VI BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Geological relations of oil pools situated in regions of monoclinal 

 structure [abstract and discussion] ; by Frederick G. Clapp 737 



Geology of the Chibougamau region, Quebec, Canada [abstract] ; by 

 Alfred Ernest Barlow 738 



Occurrence of silver, copper, and lead ores at the Veta Rica mine, 

 Sierra Mojada, Coahuili, Mexico [abstract] ; by F. R. Van Horn. . . 738 

 Index to volume 22 739 



ILLUSTRATIONS 



Plates 



Plate 1— Clarke : Portrait of J. C. K. Laflamme 4 



2— Barlow : Portrait of David P. Penhallow 15 



3— Bownocker : Portrait of William G. Tight 19 



4-Clarke : Portrait of Robert P. Whitfield 22 



5 — Bell : Portrait of Thomas C. Weston 32 



6— Raymond : Portrait of William P. Blake 36 



7— HoBBS : Repeating patterns in landscapes 128 



8 " Rock structure becoming impressed upon the relief through 

 frost action 129 



9 * * Checkerboard topography 131 



10 " Relief forms controlled by the fracture system 138 



11 " Control of direction of waterways in humid regions of 

 moderate latitudes 139 



12 " Rectangular fracture and relief patterns 159 



13 " An example and a model of a fracture pattern 172 



14 — Branner : Limestone areas of the interior of Bahia, Brazil 187 



15 " Catinga limestone and travertine barrier 192 



16 " Channel of Rio Salitre and cliff of lime rock 193 



17 " Catinga limestone exposures 200 



18 — Calvin : Aftonian fossils 216 



19 " Aftonian fossils 216 



20 " Aftonian fossils 216 



21 " Aftonian fossils 216 



22 '' Aftonian fossils 216 



23 " Aftonian fossils 216 



24 " Aftonian fossils 216 



25 -Ulrich : Map of southern Appalachian Valley 281 



26 " Development of geological column and of stratigraphic 

 nomenclature from 1837 to 1911 376 



27 " Correlation Table I 608 



28 " Correlation Table II 608 



29 " Correlation Table III 608 



30 — Emerson : Relief map of Mount Toby and view of Hanging valley 



indicated thereon 681 



^' 31 " Hanging valley and vertical scarp : Mount Toby 682 



Figures 

 HoBB-; : 



Figure 1— Typical fault topography 125 



" 2— Typical fold topography 126 



" 3 — Some lines of profile each characteristic of a specal type of 



landscape 127 



