Text Appearing Before Image: Gillingham, Sw;inn & Co. Ltd., Printers, Adelaide Text Appearing After Image: Gillingham, Swann & Co. Ltd., Printers, Adelaide. 25 Geological Memoranda Second Contribution1. By Professor Walter Bowchin, F.G.S. Subjects:I. Miniature Serpuline Atolls.II. Pseudo-Cryptozobn Structure. III. A Prehistoric Alluvial Fan of Exceptional Character at the Mouth of the Glen Osmond Gorge. IV. The Occurrence of Scoriaceous Boulders in the Ancient Gravels of the River Torrens. (Read May 12. 1921) Plates V. to VII. r. Miniature Serpuline Atolls.PI. v. Professor L. V. Pirsson, in the Text Book of Geology byPirsson and Schuchert, has figured and briefly described(loc. cit., Part I., p. 180, fig. 152) some small atoll-likeformations that occur on the coasts of the Bermudas. Theexplanation given of the figure is as follows:— SerpulineAtolls, Bermudas Islands. These structures, formed inshallow waters, may be a number of feet or yards in diameterand are locally called boilers. Interesting examples of a similar kind occur on thecoast, at Encounter Bay, South Australia. The litt
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