A list and index of papers on Himalayan Geology and Microscopic Petro- LIST OF PAPERS. 1. The Blaini group and the "Central gneiss" in the Simla Himalayas 2. Notes of a tour through Hangrang and Spiti . 3. Note on the Section from Pangi via the Sach pass 4. The Geology of Dalhousie 5. The Traps of Darang and Mandi 6. The Geology of Chamba 7. The Basalts of Bombay 8. On the microscopic structure of some Dalhousie rocks 9. The Lavas of Aden 10. On the altered Basalts of Dalhousie II. On the microscopic structure of some Sub-Himalayan rocks of tertiary age 12. The Geology of Chuari and Sihunta 13. On the microscopic structure of some Himalayan Granites and Gneissose 14. On the microscopic structure of some Arvali rocks. 15. Fragments of slates and schists imbedded in the Gneissose Granite of 16. Further Notes on the Geology of Chamba 17. Notes on the Section from Simla to Wangtu . 18. On the microscopic character of eruptive rocks from the Central Hima. 19. The microscopic structure of the Maláni rocks of the Arvali region 21. On the microscopic structure of the Rajmahal and Deccan traps . 23. Pressure metamorphism with reference to the gneissose-granite Aden, lavas of Alps: the geological history of the Alps and Himalayas compared Satlej valley Bhandal "" ,, Rajmahal group "" "" • Amygdules, pseudo, formed by infiltration of acid water through a glassy base INDEX. Hulh "" Andesite, suggests that the term should be restricted to the lava form of diorite " "" "" Beryl in Satlej valley granite microscopic stucture of 39 Bhond sandstones, microscopic stucture of red clays, microscopic structure of. "9 Biotite of eruptive rocks compared with that of rocks of clastic origin "" in gneissose granite, instances of crumpling due to traction Blaini limestone, is a magnesian limestone rests on the Blaini conglomerate the pink coloured variety passes into blue conglomerate below Patanala altered by infiltration of water along cracks in form of acicular microliths (altered) of the Bhandal area of Bombay (altered) between Chuari and Sihunta " Bombay, basalts of · Boulder of granitoid gneiss in the upper silurian conglomerate "" at other places and inferences therefrom suggestive of glacial action at Sihunta series below Chepal "" Cambrian series possibly represented in the Dalhousie area 19 " "9 Cavities-see Glass and Stone. at Simla Sanj 19 • passes into a rock resembling a quartzite "" " east of Chuári Carbonaceous slates at Dalhousie exhibit hypo-metamorphism near the metamor gneissose granite Carbonaceous slates at Dalhousie correlated with the infra-Krol of Simla area Delhi quartzite liquid, with moving bubbles in quartz of Aden trachytes veins in felsite X, 204 "" XVI, 42; XX, 107, 110 XVI, 37, 41 XII, 66; XVIII, 81 XVIII, 80, 81 XVII, 36 XV, 40 XV, 36 XIV, 306 XVI, 190 XVII, 34 X 204, 206,207 73 XVIII, 96 19 XIX, 119 in secondary calcite epidote XIX, 74 secondary liquid cavities not distinguishable from primary cavities. XIX, 119 XVI, 146 XV, 158 XV, 158 XVI, 44 XVI, 187 XVI, 145 XVIII, 94 XVI, 42 XVII, 34 XVIII, 96 XVIII, 100 X, 219 XVII, 58 XVI, 186 XVI, 187 XVII, 68 XVI, 133 X, 210 X, 207 X, 211 XVI, 153, 158 XV, 161; XVI, 179 X, 211 X, 205 X, 210 XV, 36 XV, 36 XVII, 59 XVII, 105 Cavities (liquid) abundant in the gneissose-granite up to point of contact with adjacent rocks. Cavities (liquid) absent from the schists in contact with the gneissose-granite. absent from the fragments of rocks included in the gneissosegranite absence in above cases, due to contact action in microliths in gneissose-granite " " Chepal Chemical analysis, difficulties in the way' of accuracy, illustrated by micro scope Chiastolite schists near Chango at Tusham Central gneiss, see gneiss. Chamba, notes on the geology of-XIV, 305; XV, 34; XVI, 35; XVII, 34; XVIII, " Chini Chlorite, viridite passing into vermicular chlorite pseudomorphic after garnet 