No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 113 



Physical geography, Connecticut — Rice, 243 ; Rice and Gregory, 243a. 



Connecticut lowland — Burr, 12. 



southern New England — Davis, 91, 96. 

 Physical history of Triassic formation in New Jersey and Connecticut 



valley — Russell, 249. 

 Pierce, ]., Chalybeate spring at Litchfield — Pierce, 233. 

 Pig-iron, production — 282. 

 Pine Rock, description — Dana, 72 ; Davis, 98. 



map — Dana, 516. 

 Pitchstone — Emerson, iii. 



Plainfield, geology — Percival, 229 ; Rice and Gregory, 243a. 

 Plainfield quartz schist — Rice and Gregory, 243a. 

 Plants, fossil — Loper, 189; Newberry, 221. 

 Plumbago, Cornwall — Silliman, 263. 



Plymouth, geology — Percival, 229 ; Rice and Gregory, 243a. 

 Podunk sand}^ loam — Dorsey, 106; Pippin, 116. 

 Pomfret, geology — Percival, 229 ; Rice and Gregory, 243a. 



magnetic declination — -Gannett, 121. 

 Pomfret phyllite — Rice and Gregory, 243a. 

 Pomperaug valley, faulted area of Newark rocks — Hobbs, 154. 



fossil plants — Knowlton, 180. ' 



glacier action — Hobbs, 158. 



key areas — Hobbs, 160. 



maps — Hobbs, 550, 554, 555, 556, 557, 563. 



Newark system — -Hobbs, 155. 



structure — Davis, 83, 98; Hobbs, 155. 

 Pond Rock — Hovey, 565. 

 Porcelain clay, Somers — Hitchcock, 138. 



Porter, T. D., Floetz trap formation in Connecticut — Porter, 234. 

 Portland, foot-prints — Hitchcock, 144, 146. 



geology — Percival, 229 ; Rice and Gregory, 243a. 



quarries — Lindsley, 187; Johnston, 174. 



sandstone — Johnston. 174; Merrill, 217; Rice and Gregory, 243a. 



spontaneous movements of sandstone — Johnston, 174. 

 Post-Tertiary history of New England — Perry, 231. 

 Pot-holes, Gurleyville — Koons. 182. 

 Pottery manufacture — Loughlin, 190. 

 Poughquag quartzite — Rice and Gregory, 243a. 

 Prehnite, Woodbury — Hitchcock, 137. 



Preston, geology — Percival, 229 ; Rice and Gregory, 243a. 

 Preston gabbro-diorite — Rice and Gregory, 243a. 

 Primary system — - Percival, 229. 

 Profiles, rivers — 282. 



Progress of geology for 1882 — Hunt, 171. 

 Prospect, geology — Percival, 229 ; Rice and Gregory, 243a. 

 Prospect porphyritic gneiss — Rice and Gregory, 243a. 

 Pseudomorplis, northwestern Connecticut — Hobbs, 149. 



Taconic region — Hobbs, 149. 

 Putnam, magnetic declination — -Gannett, 121. 

 Putnam, B. T., Iron ore collected in Connecticut — Putnam, 235. 

 Putnam gneiss — Rice and Gregory, 243a. 

 Pynchon, W. H. G., Ancient lavas of Connecticut — Pynchon, 236. 



Common evidences of glacial action in Connecticut — Pynchon, 



237- 

 Drilled wells of Triassic area — Pynchon, 239. 

 Iron mining in Connecticut — Pynchon, 238. 

 Pyrite, crystals in meteorite — Gibb, 122. 



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