114 TFTE PROGRESS OF GEOLOGICAL RESEARCH IX TASMANIA, 



Passing now to those who have contributed towards our 

 knowledge from outside the ranks of the Geological Survey, 

 the name of the late R. M. Johnston, LS.O., must first be 

 mentioned. The death (in 1918) of this investigator deprived 

 Tasmania of one of her pioneer geologists, and one to whom 

 we are indebted for a great part of our knowledge in regard 

 to the stratigraphy of the Permo-Carboniferous and later 

 systems. 



To the late Thos. Stephens, M.A., who died in 1913, we 

 owe appreciable additions to our knowledge of the general 

 geology of the State. 



The Grim Reaper has also deprived us of that indefatig- 

 able worker in the realms of mineralogy and petrology — the 

 late W. F. Petterd, whose demise took place in 1910. His 

 "Catalogue of the Minerals of Tasmania," published by the 

 Mines Department in 1910, is still the standard work on this 

 subject. In collaboration with the late W. H. Twelvetrees, 

 the late W. F. Petterd contributed largely to our knowledge 

 of the petrography of Tasmanian igneous rocks. 



To Professor Sir T. W. Edgeworth David, K.B.E., 

 C.M.G., D.S.O., D.Sc, we are indebted for much advice during 

 the researches of this period under review, as well as for 

 contributions to the literature on the Permo-Carboniferous 

 and Pleistocene glacial geology of Tasmania. 



In 1903 Professor J. W. Gregory, D.Sc, visited the West 

 Coast, and his description of the geology and ore-deposits of 

 Mount Lyell, and several other papers on the physiography 

 and glaciation of that portion of Tasmania are valuable ad- 

 ditions to our literature. 



To Professor E. W. Skeats, D.Sc, is due the credit of 

 definitely determining the Tertiary age of the Port Cygnet 

 alkaline rocks. 



Important work on palaeontological questions was carried 

 out by W. S. Dun, especially in connection with the age 

 classification of the upper and lower palseozoics. Record No. 

 1 of the Geological Survey of Tasmania is the v/ork of this 

 pal&ontologist. 



In this domain of palaeontology A. F. Chapman, of the 

 National Museum, Melbourne, has assisted us to a great 

 degree in making determinations, and one of his contributions 

 has been published as Geological Survey Record No. 5. 



H. H. Scott, Curator of the Victoria Museum, Launces- 

 ton, has carried out very valuable researches on Nototherium 

 tasmanicum, and the results of his labours are embraced by 

 Geological Survey Record No. 4, and that very creditable 



