854 



(xEllfEEAL rSTDEX, 



Poaka Beck, Stockdale Shales of, 697 ; 

 section at, 698. 



Point .Elianus, 516. 



Pont-rhj-d-defaid, dioritic rocks near, 

 498. 



Porphyritic dykes in the Seringapatam 

 area"; 647, 648. 



felstone, from Mysore, characters 



of, 652. 



Porphvry and Conglomerate, plan of 

 junction of, in Twt Hill Field- 

 quarry, CaeraarTon, 273, 



of' Llrn Padarn and Moel Try- 



faen, 282. 



Port Clai'euce. boring near, section in, 



779, 782. 

 Porth Llanlliana, vievr in. lookmg east, 



520. 

 Llechog, plan of hill-crest west 



of, 522. 



Phyffydd, cleavage and con- 

 tortion shown at, 481. 



Porth-T-defaid, Pre-Cambrian rocks 

 at, 468, 472. 



Porth-y-ly-wod, plan of shore west of, 

 491. 



Post-glacial time, Mr. T. MeEard 

 Eeade's estimate of, 291. 



Potsdam Sandstone, 806. 



Pre-Cambrian land-surface, " denuda- 

 tion of the, in the K'orth-west High- 

 lands, 400. 



movements, later, in the Archaean 



rocks of the Xorth-west Highlands, 

 391, 399 : effects of. on the intrusive 

 dykes. 391 ; effects of, on the gneiss, 

 395. 



rocks of Anglesey, 464, 466 ; of 



the Lleyn Peninsula, 530. 



Pressure, Prof. Bonney on some re- 

 sults of, in stratified Palseozoic rocks 

 near Morlaix, Brittany, 11. 



Prestwicb, Prof. Joseph, on the Corre- 

 lation of the Eocene strata in Eng- 

 land. Belgimn, and the north of 

 France, 88. 



Prince Albert, section through, 

 270. 



Prince-Edward Island, Triassic red 

 sandstone of, 815. 



Proetus brachy-pygiis, 725. 



Proiguanodonts. 51. 



PuUan, section through, 426. 



Pull Beck, Stockdale Shales in, 687. 



Quadrant Island, 312, 313 ; granulite 

 and greenstone of, 317. 



Quartz and flakes of mica, develop- 

 ment of, in felspar crystals, 36. 



in greensand at base of Thanet 



sand, 755. 



Quartz, micro-crystals of, in the Car- 

 boniferous Limestone at Clifton, 

 194. 



knobs in the rocks of Angle- 

 sey, 475, 488, 508 ; at Pen-y-parc, 

 Beaumaris, 508. 



Quartzite, shckensides on, 639 ; of the 

 Melkote area, 640. 



of the neighbourhood of Sudbury, 



Canada, 35 ; of the Zuurbergen, 

 Zwartebergen, and Wittebergen,240, 

 241. 



Quartz-rock of the Seringapatam area, 

 646. 



Quartz-veins, displacement of, 640; 

 downward attenuation of, in the 

 Melkote area, 643 ; double faulting 

 of. 644. 



Quebec Group, 807, 808. 



Quinaig, section from, to the Ben- 

 more thrust-plane, 418. 



Quiraing, Skye, tachyhte from, 304. 



Bastrites maxiraus, zone of, 703 ; in 

 Skelgill Beds and Birkhill Shales, 

 708. 



Rawthey, river, Stockdale Shales on, 

 705. ' 



Eeade, Mr. T. MeUard, an estimate of 

 Post-glacial time, 291. 



Eed beds of the Stormberg series, 253. 



Eed Chalk, analyses of, 358; fossils 

 from the, in Lincolnshire and 

 Yorkshire, 347 ; minute structure of 

 the, 355 ; in Lincolnshire, 324 ; in 

 Yorkshire. 333 ; of Lincolnshire and 

 Yorkshire, 359. 



Eed Crag, Ailurus angliciis, a new 

 Carnivore from the, 228. 



Eed-Eock Series of the Devon coast- 

 section, Eev. A. Irving on the, 149. 



Regnosaurus, 53. 



Eeport on the recent work of the 

 Geological Surrey in the North- 

 west Highlands of Scotland, 378. 



Eesidues, insoluble, obtained from the 

 Carboniferous Limestone Series at 

 Chfton, 186. 



Ehosbeu'io Shales, 515. 



Ehyl, fossils of the drift at, 120. 



Eibble, Dee, and Mersey, denudation 

 of the Low- level Marine Boulder- 

 clay of the, 291. 



Valley, Stockdale Shales in, 



706. 



Eio Tinto, comparison of ore deposits 

 of, with those at Sudbury, Canada, 

 836. 



Eoberts, Mr. T., award of one moiety 

 of the Lyell Geological Fund to, 

 Proc. 39. 



