PETROLOGICAL ABSTRACTS AND REVIEWS 191 



Bucking, H. "Die Basalte und Phonolithe der Rhon, ihre 



Verbreitiing und ihre chemische Zusammensetzung," Sitzh. 



Akad. Wiss. Berlin. XXIV (1910), 490-519. 



The rocks described are feldspar basalts, nephelite basalts, nephelite 



basanites, nephelite tephrites, hornblende basalts, basaltites (trachy- 



dolerites), limburgites, and phonolites. Analyses are given of 78 rocks 



and 22 mineral constituents. There is a 2-page bibliography. 



A.J. 



Bucking, H. "Ueber vor- und nachbasaltische Dislokationen und 

 die vorbasaltische Landoberflache in der Rhon," Zeitschr. d. 

 deutsch. geol. GeselL, LXIV (1912), 109-24. 



Crawford, R. D. Geology and Ore Deposits of the Monarch and 

 Tomichi Districts, Colorado. Bull. 4, Colo. Geol. Survey, 

 Boulder, 1913. Pp. 317, pi. 25, figs. 15. 



While a great part of this report is economic, there are some 87 pages 

 devoted to the igneous rocks of the region, 21 to sedimentary rocks, and 

 17 to the processes of intrusion, metamorphism, etc. The pre-Cambrian 

 rocks described are granitic gneiss, hornblende gneiss, hornblende schist, 

 mica schist, garnetiferous schist, biotite-sillimanite schist, quartzite, 

 granite, granite porphyry, syenite, hornblendite, and diorite. Post- 

 Carboniferous igneous rocks are quartz diorite, quartz monzonite gneiss, 

 quartz monzonite, granite, quartz monzonite porphyry, andesite, quartz 

 latite, monzonite porphyry, latite, latite porphyry, andesite porphyry, 

 rhyolite, rhyolite porphyry, pitchstone porphyry, and breccias. 



A. J. 



Dale, T. Nelson, and Gregory, Herbert R. The Granites of 

 Connecticut. Bull. 484, U.S.G.S., Washington, 191 1. Pp. 

 137, Pl- 7, figs- 12. 

 This bulletin is a companion volume to those on the granites of Maine, 

 Massachusetts, New Hampshire, Rhode Island, and Vermont (Bulls. 

 313, 354, 404, U.S.G.S.). The granites of the state (the term granite 

 being here made to do service for granites, monzonites, diorites, pegma- 

 tites, and gneisses) are very varied in character, ranging in texture from 

 coarse pegmatites to fine quartz monzonites and from equigranular to 

 porphyritic. In color they range from blue-black to light gray and 



