VI BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 

 Plate 48— Bascom : Contorted Baltimore gneiss. 294 



49 " Contorted Baltimore gneiss 295 



50 " Chester Valley limestone 299 



51 " Compressed anticline in Chester Valley limestone 300 



52 • ' Wissahickon mica-schist 302 



53 " Wissahickon mica-gneiss with isoclinal dip 303 



54 " Crumpled Wissahickon mica-gneiss 305 



55 " Granite-gneiss in Leeperville quarry 309 



56 " Granite-gneiss in Wards quarry 310 



57 Photomicrographs of hypersthene-gabbro 312 



58 " Photomicrographs of t^persthene-gabbro 313 



59 " Photomicrographs of meta-gabbro 314 



60 " Lafayette soapstone quarry 316 



61 " Specimens of steatite from Montgomery county, Pennsyl- 

 vania 317 



62 " Castle rock — a pyroxenite dike 318 



63 " Diabase dike 320 



64 Chester Valley limestone, with unconformable cover of 

 Triassic shales. 325 



65 — Mathews and Miller: Generalized sections across limestone area 



of Baltimore county, Maryland 347 



66 — Fuller : Jacob sand and Montauk drift 387 



67 — Stanton and Martin: Triassic and Lower Jurassic formations in 



Alaska .... 394 



68 " " Enochkin and Naknek formations, Alaska. . 395 



69 " " Enochkin and Naknek formations, Alaska. . 399 



70 " " Exposures of Naknek formation, Alaska .. . 407 



71 — Marsters: Geological map of Vermont 419 



72 " Geological maps of asbestos areas in Quebec and Ver- 

 mont 421 



73 " Belvidere mountain and Missisquoi valley 426 



74 " Valley at foot of Belvidere mountain, looking southeast. 433 



75 " Slip-blocks from the Tucker property 434 



76 Serpentine block and a section of a cross-fiber vein 435 



77 Photomicrographs of amphibolite 436 



78 " Photomicrographs of amphibolite 438 



79 Photomicrographs of serpentine 440 



80 Photomicrographs of amphibolite . . 440 



81 — Marsters : Photomicrographs of serpentine (section 42) 441 



82 — Cross and Howe : The Triassic unconformity at Ouray 456 



83 " " The Triassic unconformity at Ouray , 458 



84 " " The Triassic unconformity at Ouray 460 



85 " " The Triassic unconformity at Ouray 462 



86— Perkins: Fossils of the lignite of Brandon, Vermont 515 



87 Fossils of the lignite of Brandon, Vermont 516 



88 " Sections indicating the development of Paleozoic strata in 

 Nevada and the Wasatch uplift 528 



89 — Berkey : General map of northeastern Utah from Wasatch moun- 

 tains to Green river 529 



90— ^chuchekt: Portrait of Charles E. Beecher 541 



91— Scott : Portrait of John B. Hatcher 548 



92— Hovey : Summit of Mont Pele 567 



93 " Soufriere of Saint Lucia 569 



94 " Soufriere of Saint Lucia and boiling lake of Dominica 570 



