1 S^ Rev i&ivs — Br ief Notices. 



3. Queensland, Dkpartment of Mines. — Among other interesting 

 reports recently issued W. E. Cameron deals with the coals of 

 North Ipswich and Dalby, gold at Ormeau, tin-lodes of the Charters 

 Towers district, and olivines in the Toowoomba Basalts. These 

 latter are of so fine u size and colour as to recouiraend themselves to 

 European cutters for a market of 100 ounces per week. E. 0. Marks 

 deals with the Glossopteris flora near Hughenden and Pentland, coal 

 near Chinchilla, and gold at Mount Emu Plains and Cape River. 



4. Wyoming Geology. — An account by Mr. C. E. Jamison, of 

 the Douglas Oil-field, Converse County, Wyoming, is contained in 

 Bulletin 3, Series B, of the Report of the AVyoming State Geologist, 

 1912. The location of tlie fields, which are drained by tributaries of 

 the Platte River, is discussed, and a sketch of the topography of the 

 area is accompanied by a useful map. The geology is rather difficult, 

 because Tertiary beds mask the Triassic, Jurassic, and Cretaceous 

 rocks, and faulting causes further complications. Details of 

 formations are arranged in a convenient table, and the various 

 systems with their fossils are briefly discussed. A list of wells is 

 accompanied by descriptive notes, and information under the heading 

 "future development" is likely to be of value. The Muddy Creek 

 Oil-field, in Carbon County, is similarly treated, and the bulletin is 

 illustrated by eight plates. 



5. Mining in Elko Cocnty, Nevada. — Mr. E. C. Schrader gives in 

 Bulletin 497 of the United States Geological Survey a full account 

 of the physical and geological characters of the important mining 

 region which has in recent years been developed in Elko County, 

 Nevada. It lies in an area of folded and tilted Palaeozoic sedimentary 

 rocks cut by granular intrusives and flooded by Tertiary lavas, 

 principally rhyolite. At Jarbridge the mineral deposits occur chiefly 

 as tabulai', gold-bearing fissure veins and lodes in rhyolite, an 

 interesting feature being the exceptional abundance of adularia. 

 There appear to have been two distinct periods of mineralization, 

 calcite and barytes being first formed and afterwards silicified by the 

 rising of thermal solutions. At Contact and Elk Mountain the ore is 

 mainly copper, but a little silver and gold are also present. The 

 paper is well illustrated with maps and photographs, and is supplied 

 with a good index. 



6. Iron Ores of Tennessee. — Mr. R. P. Jarvis gives an account 

 of " The Valley and Mountain Iron Ores of East Tennessee " 

 [Resources of Tennessee, vol. ii, p. 326, 1912). Magnetite occurs 

 in the Cranberry granite, and its occurrence is attributed to segrega- 

 tion from the gabbro dykes. Bedded deposits and pockets of brown 

 and red liaematite occur in associaticm with Cambrian, Ordovician, 

 and Silurian formations. The yield in 1910 of red liaematite was 

 301,838 tons, and of brown haematite 430,409 tons. 



7. Rhodesia. — From the Tenth Annual Report of the Rhodesia 

 Museum for 1911 we learn that the rocks are arranged, the labelling 

 of the mineral collection is getting towards completion, and that the 

 palaeontological series is to be displayed at an early date. Good 

 collections of tinstone-bearing greisens and fine cassiterites are at 

 present on loan. 



