Mixed ... H.Α. Thompson ... 1960 2157 ... 1937, 1938
Conglomerate Blocks Above Exhedra. Removal of Conglomerate Blocks from Above Exhedra in Fork of Great Drain ... Ζ-11 2146, 2147 Section Ζ 283 Section Ζ 284 ... 27 February 1938
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