AMEBICA. 120 



The rocks are mostly granite overlain by sandstone. Trap dykes 

 cause many waterfalls and rapids. 



Bradley, Frank H. On a " Geological Chart of the United States 

 east of the Eocky Mountains, and of Canada." Amer. Journ. ser. 

 3, vol. xii. pp. 286-291. 



Describes the new features of this compilation. 



Broadhead, Prof. G. C. Age of our Porphyries. Trans, Ac. Sci, 

 St. Louis, vol. iii. pp. 366-370. 



These S.E. Missouri porphyries (with which granite is associated) 

 have been regarded as Huronian. The writer inclines to the view that 

 the granites are older than the porphyries. G. A. L. 



Brooks, T. B. On the youngest Huronian Rocks south of Lake 



Superior, and the age of the Copper-bearing Series. Amer. Journ. 



ser. 3, vol. xi. pp. 206-211. 



Urges that the granitoid formation W. and S. of the Menominee 



Biver, about 90 miles from its mouth, is Huronian, and probably the 



youngest member of the series. This granitoid formation is uncon- 



formably overlain by the copper-bearing rocks, which are regarded as 



an independent series marking a definite geological period between the 



Silurian and Huronian. G. A. L. 



. Classified List of Rocks observed in the Huronian Series, 



south of Lake Superior, with remarks on their abundance, tran- 

 sitions, and geographical distribution ; also a tabular presentation 

 of the Sequence of the Beds, with an Hypothesis of Equivalency. 

 Amer. Journ. ser. 3, vol. xii. pp. 194-204, folding table. 

 Compares the developments of the series in the table as known in — 

 1. Canada, N. of L. Huron ; 2. Marquette Iron region, Michigan ; 3. 

 Menominee Iron region, Michigan and Wisconsin ; 4. Black River 

 series, Michigan; and 5. Bad River and Penokio Gap, Wisconsin. 



G. A. L. 



Brown, C. B. Canoe and Camp Life in British Guiana. 8vo. 



London. 

 Contains geological matter. 



Buckley, Dr. S. B. Second Annual Report of the Geological and 

 Agricultural Survey of Texas. 99 pp. 8vo. Houston, Texas. 



Burmeister, Dr. H. Description physique de la Republique Argen- 

 tine, d'apres les observations personnelles et etrangeres. [Physical 

 Description of the Argentine Republic] Translated from the 

 German by E. Maupas. T. 1, pp. 400. Paris. 



Carll, John P. Report of Progress in the Venango County District. 

 Observations on Geology around Warren, by P. A. Randall. Note 

 on the Comparative Geology of North-eastern Ohio and North- 



1876. K 



