Julien.] 142 [December 6, 



Eulysyte, consisting of the iron-olivine, fayalite, garnet and 

 augite ; 



Lherzolyte, consisting of olivine, enstatite, diopside, and pico- 

 tite ; and 



Picryte, made up of olivine crystals in a matrix of hornblende, 

 diallage, or biotite, with magnetite and calcite. 



Dunyte, however, the only rock which, when unaltered, consists 

 entirely of olivine, with a little chromite or magnetite, is said to 

 occur in the South of Spain, in Norway, and in several other 

 European localities, of which little is known. The largest outcrop 

 occurs at the Dun Mountain in New Zealand ; of this Hochstetter 

 has given a description in considerable detail. 



On this continent the same rock has been also found in North 

 Carolina, Georgia and Alabama, as well as more recently in Can- 

 ada. 1 It is there found in important rock-masses in the immedi- 

 ate vicinity of the serpentines of Mt. Albert, North Ham, in the 

 Province of Quebec. It is finely granular, slightly friable, yel- 

 lowish to grayish-green in color, and contains a little chromite 

 and perhaps enstatite. 



In the western part of North Carolina, the chief outcrops of 

 this interesting rock occupy mainly a zone in the mountain-pla- 

 teau, between the Blue Ridge and the Great Smoky Range, about 

 250 kilometers long, and from 15 to 30 kilometers wide, from the 

 Rich Mt. in Watauga County, to the State line at Shooting Creek 

 in Clay County, and so on through South Carolina and Georgia 

 into Alabama. The beds are everywhere and exclusively found 

 enclosed in a stratum of hornblende-gneiss, black and slaty. This 

 forms the upper layer, and largely occupies the central zone of 

 the mass of gneisses and schists, entirely of types identical with 

 those found in the White Mountains of New Hampshire, which 

 make up the mountain plateau. 



Many facts in regard to the general features, lithological char- 

 acteristics and mode of occurrence of this rock have been already 

 published : in the paper by Prof. C. U. Shepard on Corundum ; 2 

 in the detailed description given in the Geological Report by 

 Prof. W. C. Kerr, 3 and the paper by C. D. Smith in the appendix 



IB. J. Harrington, Can. Nat., 1881, ix, 254. 

 2 Am. Jour. Science, 1872, (in) iv, 109, 175. 

 3Geol. of N. C, 1875, 1, 129, 130, 293, 298, 299. 



