Abstract
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In the Tabberabbera district of eastern Victoria, Ordovician sediments comprise a 4-5 km thick succession of quartz-rich turbidites named the Hotham Group. Conodonts and graptolites occur in rare cherts and black shales which are interbedded with the otherwise unfossiliferous succession. A Lower to Middle Ordovician (Darriwilian) age is suggested. The oldest strata are ribbon cherts of probably Early Tremadocian (pre-Lancefieldian) age that occur as tectonic slices along the Wonnangatta Line, a major fault to the west of Tabberabbera. -Authors