CANADA oy5 



345. Southern shore of Saint Lawrence river, 9 miles [below Quebec, Canada. 



Plication of shales and sandstones of Sillery terrace (No. 16). 



346. Cherty layers interbedded in Sillery shales, 8 miles below Quebec, Canada, 



on the southern side of Saint Lawrence river (No. 18). 



347. Unconformable contact of gneiss and Trenton limestone, | mile from Mont- 



morency falls, Canada (No. 13). 



348. Fault between Archean gneiss and Trenton limestone and Utica shale, just 



south of Montmorency falls, Canada (No. 11). 



349. Conglomerate of limestone, quartz, trap, etcetera, boulders, situated about 



1,500 feet down in Sillery red shales, 5 miles below Quebec, Canada, on 

 south shore of Saint Lawrence river. Dr R. W. Ells, of the Geological 

 Survey of Canada, in view (No. 21). 



Photographed by S. R. Stoddard, Glens Falls, New York 

 5 by 8 inches. Price 30 cents each 



350. Imbricating beach pebbles, at low tide in the bay of Fundy, 20 miles east of 



Saint Johns, N. B. (No. 1378). 



351. Entrance to harbor of Saint John, N. B. (No. 1375). 



352. Locality same as 351, " falls" at flood tide (No. 1374). 



353. Low tide in the basin of Minas, Nova Scotia (No. 1398). 



354. Low tide in the basin of Minas, Nova Scotia (No. 1399). 



Central America 



Photographed by E. T. Hill 



5 by 7 inches. Negatives in United States Geological Survey 



355. Costa Rica. Ira Zu volcano; ascent; outer view of crater (No. 37). 



356. Costa Rica. Ira Zu volcano ; outer view of crater, composed of rolling cin- 



der (No. 38). 



357. Costa Rica. Ira Zu volcano ; detail of slope of ancient floor of large crater 



within crater, showing one stratum of black lava in great mass of cinder 

 accumulation (No. 46). 



358. Hicaron island, in Pacific ocean, showing topographic features and modern 



erosion described by Mr Hill in paper on Panama. 



4 by 5 inches 



359. Costa Rica. Crater lake of Poas volcano (No. 32). 



360. Costa Rica. Crater lake of Poas volcano; geyser in operation (No. 33). 



361. Costa Rica. Outer rim of Ira Zu volcano; altitude, 11,400 feet (No. 34). 



362. Volcanic boulder drift, the chief geologic feature of Central America (No. 25). 



Colorado 



Photographed by C. Whitman Cross 



8 by 10 inches. Negatives in United States Geological Survey 



363. View on Brush creek, Gunnison county, Colorado, to show the swath cut by 



a snowslide through a dense growth of spruce (No. 21). 



