122 GEOLOGY. 



Hayden, Dr. F. V. Note on some Peculiar Fornis of Erosion in 



Eastern Colorado, with Hcliotypo Illustrations. Bull. U.S. Geol. 



Suru. Territories, ser. 2, no. 3, pp. 210, 211, pis. vii., viii. 



Castellated sandstones of the Monument Creek (Lignitic) group and 



of Carboniferous (?) age respectively. A few stratigraphical remarks 



are added. " W. H. D. 



. Notes on the Surface Features of the Colorado or Front Range 



of the llocky Mountains. Bull. U.S. Geol. Surv. Territories, 



ser. 2, no. iv. pp. 215-231, plates ix., x. 

 These notes are accompanied by two panoramic views of the range of 

 mountains referred to, for the purpose of rendering the geological 

 features clearer. The first is that of the Colorado or Front Range, 

 taken from a point near Danver ; the second is the Pike's Peak Group, 

 taken from a bluff east of Monumant Creek. E. E., Jr. 



Hebsrt, Prof. E. Documents sur la geologic du bassin du MacKenzie, 

 recueillis par le Pere Petitot. [Notes on the Geology of the Basin 

 of the MacKenzie, collected by Father Petitot.] Btcll. Soo. Geol. 

 France, 3 ser. t. iii. pp. 87-93. 

 The introduction (pp. 87, 88) includes a list of 9 Devonian species 

 sent home by Father Petitot, and named by MM. Hebert and Munier- 

 Chalmas. These are identical with European species of that age. The 

 notes (pp. 88-93) open with a description of the materials used to make 

 stone implements by the natives ; they are jade, petrosilex, serpentine, 

 phonolite, kersanton, and orthoclase felspar. Of these, serpentine and 

 phonolite are found in place in the district, the others occurring as 

 rolled pebbles, &c. The writer next describes the enormous amount of 

 detritus and wood carried down by the river ; then notices some fuel- 

 deposits on the foot of the Eocky Mountains, which alternate with petro- 

 leum-schists in actual combustion. Lastly, a band of lakes is mentioned 

 which seem to be connected by underground channels only. G. A. L. 



Hillyer, E. Structure of Stone Mountain, a granitic mass in Georgia. 

 Amer. Journ. ser. 3, vol. x. pp. 234, 235. 



In this pure whitish granite " there is no doubt that below the sur- 

 face lamination a piece could be quarried out a quarter of a mile in 

 length if man could command the means." G. A. L. 



Hitchcock, Prof. C. H. Evidenee of Glacial Action upon the summit 

 of Mt. Washington, N. H. Amer. Journ. ser. 3, vol. x. pp. 305, 306. 



Note of a communication made at Meeting of the Amer. Assoc. 1875. 

 Small boulders of " Bethlehem gneiss/' which must have been carried 

 12 miles at least, have been found on this mountain 6293 feet above the 

 sea-level, in the usual moraine profoncle of the Northern Drift. G. A. L. 



Hunt, Dr. T. Sterry. Supplementary Note on the Geology of the 



North Shore of Lake Superior. Trans. Amer. Inst. Min. Eng. 



voL ii. pp. 58, 59. 



Various opinions have been advanced with regard to the age of these 



Sandstones ; the author suggests that the red sandstones of Thunder 



