THE LATE PROF. G. A, L. LKBOUR 237 



geological handbook of Northumberland and Durham, a book 

 full of original (observations; (3) A geology of Durham in the 

 Victoria County History, whicli gives a complete summary of 

 the geology of that county (1907); (4) The proof (with 

 Topley) of the intrusive character of the Great Whin Sill ; 

 (5) The division of the Lower Carboniferous rocks of North- 

 umberland, and the fixing of the limits of the Tuedian and 

 Bernician series : subsequent investigation has shown that 

 there is a line of unconformity between these two divisions at 

 the point taken by Lebour as their line of demarcation ; (6) 

 The proying (with Smythe) that two phenomena — a local un.- 

 conformity and thrust — were associated in the Coal Measures at 

 Whitley; (7) Numerous papers on the detailed stratigraphical, 

 structural and palaeontological features of the strata of North- 

 umberland and Durham; (8) The determination (with Herschel 

 and others) of the thermal conductivity of rocks, work which 

 is recognised as of high value ; (9) Several papers on foreign 

 areas, and (10) Many .papers on applied geology, including 

 one on the distribution of goitre. 



He did much original work at Skye, of which he allowed 

 the Geographical Survey to make full use, and much of the 

 results of his work on coal was given to a friend. The geology 

 of coal and of the coalfields of the world was perhaps the 

 subject he knew most thoroughly, and one must regret that 

 he never completed for publication a book on Coal and the 

 Coalfields at which he worked for years. 



Besides this more original work he wrote many general 

 papers, many reviews, edited and refereed many papers, 

 assisted in editing the volumes of Borings and Sinkings in the 

 Coalfield of Northumberland and Durham, and did much 

 consulting work, writing many reports on technical geology. 



In 1904 the Geological Society of London awarded him the 

 Murchison Medal in recognition of the importance of his 

 contributions to a knowledge of the Carboniferous and other 

 rocks in the Nortli of England. 



