264 BIBLIOGRAPHY OF NORTH AMERICAN GEOLOGY, 1906-1907. 
Platinum — Continued. 
Oregon : Day, 694 ; Stafford, 2276. 
United States: Day, 694; 2418, 2419. 
Pleistocene. See Quaternary. 
Pliocene. See Tertiary. 
Portland cement. See Cement. 
Pre-Cambrian. 
Stratigraphy. 
General. 
Archean period of North America : 
Heneage, 1130. 
Pre-Cambrian nomenclature : Cole- 
man, 540. 
Alaska: Brooks, 313. 
Colorado, Georgetown quadrangle : 
Ball, 118. 
Ouray quadrangle : Cross et al., 607. 
Routt County : Fenneman and Gale, 
863. 
Connecticut : Gregory and Robinson, 
1038. 
Franklin : Low, 1623. 
Iowa : Calvin, 387. 
Maryland : Clark and Mathews, 488. 
Mexico : Canon de Tomellin : Ord6fiez, 
1825, 1829. 
Michigan, Black River section : Gordon, 
984 ; Gordon and Lane, 985. 
Keweenaw Point : Lane, 1507, 1509. 
Pre-Ordovician : Lane and Seaman, 
1518. 
Minnesota, Cuyuna iron range : Leith, 
1557. 
Keweenawan at Lake of the Woods : 
Winchell, 2619. 
Vermilion Range : Abbott, 1. 
Missouri : Shepard, 2194. 
Montana, Algonkian formations : Wal- 
cott, 2470. 
Coeur d'Alene section : MacDonald, 
1658. 
Maryville district : Barrell, 149. 
Philipsburg quadrangle : Emmons, 
806. 
New Brunswick : Ells, 784. 
New Mexico, Hamilton mine : Lind- 
gren, 1590. 
New York : Adams et al., 13. 
Highlands: Berkey, 207. 
Long Lake quadrangle : Gushing, 
614. 
North Carolina : Graton, 1025. 
Nantahala quadrangle : Keith, 1352. 
Pisgah quadrangle : Keith, 1353. 
Roan Mountain quadrangle : Keitb, 
1354. 
Ontario : Adams et al., 13. 
Animikie iron range : Silver, 2212. 
Antik-Okan region : Hille, 1157. 
Grenville - Hastings unconformity : 
Miller and Knight, 1759. 
Huronian deposits north of Lake 
Superior: Bell, 189. 
Huronian ice age : Coleman, 544. 
Lake Nipigon to Lac Seul : Collins, 
561. 
Pre-Cambrian— Con tinued. 
Stratigraphy — Continued. 
Ontario, Lake Nipigon region : Cole- 
man, 548 ; Moore, 1771. 
Lake Temiskaming region : Miller, 
1754. 
Larder Lake district : Brock, 308. 
Micbipicoten iron ranges : Coleman, 
542. 
Pembroke sheet : Ells, 788. 
Quebec : Barlow, 145 ; Dresser, 742.. 
Pembroke sbeet : Ells, 788. 
St. Francis Valley : Dresser, 739. 
Rhode Island : Emerson and Perry, 
790. 
South Carolina : Graton, 1025 ; Sloan, 
2218. 
Pisgah quadrangle : Keitb, 1353. 
Utah, Uinta Range : Weeks, 2506. 
Vermont : Richardson, 2037. 
Wisconsin, north central : Weidman, 
2512. 
Waterloo quartzite : Warner, 2477. 
Wyoming, Bighorn basin : Fisher, 873. 
Bighorn Mountains : Darton, 647. 
Owl Creek Mountains : Darton, 642. 
Precious stones. See also Diamonds. 
California : Kunz, 1437. 
Idabo: Bell, 198. 
United States: 2418, 2419. 
Problematica. 
Archaeozoon : Matthew, 1698. 
Cryptozoan frequens : Walcott, 2470. 
Porocystis Cragin : Jarvis, 1285. 
Protozoa. 
Maryland Pleistocene - . Clark, 482. 
Pumice. 
United States : 2419. 
Pyrite. 
General. 
Origin : Willmott, 2603. 
Alabama : Smith, 2227. 
California : Aubury, 87. 
Massachusetts : Rutledge, 2108. 
Ontario : Fraleck, 893. 
United States: Nason, 1784; 2418, 
2419. 
Virginia : Watson, 2493. 
Pyrrhotite. 
Virginia : Watson, 2493. 
Quartz. 
Maine : Bastin, 162. 
New York, southeastern : Bastin, 163. 
United States: 2418, 2419. 
Quartzite. 
Classification and origin : Cayeux, 448. 
Quaternary. 
Stratigraphy. 
General. 
Drumlins, distribution and origin : 
Taylor, 2364. 
Glacial epoch, causes : Hilgard, 
1147. 
Glacial epochs : David, 657. 
