warman] PLEISTOCENE POTOMAC. 177 
Plummer (F. G.), Dodwell (A.), Rixon (T. F), Leiberg (J. B.), and Langille 
(H. 1).), forest conditions in the Cascade Range Forest 
Reserve, Oregon PP 9 
Plutonic rocks of Oregon and Idaho WS 78, p 21 
Pocahontas formation in West Virginia GF 77, p 3 
Pocono formation or sandstone of Pennsylvania Ann 22, 
in, pp 66, 611-612, GF 82, p 6 
Pogonip limestone of Nevada Ann 2, 
pp 22, map, 27, 30, 34; Ann 4, p 229; Bull 208, p 21 
Poinsett, Lake, South Dakota, reconnaissance of, for water storage Ann 22, 
iv, pp 303-305 
Point of Rocks group of Wyoming and Utah, age and correlation of. .Ann 3, p 415, 416 
Point Pleasant beds of Ohio Ann 8, n, pp 550-551 
Poison Canyon formation of Colorado GF 71, pp 2, 3 
Pokegama quartzite of Minnesota, Mesabi district Mon xliii, pp 90-09 
Poland, zinc from, statistics of MR 1900, p 226; MR 1901, p 223 
Polk Bayou limestone of Ozark region Ann 22, n, p 81 
Pollucite, action of ammonium chloride on Bull 207, pp 21-22 
analysis of, from Maine, Hebron Bull 207, p 21 
Polluted and normal waters in northeastern United States WS 79 
Pollution of streams, court decisions on, in Connecticut WS 79, pp 107-112 
Pompton River, New Jersey, flow of, measurement of. . WS 65, pp 211-212; WS 75, p 26 
Popanoceratidpe of America Mon xlii, pp 131-134 
Porcupine district, Alaska, placer gold mining in Bull 213, p 48 
Porosity of rocks and soils WS 67, p 16 
Porpezite, analysis of, from Brazil Bull 193, p 61 
Porphyritic granite of Minnesota, Mesabi district Mon xliii, pp 78-79 
Porphyritic rhyolite of Minnesota, Mesabi district Mon xliii, pp 68-69, 79-80 
Porphyry in Alaska, Copper River district, in unmetamorphosed sediments. .Copper, 
pp 56-57 
in Colorado, Sil verton quadrangle Bull 182, pp 33-34 
Port Clarence limestone of Alaska, Seward Peninsula, northwestern portion. . .PP 2, 
pp 17-21 
Port Hudson formation of Louisiana Bull 184, p 44 
Port Orford quadrangle, Oregon, geology of GF 89 
Portage group or formation of New York Mon xli, 
p 58; Bull 3, pp 7, 8, 13, 20-21, 29; Bull 41, pp 21, 22, 23-24, 25 
of New York, fauna of eastern extension of Bull 210, pp 71-73 
Porter (D. ), water powers of coast streams of New Hampshire. .Ann 22, iv, pp 61-81 
Portland cement. (See Cement, Portland.) 
Porto Rico, gazetteer of Bull 183 
general description, population, etc., of .-. Bull 183, pp 7-12 
history of the name Bull 183, p 7 
topography of WS 32, pp 11-15 
Portugal, arsenic production of MR 1901, p 257 
iron production of MR 1901, p 114 
manganese ore from, statistics of MR 1900, 
pp 135, 140; MR 1901, pp 149-150, 155 
pyrite production of MR 1901, pp 841, 842 
Post Creek, Montana, reconnaissance of basin of Ann 22, iv, pp 436-441 
D oteau group of Indian Territory Ann 22, in, p 376 
D otomac formation Bull 43, pp 100-103 
Albirupean series of deposits and flora Ann 15, pp 333-338, 
369-375; Ann 16, i, pp 473-474, 531, 532; Bull 82, pp 89-90, 94 
Bull. 215—03 12 
