weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1901. 107 
Chemical analyses — Continued. 
Grano-diorite, Lindgren, 495. 
Hamlinite, Penfield, 597. 
Hancockite, Penfield and Warren, 603. 
Hanksite, Pratt, 623. 
Hornblende, Blasdale, 66. 
Hornblende-biotite-quartz-diorite, Spurr, 724. 
Horublende-quartz-andesite, Spurr, 724. 
Hornblende-syenite, Le Roy, 492. 
Hornblendite, Turner, 745. 
Hubnerite, Hoffmann, 380. 
Hydromagnesite, Hoffmann, 380. 
Hydromagnesite, Newland, 565. 
Ijolite, Washington, 783, 784. 
Iron, Courtis, 165. 
Iron ore, Hoffmann, 380. 
Iron ore, Obalski, 572. 
Jacupirangite, Washington, 783, 784. 
Kryptoperthite, Dresser, 242. 
Labradorite rock, Dana, 192. 
Ledouxite, Richards, 645. 
Lepidolite, Hoffmann, 381. 
Leucophoenicite, Penfield and Warren, 603. 
Limestone, Donald, 233. 
Limestone, Hoffmann, 380, 
Limestone, Kummel, 455. 
Limestone, Nichols, 566. 
Limestone, Russell, 662. 
Limestone, Siebenthal, 701. 
Limonite, Newland, 565. 
Lithiophilite, Brush and Dana, 88, 90. 
Magnesite, Newland, 565. 
Marcasite, Stokes, 729. 
Marl, Blatchley and Ashley, 69. 
Marl, Davis, 201. 
Marl, Kummel, 455. 
Meteoric iron, Pratt, 621. 
Meteorite, Merrill, 544a. 
Meteorite, Merrill and Stokes, 546. 
Missourite, Washington, 783. 
Mohawkite, Richards, 645. 
Monzonite, Cross, 176. 
Monzonite, Pirsson, 617. 
Mordenite, Pirsson, 615. 
Nasonite, Penfield and Warren, 603 
Natron, Hoffman, 380. 
Nickel ore, Ledoux, 486. 
Nordmarkite, Dresser, 242. 
Norite, Leonard, 491. 
Northupite, Pratt, 623. 
Oil, Knight and Slosson, 450. 
Oil, Mabery and Hudson, 507. 
Oolitic stone, Blatchley, 67. 
Pearceite, Penfield, 596. 
Pectolite, Eakle, 250. 
Perknite, Turner, 745. 
Pirssonite, Pratt,, 623. 
Pollucite, Wells, S09. 
Pulaskite, Washington, 783, 784. 
Pyrite, Stokes, 729. 
Pyroxenite, Turner, 745. 
Pyroxenite, Washington, 783. 
Quartz-porphyry, Le Roy, 492. 
Quartz-pyroxenite-diorite, Lindgren, 495. 
Quartz-syenite-porphyry, Le Roy, 492. 
Reddingite, Brush and Dana, 89. 
Rhyolite, Ordonez, 573. 
Chemical analyses — Continued. 
Rhyolite, Spurr, 724. 
Roscoelite, Lindgren, 497. 
Schist, Hoffman, 380. 
Schorlomite, Hoffmann, 381. 
Serpentine, Leonard, 491. 
Serpentine, Lyon, 506. 
Serpentine, Newland, 565. 
Serpentine, Smith and Willis, 709. 
Shonkinite, Pirsson, 616, 617. 
Shonkinite, Washington, 783. 
Shonkinite, Weed and Pirsson, 798. 
Spangolite, Penfield, 595. 
Spodumene, Brush and Dana, 91. 
Sperrylite, Wells, 808. 
Syenite, Dresser, 242. 
Syenite, Pirsson, 617. 
Syenite, Weed and Pirsson, 798. 
Talc, Blasdale, 66. 
Tetrahedrite, Chester, 136. 
Thaumasite, Penfield and Pratt, 602. 
Theralite, Washington, 783. 
Tinguaite, Washington, 783. 
Tremolite, Blasdale, 66. 
Triploidite, Brush and Dana, 88. 
Tysonite, Allen and Comstock, 11. 
Websterite, Leonard, 491. 
Websterite, Turner, 745. 
Wellsite, Pratt and Foote, 624. 
i Classification. 
Classification of geologic formations of Ten- 
nessee, Safford, 665. 
Discrimination of time values in geology, 
Williams, 826. 
Dual classification required in the nomencla- 
ture of geological formations in Canada, 
Ami, 27. 
Formations as the basis for geologic mapping, 
Eckle, 253. 
Colorado. 
American Nettie, Lakes, 461. 
Bastnasite and tysonite, Allen and Comstock, 
11. 
Building and monumental stones, Lakes, 472. 
Building stones, Lakes, 473. 
Cave ore deposits, Lakes, 464. 
Cripple Creek, Lakes, 462. 
Cripple Creek volcano, Rickard, 647. 
Curtis coal mine, Lakes, 463. 
Dinosaur beds of the Grand River Valley, 
Riggs, 650. 
Economic geology. La Plata folio, Puring- 
ton, 636. 
Economic geology of the Silverton quadran- 
gle, Ransome, 639. 
Geological occurrence of oil, Lakes, 478. 
Geology of Silverton quadrangle, Cross, 177. 
Jurassic dinosaur deposits near Canyon City, 
Hatcher, 345. 
La Plata folio, Cross, 176. 
Morrison formation, Lee, 487. 
Occurrence of limburgite, Stevens, 728. 
Oil springs of Rio Blanco County, Lakes, 476. 
Plastic dike near Ouray, Ransome, 040. 
Prospecting for oil, Lakes, 471, 475. 
Spanish Peaks folio, Hills, 374. 
Stratigraphy of the Black Hills, Darton, 199. 
Telluride ores of Cripple Creek and Kalgoor- 
lie, Rickard, 648. 
