RECORDS. 323 



coal up to seven or eight dollars a ton, it is advisable for Ameri- 

 cans to investigate the matter of utilizing neighboring bogs as a 

 source of fuel supply. Mr. Wotherspoon's paper was illus- 

 trated by a series of briquettes manufactured from European 

 and American lignites and peats. He also exhibited a machine 

 by means of which he manufactured, in the presence of the 

 Section, briquettes from peat, which originated in Danbury, 

 Conn. The paper was actively discussed, and many questions 

 bearing upon the economic features brought forward by the 

 author, were asked. 



Dr. Berkey spoke of his observations, made in connection 

 with other lines of work last summer, that have shown an ero- 

 sion unconformity in the Carboniferous strata of the western 

 Uintahs. It is marked on the south side of the range by an 

 unevenness in the floor and a development of conglomerate, the 

 pebbles of which are of the preceding formation. The break 

 comes just above the chief limestone member of the series. 



The junction between the great basal quartzite of the United 

 States and the overlying strata is marked by a fault in this re- 

 gion with sufficient throw to bring two quartzite beds together 

 on the higher plateaus and be easily overlooked. This makes 

 it impossible to confirm Powell's unconformity at the top of the 

 quartzite as described by him in the eastern Uintahs. 



The discovery, however, of the Carboniferous erosion interval 

 a little higher in the series, throws additional doubt upon the 

 assumed Carboniferous age of the great quartzite member. 

 Allowing the break to cut out a part of the " Wasatch " lime- 

 stone and the ** Weber " quartzite, as developed in the Wasatch 

 uplift, the lithologic succession is satisfied better by assuming 

 Cambrian age for the low^est member in the Uintahs. 



There is no other break to the close of the Cretaceous. A 

 progressive unconformity, which increases in value against the 

 flanks of the range, marks the development of Tertiary sedi- 

 ments in the Duchesne Valley. A conglomerate, formed in 

 progressive overlap from the stream valleys to the higher moun- 

 tain tops of the flanks, has peculiar characters near the lime- 

 stone belt on account of which King called it "Wyoming" 



