320 



INDEX 



Patapsco formation discussed, 149, 



153, 175. 

 Patapsco formation, sections in, 154. 

 Patapsco formation, fossils in, 155. 

 Patuxent formation discussed, 149, 



151, 175. 

 Patuxent formation, section in, 153. 

 Paul, E. G., 266, 275. 

 Peach Bottom slate belt, 103, 104, 



107. 

 Pegmatite veins, 101. 

 " Pensauken " formation, 194. 

 Peridotite discussed, 133. 

 Perryville, 83, 91, 97, 206, 215, 239. 

 Petrography of the crystalline for- 

 mations, 113. 

 Physical features of Cecil county, 



25. 

 Physiography of Cecil county, 63. 

 Piedmont Plateau, drainage of, 70. 

 Piedmont Plateau, origin of the 



streams of, 78. 

 Piedmont Plateau, structure of, 71. 

 Piedmont Plateau, topography of, 



69. 

 Pilot, 97, 239. 

 Pirsson, L. V., 141. 

 Pivot Bridge, 161, 163. 

 Pleasant Grove, 222. 

 Pleasant Hill, 217. 

 Pleistocene in Cecil county, 169. 

 Plum Creek, 207, 248. 

 Pond Creek, 160, 184. 

 Poplar Point, 153. 

 Port Deposit, 40, 67, SQ, 98, 117, 136, 



140, 195-205, 250. 

 Port Deposit Bridge Company, 197. 

 Port Deposit granite, analysis of, 



199, 200. 

 Port Deposit granite, test on, 202. 

 Port Deposit granite, strength of, 



201. 

 Port Deposit granite quarries, 196. 

 Porter Bridge, 100, 111, 119, 121, 124. 

 Potomac group, 149, 151. 

 Potomac group, sedimentary record 



of, 174. 

 Precipitation, table, 258, 260. 

 Preface, 19. 



Pressey, H. A., 20, 263. 

 Principio, 91, 119, 182, 206, 244. 

 Principio Company, 220. 

 Principio Creek, 28, 119, 136, 155, 



166. 



Principio Forge Company, 308. 

 Principio Furnace, 87, 99, 220. 

 Pulpwood, 306. 

 Pumpelly, R., 56, 84. 

 Pyroxenite, analysis of, 133. 

 Pyroxenite, discussed, 132. 



Q. 



Quartz-hornblende-gabbro, 92, 121. 

 Quartz-monzonite, 117, 119. 



R. 



Rainfall, 257. 



Rancocas formation, 149. 



Raritan formation discussed, 149, 



155. 

 Raritan formation, fossils of, 57. 

 Raritan formation, section in, 156. 

 Rating table for Susquehanna river, 



291. 

 Red Bank sands discussed, 162. 

 Reid, Harry Fielding, 61. 

 Ries, Heinrich, 62, 204, 207, 208, 211, 



212. 

 Riggs, analysis by, 129. 

 Rising Sun, 87, 96, 101, 112, 221, 232. 

 Rising Sun, magnetic station at, 289. 

 Roach Point, 210. 



Road materials in Cecil county, 223. 

 Roberts, D. E., 60. 

 Rock Run, 85, 97. 

 Rock Springs, 27, 70, 85, 93, 97, 218, 



221. 

 Rogers, H. D., 53, 54. 

 Rowlandsville, 120. 

 Russell, Wm., 219. 

 Rustin, John, 220. 



St. Mary's formation, 149. 



Salisbury, R. D., 48, 193, 194. 



Sassafras, 165. 



Sassafras loam, analysis of, 241. 



Sassafras loam discussed, 239. 



Sassafras loam, products of, 241. 



Sassafras Neck, 239, 242, 297. 



Sassafras River, 33, 34, 45, 160. 



Scharf, J. Thomas, 58. 



Schooley Peneplain stage, 72. 



Scotchman Creek, 160-162. 



Scott, Joseph, 49. 



Section at Foys Hill, 154. 



Section at Lower White Banks, 156. 



Section at Maulden Mountain, 156. 



