Twelve rock samples from the Rough Range Structure were submitted by West Australian Petroleum Pty. Ltd. for micropalaeontological examination. The result of the examination of an earlier collection was given in Records 1955/48. Seven of the present samples came from a gully due east of Rough Range Well No.6 and five from a gully due east of Rough Range Well No.6 and five from a gully immediately south of Rough Range Well No.7. The distance between the two well sites is approximately 2 ¼ miles. A detailed description of samples from each section together with the thickness of the section is given below. The sections from each locality are arranged in descending stratigraphical sequence.

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