Geology and Mineralogy, 111 



implements ; human fossils ; and finally, a summary of human 

 evolution which, together with an excellent bibliography, closes 

 the volume. 



This little book, which is one of the Cambridge Manuals of 

 Science and Literature, is well written and gives a very complete 

 and concise summary of the present state of our rapidly growing 

 knowledge of earty human progress. r. s. l. 



9. Early Man in America; \>y A. Hkdlicka. Correction. 

 The second paragraph from below on p. 553 of the above article 

 should read- as follows : 



As to the part that theory played in this connection, it is 

 sufficient to point to the system of human descent and migra- 

 tion constructed on the basis of the various finds, assumed to 

 indicate the presence of early man in South America, by 

 Ameghino. lie derived the whole human family from certain 

 little primitive forms in South America and peopled that con- 

 tinent with hitherto unsuspected species of man and genera of 

 precursors. He asserted that Africa and Oceania were peopled 

 by the descendants of a far distant South American precursor 

 of man, the Triprothomo ; and he assumed that a later spread 

 of man from South America peopled America, Asia and 

 Europe, resulting in the American, Mongolian and White 

 races. 



10. Geology and Ore Deposits of the Park City District, Utah ; 

 by John M. Boutwell. U. S. Geol. Survey, Prof. Paper, 77 ; 

 pp. 229, 44 plates, 18 figures. Washington, 1912. — The Park 

 City District is situated on the eastern slope of the Wasatch 

 Range in the north-central part of Utah. The greatest geologic 

 activity in the Wasatch Mountains took place at its junction with 

 the east-west Unita Range. At this point extensive and irregular 

 intrusion, wide extrusion, thorough contact metamorphism and 

 much faulting have produced in a small area highly complex 

 results. At the heart of this area have been formed the exten- 

 sive and rich ore bodies of the Park City district. 



The sedimentary rocks, which include sandstones, shales, quartz- 

 ites, and limestones, range in age from the lower Carboniferous to 

 Triassic. They have been cut, deformed and altered by a series of 

 intrusive diorites and diorite porphyries in the form of laccolites, 

 stocks, and dikes. Andesite flows are found on the outskirts 

 of the district. At the south there is a great laccolithic intrusion 

 of diorite with the sedimentary rocks lying on its flanks and 

 dipping toward the north and east. These upturned sedimentary 

 rocks are extensively faulted and intruded by stocks and dikes. 

 The metamorphosed and hardened sedimentary rocks extend as a 

 backbone in an east-west direction across the region and it is on 

 their northern slope that the extensive ore bodies are found. 



The ores, which are chiefly silver-bearing, consist of the usual 

 lead, copper, and zinc minerals. The principal ore minerals are 

 galena, tetrahedrite, sphalerite, and cerussite. The ores occur as 



