Thirty three kilometres of high resolution seismic was shot in March 1991 on Moolawatana 1:100 000 map sheet, between Lake Crossing Bore and drill hole 588/6, southeast of Mount Hopeless. The project aimed to ascertain the tectonic character of the Blanche Lineament, determine structure and lithologic continuity of the Eromanga Basin sequence, determine the presence or absence of older basin sequences (Cambrian, Permian), examine basement topography and structure, and, if possible, elucidate any structure within the Tertiary sequence. Geoflex detonating cord (50 m long charges ploughed in to an average 0.5 m depth)provided the seismic energy source. Seismic data acquisition was carried out by VELSEIS Pty Ltd using a Sercel 338-HR 96 tracer recording system. Six hundred percent CDP coverage was obtained using symmetrical spread receiver geometry (100 m shotpoint interval, 12.5 m group interval). A high quality seismic section was produced, revealing a probable cause for the Blanche Lineament, viz. a SW shallow dipping diachronous thrust fault. In addition, the section revealed abundant listric faulting within the Mesozoic shales, the presence of a thick pre-Mesozoic SW dipping sequence, the presence of probable crystalline basement near and south of Mt Hopeless, and deformed Mesozoic / Tertiary strata east and SE of Mt Hopeless. There is a discrepancy between the drilled depth to `basement lithologies and the interpreted position of the basement reflector at the Mt Hopeless end of the line. Furthermore, the ages and lithologies of pre-Mesozoic rocks have not yet been resolved. Two drill holes located at station points 178 and 1685 would resolve these uncertainties.