Conodonts of Ludlovian-Gedinnian age from the Yass Basin of New South Wales are described. The fauna consists of 61 species referable to 24 genera of which one, Coryssognathus, is new. Four conodont assemblage zones are recognized and correlated with classic Ludlovian-Gedinnian zones of Europe; two faunas, one of probable latialatus Zone age and the other of probable woschmidti Zone age, have also been recovered. Reworked Ludlovian conodonts from Devonian conglomerates at the top of the Yass succession are also described.

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In 1975, to obtain data to assist geological mapping by the Geological Survey of New South Wales and mineral exploration by mining companies, the Bureau of Mineral Resources flew a detailed airborne magnetic and radiometric survey of most of the area of Willyama Complex outcrop in the Broken Hill 1:250 000 Sheet area. This report describes the acquisition, processing, and presentation of the data, and figures the total magnetic intensity and radiometric contours and profiles now available.