VI.—Spilite Lavas and Radiolarian Rocks in New South Wales

Abstract

The very interesting remarks made by Messrs. Dewey and Flett on “Some British Pillow-lavas and the Rocks associated with them” have further emphasized Dr. Teall's observation of the intimate association of Radiolarian rocks with lavas of this character, and which is particularly well developed in Europe in the later Devonian formations. It is further shown that such rocks are characteristic of areas of continuous off-shore subsidence, and are often intimately associated with intrusions of dolerite, quartz dolerite, gabbro, and serpentine.