PHOSPHATE DEPOSITS
Geological Examination
Interesting comment on the huge phosphate deposits at Clarendon, on the railway between Dunedin and Balclutha, is contained in the report of the Geological Survey, issued with the annual report of the Department of Scientific and Industrial Research. It is stated that the phosphate forms irregular masses associated with tertiary limestone. Calcareous beds in overlying sandstone are also strongly plioe-’plia I ic. The generally accepted theory of origin is that the phosphate segregated during the erosion of the limestone and so occurs in more or less isolated masses at the heads of gullies. The report, states that Mr. E. (.). Macpherson, who examined and mapped the deposits recently, “suggests that there is a fair chance of large quantities being present under the overlying _ sandstone and basalt. He draws attention also to a second phosphatie horizon in the sandstone some 20ft. to 30ft. above the main horizon. This, although of lower grade, may by processing yield a commercial product."
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https://paperspast.natlib.govt.nz/newspapers/DOM19421028.2.70
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Dominion, Volume 36, Issue 28, 28 October 1942, Page 6
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161PHOSPHATE DEPOSITS Dominion, Volume 36, Issue 28, 28 October 1942, Page 6
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