrocks and sandstone of the Ma Ma Creek Member of the Koukandowie Formation are mainly known from the northwest. This new nomenclature preserves the integrity of existing stratigraphic names and is applicable basin- wide. One new stratigraphic name, the Koreelah Conglomerate Member, is introduced.

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document

eCat Id

81267

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Keywords

• GA PublicationJournal

• NSWQLD

Australian and New Zealand Standard Research Classification (ANZSRC)

• Earth Sciences

• Published_External

Publication Date

1990-01-01T00:00:00

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Australian Government Security ClassificationSystem    

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Creative Commons Attribution 4.0 International Licence    

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geoscientificInformation

Series Information

BMR Journal of Australian Geology and Geophysics 11:4:397-414

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