560 Notices of Memoirs — Internationol Geological Congress — 



IT. — The Tenth Meeting of the International Geological 

 Congress, held in the City of Mexico, September, 1906. [Being 

 the Abstract of a Eeport prepared and communicated by 

 Bernard Hobson, M.Sc. Vict., F.G.S., a Memb. Int. Geol. 

 Congress.] 



ripHE tenth triennial meeting of the International Geological 

 jL Congress was held this year in the city of Mexico. The 

 Mexican Government acted with the greatest liberality towards the 

 members of the Congress, while the inhabitants of the country did 

 their utmost to make their visitors feel that Mexico was not behind 

 any other country in its hospitality to strangers. Excursions to 

 places of geological interest were set on foot, and an excellent 

 guidebook, containing the most recent information relating to the 

 districts to be visited, was provided. The excursions included visits 

 to Vera Cruz, the volcanoes of Jorullo and Colima, Mitla Monterrey, 

 San Luis Potosi, the isthmus of Tehuantepec, etc. 



The Congress was opened in the School of Mines on September 6th 

 by the President of the Republic, General Porfirio Diaz. 



The first paper presented was a memoir entitled "Die Trochilisken," 

 by M. Karpinski. These are fossils of problematic origin, limited to 

 the Devonian. Mr. Heilprin read a paper on " The concurrence 

 and interrelation of Volcanic and Seismic Phenomena," in which he 

 advanced the opinion that earthquakes considered to be of tectonic 

 origin may really be due to volcanic agency sometimes remote from 

 the seat of the disturbances. In the discussion which followed 

 Professor A. C. Lawson, of Berkeley, California, dissented from 

 this view. 



Dr. Eenz's paper, " Ueber das altere Mesozoicum Griechenlands," 

 showed the importance of the marine Trias of Alpine facies iu 

 Greece, and pointed to the identity with the Trias of some marmorized 

 limestones hitherto regarded as Cretaceous. 



On September 7th a party of the members, under the guidance of 

 the Secretary, Mr. E. Orddiiez, inspected the olivine-basalt lava 

 stream at Coyoacan, six miles SS.W. of Mexico. The lava issued 

 from the volcano of Xitli, and it covers 60 square kilometres, being 

 30 kilometres long and 5 kilometres in maximum width 

 (E. Ordoiiez in Bol. del Inst. Geol. de Mexico, No. 2, 1895). 



At the meeting on the 8th September Professor F. D. Adams, of 

 Montreal, described the Geological Map of North America prepared 

 at the expense of the Geological Survey of the United States, the 

 material having been supplied by the Geological Surveys of Mexico, 

 the United States, and Canada. The nomenclature adopted is that 

 of the American Survey. In the discussion following the reading of 

 this paper the nomenclature was in some points called in question 

 by the Canadian geologists present. 



Professor Edgeworth David, of Sydney, then read a paper on 

 " Changes of Geological Climates," with special reference to Cambrian 

 and Permo-Carboniferous glaciation in Australia and India. 



The climatic evolution of the earth from the Palaeozoic to the 



