During the period May to July 1960, Santos Ltd acquired a single fold, 24 channel reconnaissance seismic reflection survey over the central Frome Embayment region of its OEL 12, to determine the thickness of strata and the nature of structuring in the underlying sedimentary section. Two semi-orthogonal traverses of continuous reflection profiling were planned to be recorded using one quarter mile shotpoint intervals, the first entailing 60 shot points located between longitude 140 degrees 40 minutes E. and 141 degrees E., and the other having 9 shot points located between latitude 30 degrees 10 minutes S. and 30 degrees 15 minutes S., for a combined total traverse length of 18.8 line miles. However, due to ensuing wet weather, the survey was unable to be completed as intended. The general geological setting of the embayment was previously known to comprise a shallow trough lying between the eastern Flinders Ranges and the Barrier Ranges. Existing well control within it, especially in the survey area, is very sparse. 44 miles away to the west, the Frome - Broken Hill Co.'s 1949 [Lake] Cootabarlow 1 stratigraphic bore had penetrated 1,560 feet of Mesozoic sediments (the Tambo - Roma -Blythesdale units), and had bottomed in presumed Cambrian metasedimentary rocks, the whole sequence being flat lying. The more closely located, 1325 feet deep Coonee Creek bore drilled in 1912 by the SA Government's Department for Water provided additional control down to the top of the Lower Cretaceous Blythesdale Group aquifer. The survey results indicate a sedimentary section ~2000 feet thick down to the base of ?Jurassic, in which the strata dip northwards, broken by one reverse fault that is upthrown to the west and trends northwards. This reverse fault has an associated northerly plunging anticlinal feature, the folded strata of which are uniformly thickening northwards, but with thinning over the plunging nose. No sediments older than Jurassic are interpreted; observed deep reflections are assumed to be multiples. Enclosures include three seismic sections; two structural contour maps of ?top of Blythesdale Group and ?top of Jurassic; one Blythesdale - ?Jurassic isopach map; and a Tertiary isopach map: plus three time domain cross sections showing reflection event quality gradings and shothole logs.