. Le journal trimestriel de la Société géologique de Londres. f ice-action dans leurs localités. Au cours d'une première visite à la Tasmanie J'avais été frappé par themorainic aspect de certains lits près de Farrell, Emu-Bay andZeehan sur le .Chemin de fer. La localité est à environ 60 kilomètres de Burnie, en analtitude de 1300 pieds. Pour l'occasion d'examiner ces bedsI suis redevable à M. J. Stirling, le gestionnaire de la voie ferrée, whokindly arrête le train à cette fin. Availableclearly La preuve montre que les lits sont d'origine glaciaire. Ils comprennent des blocs erratiques somegigantic : conglomérat on mesure 25 par 18

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. The Quarterly journal of the Geological Society of London. f ice-action in their localities. During a first visit to Tasmania I had been struck by themorainic aspect of some beds near Farrell, on the Emu-Bay andZeehan .Railway. The locality is about 60 miles from Burnie, at analtitude of 1300 feet. For an opportunity of examining these bedsI am indebted to Mr. J. Stirling, the manager of the railway, whokindly stopped the train for this purpose. The evidence availableclearly shows that the beds are of glacial origin. They include somegigantic erratics of conglomerate : one measures 25 by 18 by 12 feet, and numerous smaller erratics occur beside it. They are not frag-ments, left in situ by the denudation of a band of the West-Coastconglomerates, for they rest on a bed of clay. Mr. Stirling tells methat, during the construction of the railway, a hole was dug intothis clay, at a culvert a few hundred vards south of the biggest Q.J. G.S. No. 237. b Fio- 9 -Sketch-map of North-Western Tasmania, illustrating the range of the Pleistocene r/laciation.. Vol. 60. THE GLACIAL GEOLOGI OF TASMANIA. 51 •J erratic; and although the hole was 20 feet deep, it did not reachthe bottom of the clay. Associated with the conglomerate-boulders are others of variousigneous rocks, belonging to the series of felsites. I pulled threesmall boulders out of the clay exposed on the cutting for a culvert, close to the biggest erratic ; two of the three boulders had glacialscratches. The glacial clay was soft, though tough ; it had thelithological characters of a recent, and not of a Carboniferous glacialdeposit. Moreover, the northern face of Mount Black (altitudeabout 3500 feet), the nearest conspicuous mountain, appears con-spicuously moutonnee, affording further proof of recent glacialaction in this part of Tasmania. Mr. Stirling kindly invited me to ride on the locomotive fromFarrell to Zeehan, and thus I had a better view of the cuttingsthan I could have got from the railway-carriage. I was

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• bookcentury1800
• bookdecade1840
• booksubjectgeology
• bookyear1845