80 GEOLOGY. 



of basalt posterior again to the rhyolites. The series overlap one 

 another, having no great difference of age. Volcanic action commenced 

 in the Oligocene and reached its height in the U. Miocene period, 

 the district resembling the Grecian Archipelago. Hot springs still 

 exist, and earthquakes are not uncommon. Some of the puy- cones aro 

 visible. The granitic rocks are nnerupted andesite lavas, not Triassic 

 rocks metamorphosed in place, which are represented by aplite, having 

 been completely fused. Many analyses of igneous rocks are given. 

 The metalliferous lodes (N.N.E.-S.S.W.) are partly Post-pliocene. 



W. H. D. 



Judd, J. W. Contributions to the Study of Yolcanos. 2nd Series. 

 1 The Ancient Yolcanos of Europe. Geol. Mag. dec. ii. vol. iii. 

 pp. 53-63. 

 Describes the Kammerbuhl, Bohemia, a volcanic cone. 



. Contributions to the Study of Yolcanos. 2nd Series. On 



the Interval which separated the two great Periods of Yolcanic 

 Activity in Connexion with the Formation of the Alpine System. 

 Geol. Mag. dec. ii. vol. iii. pp. 337-345. 

 All the Mesozoic and L. Eocene formations attain enormous thick- 

 ness in the Alps, without a break. The deep-sea band separated 

 northern and southern life-provinces, and contained vast coral-reefs. 

 As with modern areas of depression, no volcanic action occurred in the 

 Mesozoic period in Central Europe. The Cambro-Carbonifercus geo- 

 synclinal of N. America is analogous to the Trias-Eocene geosynclinal 

 of the Alps. As subsidence ceased, volcanic action commenced on the 

 outskirts of the mass of sediments, eventually raising it above the 

 snow-level, so as to produce glaciers in a subtropical climate, as in 

 the British Oolites and modern Antarctic regions. W. H. D. 



On the Yolcanic Outbursts which preceded the Formation 



of the Alpine System. Gcol Mag. dec. ii. vol. iii. pp. 200-215, 

 woodcut. 

 Describes the quartz-porphyry of Botzen (Permian) and the igneous 

 rocks (Triassic) of Predazzo and Monzoni (monzonite, tourmaline- 

 granite, melaphyre, augite-> uralite-, and orthoclase-porphyry). A list of 

 minerals and many analyses given ; the subsidence lollowing eiuption 

 noted ; and the extent of the volcanic rocks shown. W. H. D. 



Jullien, — . Sur les gisements de silex et les tombeaux me'gali- 

 thiques de Khenchela. [The Elint Deposits and Megalithic Tombs 

 of Khenchela.] Bull. Soc. Anthrop. Faris, scr. 2, t. xi. p. 161. 



Kalkowsky, Ernst. Das Glimmerschiefergebiet von Zschopau im 

 sachsischen Erzgebirge. [Mica- schist of Zschopau.] Zdtsch. 

 deutsch. geol. Ges. Bd. xxviii. Heft 4, ])p. 682-749, tab. x. (sec- 

 tions). 



The chief divisions of the Archaic formation noticed are in natural 



