File:Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia (1920) (14760022256).jpg

Identifier: transactionsproc4445phil (find matches)
Title: Transactions and proceedings and report of the Philosophical Society of Adelaide, South Australia
Year: 1878 (1870s)
Authors: Philosophical Society of Adelaide, South Australia
Subjects: Philosophical Society of Adelaide, South Australia Science
Publisher: Adelaide : The Society
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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tinued itsexplosive activity and two other craters opened through thelava flow along a line of crustal weakness. These eruptionscontinued for perhaps two or three months, and then ceased,having built up three cones to an average height of 650 ft.,and covered 25 square miles with ash deposits. 6. Subsequently extensive collapse took place along theline of volcanic activity, and practically the whole of the threecinder cones caved in, forming great depressions, in thedeepest of which the waters of the sub-artesian basin formedlakes. 7. The origin of the water of the lakes is discussed, andalso the variation in the surface level, and suggestions areput forward regarding the rate of movement of the watersin this important sub-artesian basin. The close correlationbetween the annual rainfall and the variation in level of theunderground water supply has been graphically demonstrated. (22) This is brought from Mount Schank; the basalt at MountGambier is quite inaccessible. Vol. XLV.; Plate X.
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GilMngbain, Swanu a Co. Ltd., Printers, Adelaide. 205 8. The special features of the up-building and subsidenceof the Mount have been discussed in detail, and, finally, theeconomic value of each important feature has been described. DESCRIPTION OF PLATE X. Fig. A. Portion of the Blue Lake, looking eastward. Thecliff on the far side shows clearly the level-bedded marine lime-stones (1), and the stratified volcanic material (2), while portionof the basalt flow separating these two series has been emphasizedby a broken line to show it more clearly. A thicker developmentof the basalt may be seen on the left, just beyond the pumpingstation. Fig. B. View of portion of Mount Gambier, showing theLeg of Mutton Lake in the foreground, Tower Point beyond onthe right, with the Punch-bowl in the upper left-hand portion ofthe picture. The tree-clothed ridge in the centre of the pictureseparates the Leg of Mutton Lake from the Valley Lake, but thelatter is not visible; portion of Crater Lake may be

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