462 Scientific Intelligence. 



North of 50° S. two periods of folding were observed : the first 

 probably Paleozoic, the second Tertiary. This part is also marked 

 by the intrusion of large laccoliths, whose structures and rocks 

 bear a marked resemblance to those of the western United States. 

 North of 47° 30' the character of the southern Patagonian Cor- 

 dillera, as a folded range, changes, and at the Rio Aysen, where 

 a complete tranverse profile was obtained, the greater part of the 

 central chain consists of granitic igneous rocks, while the eastern 

 chain is composed of masses of porphyries and tuffs. Between 

 the two lies a band of sediments from which Belemnites and 

 other fossils were obtained. On the eastern slopes, down toward 

 the pampas, in several places immense fields of outpoured basalts 

 occur. In the southern portion of the area several large vol- 

 canoes were found, a southern continuation of the great series 

 of volcanoes of middle Chile. They are andesitic in character, 

 and their activity continued after the glacial period. 



A feature interesting to petrographers is the occurrence, at a 

 number of places in the Andes of southern Patagonia, of alkalic 

 rocks. These consist of intrusive masses of essexite, in stocks, 

 exposed domes, etc. These rocks are composed of purple, pleo- 

 chroic, titaniferous augite, brown barkevikite, labradorite and 

 analcite, the latter regarded as secondary, perhaps after nephe- 

 lite. They are accompanied by a series of dikes of bostonite and 

 camptonite with essexite-porphyry, and the author parallels the 

 occurrences with those of Southern Norway, made classic by the 

 researches of Brogger. In other places aegirite-granite-porphyry 

 is found with the essexite, while a trachydolerite is regarded 

 as an effusive equivalent. The occurrence of these alkalic types 

 in the sub-alkalic (alkalicalcic) province of the Andes is both 

 interesting and significant. l. v. p. 



7. Ueber einigige Japanische VulJcane ; von I. Friedlaender, 

 II Theil. Mitt. d. deutsch. Gesell. f . Nat. u. Volkerk. Ostasiens, xii, 

 2. Tokio, 1 91 0, with plates and map. —The author continues in this 

 article his description of the Japanese volcanoes, basing his work 

 upon his own observations, and upon those of others. It relates 

 chiefly to the northern part of the island empire, and much of 

 the material, drawn from Japanese sources, is now made available 

 to western people. "While it represents chiefly the observations 

 of the geological traveler, and contains no detailed studies, the 

 vulcanologist and geographer will find much to interest them, 

 especially the records of periods of activity for certain volcanoes, 

 which run back in some cases for over 1000 years. The article is 

 accompanied by a number of half-tone plates of the volcanoes 

 described, and by a map which shows their situations, l. v. p. 



8. Geological Survey of Ohio. J. A. Bownocker, State Geolo- 

 gist. JBourth Series, Bulletin 11. The Manufacture of Roofing 

 Tiles ; by Wolsey G. Worcester ; Edward Orton, Jr., Col- 

 laborator and Editor. Pp. viii, 476 ; 187 illustrations. — The Ohio 

 Survey has undertaken a series of Bulletins on the Clays and Clay 

 Products of the State, and the fact that this industry is so promi- 



