Abstract The Ordovician of the southeastern Lachlan Fold Belt (LFB) is represented by two contrasting provinces: the Molong volcanic province, with shoshonitic basalts and shallow marine sediments in the north; and a very extensive but relatively thin quartzose flysch, chert and black shale sequence elsewhere. This paper concentrates on the latter and reviews its stratigraphy, correlation, sedimentary facies, palaeocurrent directions and structure. The Molong volcanic province contributed insignificant sediment to the surrounding turbidites, and there is no evidence that the rise was a fragmented arc, as is postulated by most previous workers. The rise may have been a hot-spot volcano, and the southeastern LFB appears to have been a passive margin in the Ordovician. Within the flysch province, two terranes are recognized, the Melbourne Terrane in the west and Benambra Terrane in the east, both showing overall upward and eastward fining in the Ordovician. The boundary is the Mount Wellington Fault Zone, along which a post-Ordovician dextral strike-slip of up to 400 km is postulated.