. Papers and proceedings of the Royal Society of Tasmania . -=« 05 1? O C o o Sa^ ^BSg05^B3o!-3^-0„. 330-an| BY W. H. TWELVETRBES AND W. F. PETTEED. 31 02 1-5 1^ CC !/J —J ^^ be - 2 ar=3 ?u »-s x^ ^ a .-V. c^. cv. p_^ o o o O _ o o o SS2 GPRP Q f- s s o o rt ^3 O !S-S 35^ CD C =i>-l Ph oT ^ 1* 05 vS §1 t3 c3 CO ca ^^ -< S /3 o In O ^ 6 O •g 2 Si ^.2:1 ^ 5s IF! ? O J^ -ti 3 O Oj : 3 U ^ rt OSS1^ p-i tc o 15 ^ > >^ 4 > • — 3 ^ ? f -/2 -Ji i/2 ^ 5 ^ o ii o ^ ^ 2 - be o „ t-i ^ G S 5 ° CS O r^ >^ t« bc^.3 o -— a: S 3 ? V .-, !=^ r^ _ „ i- O O i^ P a, cq o W H ^ « W S PO So c w-=-
. Papers and proceedings of the Royal Society of Tasmania . -=« 05 1? O C o o Sa^ ^BSg05^B3o!-3^-0„. 330-an| BY W. H. TWELVETRBES AND W. F. PETTEED. 31 02 1-5 1^ CC !/J —J ^^ be - 2 ar=3 ?u »-s x^ ^ a .-V. c^. cv. p_^ o o o O _ o o o SS2 GPRP Q f- s s o o rt ^3 O !S-S 35^ CD C =i>-l Ph oT ^ 1* 05 vS §1 t3 c3 CO ca ^^ -< S /3 o In O ^ 6 O •g 2 Si ^.2:1 ^ 5s IF! ? O J^ -ti 3 O Oj : 3 U ^ rt OSS1^ p-i tc o 15 ^ > >^ 4 > • — 3 ^ ? f -/2 -Ji i/2 ^ 5 ^ o ii o ^ ^ 2 - be o „ t-i ^ G S 5 ° CS O r^ >^ t« bc^.3 o -— a: S 3 ? V .-, !=^ r^ _ „ i- O O i^ P a, cq o W H ^ « W S PO So c w-=- Owe(Ow (Fisc (C r/j ^ ^ ?? .-? J ^>- ^ 3 !-^ c5 cc 3 -^ X 2 3 be^ s ?,ffi ^ ? 2 c^ --0 Z -1^ :i ?, 3 3 =S a-o Ssi^ >^ = 2 o lyptogiachygohytidosetrophihinosaiachygo O OPHKPH«aH HUMERI OF TASMAXIAX LABYRIXTHODOXTS J5V W. H. T\VELVETREES AXD W. F. PETTERD. M. ON THE FELSITES AND ASSOCIATED ROCKS OFMOUNT READ AND VICINITY. By W. H. Twelvetrees, , and W. F. Petterd^ Associated with the schists of Mount Read and districtare some obscure igneous rocks, siliceous in nature, com-pact in grain, often slightly schistose, which are what thefield geologist calls felsites or felstones. These convenient, need explanation, for in differentcountries they carry different meanings. In Germany theword felsite (or micro-felsite) is applied to the compacthomogeneous-looking groundmass of quartz porphyries^These porphyries are the acid volcanics of pretertiary age^In England, on the other hand, felsite designates the rock,,not its groundmass merely. If the petrographere of eachcountry could throw over the historical significance oftheir terms and come to some international agreement asto rock nomenclature and the meaning to be attached taterms, much of the present deplorable confusion woulddisappear. At present the discordance is
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