10.80350/TEST_DOI_5E587F8D6C32A
Geological Survey of New South Wales
1997
Text
0155-3410
Stratigraphy, structure and mineralisation of the Mudgee 1:100 000 geological map sheet
1997-03-01
Colquhoun G.P.
Meakin N.S.
Krynen J.P.
Watkins J.J.
Yoo E.K. Henderson G.T.M.
Jagodzinski E.A.
Quarterly Notes of the Geological Survey of New South Wales
The Mudgee 1:00 000 geological map sheet forms the south-eastern sixth of the Dubbo 1:250 000 geological map sheet and encompasses the exposed north -eastern margin of the Lachlan Fold Belt and the western margin of the Sydney Basin. Recent remapping of the map sheet area by the Geological Survey of New South Wales and the Australian Geological Survey Organisation (AGSO) resulted in a major reinterpretation of the stratigraphy and structure, particularly of the Late Ordovician volcanic units of the Cabonne Group - currently significant exploration targets of Cu-Ag mineralisation. The Lue beds - regarded as Silurian on the original Dubbo geological map sheet - have been divided into the Early Ordovician Adaminaby Group (quart turbidites) and the Late Ordovician -?Early Silurian Coomber Formation (mafic volcaniclastics, lavas, intrusives and mudstones). The mafic volcanoclastic Burranah Formation, previously regarded as Early Devonian, contains a Late Ordovician coral and conodont fauna in allochthonous limestones and has a similar radiometric signature to that of the Coomber Formation.