REVIEWS 



175 



A. A. Julien. "Genesis of the Amphibole Schists and Serpentines of Man- 

 hattan Island, New York." Bulletin of the Geological Society of America 

 Vol. XIV (1903), pp. 421-94. 



Julien discusses the genesis of the amphibole schists and serpentines of Manhattan 

 Island, New York (including the Manhattan and Fordham series), and concludes that 

 they are derived from the alteration of basic igneous rocks. This appears established 

 by the correspondence of the hornblende rock in chemical composition to basic igneous 

 rocks and to hornblende schists of that derivation, by identity of its hornblende con- 

 stituent with that found in volcanic rocks, by the discovery of many apophyses, isolated 

 or in groups, and other structural features, and by the survival of products of contact 

 alteration. The absence of pyroxene and of dike-like intersection of the associated 

 gneisses may be well explained by the extent of shearing and metamorphism. 



T. L. Watson. "Granites of North Carolina." Journal of Geology, Vol. XII 

 (1904), pp. 373-407. 

 Watson maps and petrographically describes the granites of North Carolina. 



William H. Hobbs. "The Geological Structure of the Southwestern New 

 England Region." American Journal of Science, Vol. XV (1903), pp. 437-49. 

 "Lineaments of the Atlantic Border Region." Bulletin of the Geological Society 

 of America, Vol. XV (1904), pp. 483-506. 



Hobbs concludes that the crystalline rocks of southwestern New England have 

 been deformed by a system of joints and faults of post-Newark age superimposed 

 upon older structures which appear to be largely due to folding. He concludes 

 further, that the crystalline and later rocks of the Atlantic coast in general show linea- 

 ments suggesting regular sets of faults in a nearly meridional series and in two other 

 series which make nearly equal angles with this direction. Other lineaments which 

 more closely approach the equatorial direction vary more from one another, and are 

 both numerically less important and less strikingly brought out. 



Charles R. Van Hise. "A Treatise on Metamorphism." Monograph No. 



47, U. S. Geological Survey, 1904. Pp. 1,286. 



Van Hise discusses principles of metamorphism applicable to the study of pre- 

 Cambrian and other metamorphic rocks, and cites many illustrative pre-Cambrian 

 rocks and localities. 



W. S. Bayley. "The Menominee Iron-Bearing District of Michigan." Mono- 

 graph No. 46, U. S. Geological Survey, 1904. Pp. 513. 

 Charles R. Van Hise and W. S. Bayley. "The Menominee Special Folio." 

 Geologic Atlas of the United States, Folio No. 62, U. S. Geological Survey, 

 1900. 



Journal of Geology, Vol. IX (1901), pp. 451-54. 



Bayley and Van Hise describe and map the geology of the Menominee iron- 

 bearing district of Michigan. The essential facts are covered in a preliminary report 

 summarized in a former number of this Journal. An additional feature of interest is 

 the discovery of minute granules in the Menominee iron formation similar to the 

 greenalite granules from which the Mesabi ores are largely derived. 



Comment. — The age of the Quinnesec schists cannot be regarded as finally settled. 



