PENCK — PENROSE 145 



Page 



Pence, A., cited on planation 10, 78 



wave action 7, 402 



Penfield, S. L., Reference to apparatus devised by 6, 411 



Penh ALLOW, D. P., cited on Pleistocene flora of Canada 5, 113 



— and Sir William Dawson ; The Pleistocene flora of Canada 1, 311 



, Title of paper by 1, 553 



Pennian system, Proposal to establish the 2, 19 



Pennsylvania, Analyses of soils and clays from 9, 309 



— , Ancient beaches in 2, 473 



topography of 2, 554 



— anthracite 5, 39 



Aporhyolite of. 8, 393 



Appalachian deformation in 2, 141 



Baseleveling in 6, 19 



Clay-veins in Coal Measures of 9, 38, 39, 44, 45 



coals. Variation in the volatile combustibles in 5, 47 



Extramorainic drift in 3, 173 



Fossils from 8, 291, 292 



, Figures of. 7, 252 



Geological Survey, Work of 10, 95 



Glacial lakes in 2, 266 



— phenomena in 5, 281 



Glaciation in 2, 457 



Granites in .• 10, 380 



" Horse-backs " in Coal Measures of 9, 48 



Intra-formational conglomerates of. 5, 194 



Moraines in 5, 88 ; 6, 26 



Nickel mine at Lancaster gap 6, 3 



oil fields, Reference to character of 9, 95 



Oil of 3, 188 



Paleozoic rocks of 2, 19 



Plastic clays near Conshohocken 10, 480 



Reference to Pottsville basin of 6, 314 



Sand-veins in Coal Measures of 9, 43 



Sharon conglomerate lacking in 6, 319 



Slack-veins or soot- veins in Coal Measures of 9, 47 



Slates of. . . .• 2, 314 



Topography of 2, 542 



Traps from 2, 340 



Triassic of 3, 25 



Zinc ore of. 5, 30 



Penrose, R. A. F., Jr., cited on recalculations of rock-analysis 7, 356 



Reynosa beds 3, 230 



rock weathering 9, 258 



sugar apatite 7, 131 



Texas deposits 3, 92, 219 



— quoted on phosphates 2, 80 



— ; The Tertiary iron ores of Arkansas and Texas 3, 44 



XIX— Bull. Geol. Soc. Am. 



