WEEKS.] 
PETROLOGY, AND MINERALOGY FOR 1892-1900. 
299 
Pennsylvania— Con tinned. 
Devonian system of eastern Pennsylvania, 
Prosser, 4480. 
Does the Delaware water gap consist of two 
river gorges? Walter, 5831. 
Drainage features of Upper Ohio basin, 
Chamherlin and Leverett, 807. 
Drift, extra-morainic, Wright, G. F.,6506. 
Eopaleozoic hot springs, Wieland, 6129. 
Exploration of Irwin - Cave, Pennsylvania, 
Mercer, 3911. 
Extra-morainic drift, Williams, E. H., 6147. 
Extra-morainic fringe, Williams E. H.,6148. 
Fault in mammoth coal bed. Engel, 1722. 
Feldspar and kaolins, Eopkins, 2747. 
Feldspars in serpentine, Eopkins, 2744. 
Fire clays, Hopkins. 2745. 
Folds and faults in Pennsylvania anthracite 
beds, Lyman, 3(114. 
Fossil floras of the Pottsville formation, 
White, 6052. 
Fossil tracks in the Trias, Wanner, 5834. 
Fossil vertebrate from Port Kennedy, Pa., 
Cope, 1099. 
Gabbro, occurrence of, Kemp, 2976. 
Geology of Pennsylvania, Lesley, 3466,3467. 
Geology of southeastern Pennsylvania, Rand, 
1528. 
Glacial epoch, unity of, Wright, G. F., 6505. 
Glacialgebiel Nordamerikas, Wahnschaffe, 
f,77. r ). 
Glacial gravels in the Susquehanna Valley, 
Bashore, 290. 
Glaciation in Pennsylvania, Kiimmel, 3276. 
Glaciation in Pennsylvania, Williams. E. EL, 
61 15. 
Granite bowlder near Pittsburg, Pa., Gresley, 
2178. 
< Ireenland glaciers. Williams. 6151. 
Harrisburg terraces, Bashore, 289. 
Igeneous rocks of York Baven, Ehrenfeld, 
1619. 
Iron ores of Danville. Stock, 5247. 
Kansan drift in Pennsylvania. Williams. 6153. 
Limonite ores of Pennsylvania, Hopkins. 
2753. 
Mammoth bed at Morea, Pa., Williams, 6150. 
Manganese, Weeks, 5966. 
Microscopic structure of oolite, Hovey, 2763. 
Mineral localities of Philadelphia. Rand, 
Jeffris and Cardeza, 4523. 
Minerals and rocks, notes on some.Goldsm i th, 
2044. 
Monazite in Delaware County, Hamilton, 
2283. 
Mountain structures of Pennsylvania, Chit- 
tenden, 882. 
Natural gas fields, geology of, Cummins. A.. 
1222. 
New fossil localities, Foerste, 1831. 
New mammalia from Port Kennedy, Pa.. 
Cope, 1101. 
New Red of Bucks and Montgomery counties, 
Pa., Lyman, 3610. 
Nickel and pyrrhotite deposits, Kemp, 2985. 
[Nickel mine at Lancaster Gap, Pa.], Olcott, 
4135. 
Pennsylvania— Continued. 
North American geological notes, Gresley, 
2174. 
Origin of the Pennsylvania anthracite, Ste- 
venson, 5219. 
Origin of the wind gap, Wright, 6502. 
Paleozoic intraformational conglomerates, 
Walcott, 5794. 
Paleozoic vertebrata, Cope, 1103. 
Paleozoic invertebrates, Cope, 1082. 
Perido-steatite and diabase, Bascom, 278. 
Philadelphia brick clays, Salisbury. 4764. 
Pnysiographic types, Gannett, 1942. 
Piedmontite and scheelite, Williams, G. EL, 
6157. 
Potomac and Roaring Creek coal fields, 
Weeks, 5965. 
Pteraspidian, Palseaspis (Claypole), Ameri- 
can, Claypole, 983. 
Pyrophyllite slate, Meyer. 3977. 
Quartz and other minerals, Meyer, 3976. 
Relation of streams to Bryn Mawr gravel, 
Bascom. 280. 
Review of ancient volcanic rocks of South 
Mountain, [ddings, 2836. 
Sadsbury steatite, Rand, 1524. 
Section at Schoharie. Stevenson, 5231. 
Serpentines of eastern Pennsylvania, band. 
4526. 
Slate binders of the Pittsburg coal bed. Gres- 
ley, 2176. 
Slate regions of Pennsylvania. Merriman, 
3970. 
Senile new red horizons Lyman, 3607. 
South Chester Valley Bill fault, band. 1522. 
South Mountain glaciation, Williams. E. EL, 
6146. 
Southern ice limit in Pennsylvania, Williams, 
E. EL, 61 19. 
split in mammoth coal seam. Sims, 1985 
Stone, Hay. 1466. 
Stratification in the anthracite held, Was- 
muth, 5883a. 
Stratigraphic base of the Cambrian.Winchell, 
N. H.. 6307. 
Subterranean temperatures, Ha Hock, 2275. 
Surface geology, Salisbury and Knapp. 4773. 
Terraces of the < >hio and Beaver rivers, Hice, 
2506. 
The Buckstown coal fields. Pa., Althouse, 78. 
The Port Kennedy deposit, Pennsylvania, 
Heilprin, 2405. 
Trap dikes in Chester County, Pa., Frazer, 
1885. 
Trap dikes in Chester County, Pa., Rand, 1525, 
Triassic flora of York County, Wanner and 
Fontaine, 5835. 
Vertebrate remains from Port Kennedy, Cope, 
1104. 
Volcanic rocks of Mesozoic age, Goldsmith, 
2045. 
Volcanic rocks of South Mountain, Williams, 
G. H.. IV,. 
Volcanic rocks of South Mountain, acid, Bas- 
com, 275. 
Volcanic rocks of South Mountain, Pennsyl- 
vania, Bascom, 276. 
