GEOLOGICAL NOTES — HONEYMAN. 335 



silica. The magnet readily separates the magnetite. There are 

 other black grains which may be hornblende. Hornblende is 

 seen in the schists as well as garnets. The gold and silica may 

 be derived from the quartz vein. Grains of magnetite may ex- 

 ist in the schists in the same way as it occurs in the Archaean 

 gneisses of the Cobequid mountains. Vide Paper " Archcean 

 Gneisses of the Cobequids Magnetitic.'' Trans. 1880-81. The asso- 

 ciation of gold with garnets and magnetite in the auriferous 

 " Archseo-Cambro Silurian (lower) of Nova Scotia seems to be of 

 additional interest, as it suggests relationship with distant and 

 foreign auriferous formations where gems and gold with magnet- 

 ite are seen associated. It certainly has a tendency to correlate 

 the " Nova Scotia Gold Fields" with the " Medicine Bow Range/ 

 Wyoming, U. S. This is regarded as having a " strong resem- 

 blance" to " characteristic beds" of the " Huronian formation in 

 Canada." " The rock masses which form the Medicine Bow 

 Range have as constituents quartz, orthoclase, plagioclase, horn- 

 blende, mica, chlorite and carbonate of lime. As accessory min- 

 erals there occur garnet, epidote, magnetite, pyrite, cyanite, 

 gold and calcite ; under the microscope, in addition to the 

 above, were detected, zircon, apatite and titanite." Descriptive 

 Geology. Medicine Bow Range. By Arnold Hague. Page 109. 

 United States Geological Exploration of the Fortieth Parallel, 

 Clarence King, geologist in charge. Vol. II. Page 109. 



We have all the constituent minerals above enumerated as 

 constituents of our rocks, and all the accessory minerals re- 

 cognized, with the exception of cyanite, zircon and apatite. 

 In the place of these we can substitute staurolite, andalusite, 

 tourmaline, arsenopyrite, calchopyrite and molybdenite. As 

 I use the term Cambrian, as it is understood by H. M. Geological 

 Survey of Great Britain, my nomenclature, Archaeo-Cambro- 

 Silurian (lower), will be considered by some as equivalent 

 to Archaean, applied to the Medicine Bow Range, Cambrian 

 and Huronian being regarded as convertible terms. I would 

 observe also that the distinction made by Mr. Hague between his 

 Colorado and Medicine Bow " Archaean," is precisely the same as 

 I make between our great Gold Field series of rocks, an! the 



