ILLUSTRATIONS XI 



Page 



Origin of pillow lavas ; by J. V. Lewis 591 



Mechanical composition of clastic sediments ; by J. A. Udden 655 



Origin of oolites and the oolitic texture in rocks ; by T. C. Brown 745 



Index to volume 25 781 



ILLUSTRATIONS 

 Plates 



Page 



Plate 1 — Watson : Portrait of W. M. Fontaine 6 



" 2— White : Portrait of T. M. Jackson 13 



" 3 — Udden : Limestone boulders 67 



" 4 — Cairnes : Tindir sections in vicinity of Porcupine River 188 



" 5 " Cambrian and pre-Cambrian (?) beds, Yukon- Alaska 



boundary line 190 



" 6 " Mountain groups composed almost entirely of Paleo- 

 zoic limestones and dolomites 193 



" 7 " Typical exposures of Mesozoic beds, British Columbia. 201 



*' 8 " Mesozoic beds, Kandik River 202 



" 9 — Wright : Glacial topography. Glade Run Terrace, Pennsylvania. 215 



" 10 — Fairchild : Approximate marine plane in the Connecticut Valley . 220 

 " 11 " Pleistocene marine submergence of the Connecticut 



and Hudson-Champlain valleys 234 



" 12 — Sardeson : Flat sharp-edged pebbles from the Galena formation. 265 

 " 13 — ScHUCHERT : Contacts between Siluric and Ordovicic (Cincin- 



natic) systems 286 



" 14 " Contacts o^ the Cataract in Ontario, Canada 287 



" 15 — Lewis : Pillow basalt 654 



" 16 " Pillow basalt 654 



" 17 " Pillow basalt and glaciated surface of Ely greenstone. . 654 

 " 18 " Pillow lava and "ellipsoidal structure in intrusive 



basalt" 654 



" 19 " Pillow surfaces of ellipsoidal greenstone and cross-sec- 

 tion of radial jointing of pillow lava 654 



** 20 " Pillow lava and pillow diabase 654 



" 21 " Pillow lava features 654 



" 22 " Pillowy lava at Kilauea, Hawaii 654 



" 23 '* Pillow lava 654 



" 24 " Boulder of pillow basalt 654 



" 25 " Spheroidal weathering of basalt 654 



" 26 — Brown : Micro-sections of oolitic structures 778 



" 27 " Micro-sections of oolitic structures 779 



" 28 " Micro-sections of oolitic structures 780 



Fig r RES 

 Hopkins : 



Figure 1 — Sketeli map of a portion of eastern central New York.. 69 



Moore : 



Figure 1— Thin-sections of oolitic and pisolitic barite 78 