11 Chor, diorite of Chuari, geology of Conglomerate (Blaini) at and round Simla in Chamba area " " ". (river) at Balori "" 19 Dagshai group at Bhond "} in Spiti. Cooling, evidence of rapid, in an igneous rock 91 produces mineralogical and structural changes Cracks in minerals sometimes due to cooling Crinoidal limestones on Chandan Namo Pass and neighbourhood probable age of. resemblance to a boulder bed of ice origin • 13 sandstone, microscopic structure of Dalhousie, geology of. " rocks, microscopic structure of section from, to Pangi Darang traps, microscopic structure of Deccan traps, microscopic structure of compared with Rajmahal traps Delhi quartzite microscopic structure of Denudation of Himalayas, rate of, discussed · Crystallization cramped by contemporaneous formation of other crystals in a quartz trachyte from Aden X, 204-214 XIV, 306–310; XVI, 37–42; XVIII, 83—110 correlated to Blaini conglomerate apparent thickness of, due to isoclinal folding . XVI, 141; XVII, 172 . XVI, 141 XVII, 172 XVI, 141, 142 XVI, 130 XVI, 149 xii, XVIII, 80 . XII, 63, 64 XVI, 45, 47, 50, 179, 180 XVI, 137; XVII, 172 XVI, 141; XVII, 172 X, 222; XV, 157; XX, 113 XIV, 309; XVI, 40 XVI, XIV, 306 XIV, 307 XVIII, 106-109 79 X, 219 X, 209 XVI, 131, 142, 191; XVII, 65 XVI, 151 X, 221 XV, 160 XVII, 62 XX, 112 XVII, 34 XIV, 309 XIV, 307 .XVIII, 80 XV, 34 XVI, 129, 178, 186; XVII, 64, 168; XVIII, 93 XIV, 305; XVIII, 101 XV, 155 42; XX, 107 XX, 104 'XVII, 103 XII, 66 XVI, 35 XVI, 188 19 19 11 Satlej valley Felsites of Bhandal Maláni Tusham. " foliation of, due to pressure metamorphism intrusive in nummulitics " of Narkanda of Rajmahal group 33 Felspar (triclinic), albite macles so arranged as to resemble Carlsbad twins fibrous variety opacity sometimes due to gas and air pores 19 Fluxion structure in basalt porphyry of Chamba area. Felsites of Tusham " " " " the gneissose-granite. in granite. in the quartz trachytes of Aden 19 19 ". Foliation, cases of, in rocks of undoubted eruptive origin 19 of Dalhousie gneissose-granite not due to pressure metamorphism Foliated diorites of Satlej valley diabase in Bhandal valley Garnets, feeble double refraction in some felsites of Maláni "" Fragments of slates and schists imbedded in gneissose-granite Gaur, image stones Gaora, rocks at with well defined crystallographic outline in granite containing fluid cavities with moving bubbles in the trachytes of Aden "" Glaciers, evidence of ancient, in neighbourhood of Dalhousie in the Pangi valley XVII, 101 XVIII, 81 XX, 106 XIX, 115 X, 213; XIX, 85 XV, 35, 36, 39, 49; XVII, 35; XVIII, 106-108 "" pseudo evidence of, on skirts of Himalayas 33 Glassy base included in felspars at time of crystallization XIX, 165 XVI, 132, 134, 140; XVII, 65, 66; XVIII, 80 xvi, XVII, 54 XVI, 152 XVIII, 103 XVIII, 95 XIX, 161 XVII, 108 XV, 159 XVI, 131 ib. XVIII, 96 XVII, 109 ib. XVII, 56, 62 XVII, 61 XVII, 62 XVI, 134; XVIII, 80 XVI, 149, 152, 153, 157 XV, 49; XVIII, 87 XX, 203 XIX, 80-85 XVI, 36 XVII, 168 XVII, 71 XX, 43 XIX, 69 XIV, 310 XII, 66 XVII, 36 XVI, 181 XVI, 42, 43 Glass cavities, evidence of the volcanic origin of a rock in sanidine in Aden trachytes base, enclosed in felspar crystals, evidence of rapid cooling Globulites or rounded discs of quartz in granitoid quartz porphyries of augite "" Globular silica in Aden trachytes Gneiss, central, see gneissose-granite. Gneissose-granite, term substituted for "granitoid gneiss" and "Central gneiss" bed. outcrops described. 、 pseudo bedding due to jointing probably of tertiary age exposed when the Siwaliks were deposited foliation of, not due to pressure metamorphism. Stratigraphical evidence of eruptive origin. contact metamorphism produced by it sends tongues and veins into adjoining rocks . Hangrang Hattu Hæmatite in dendritic forms Himalayas, gradual and continued rise of central, eruptive rocks of history of, briefly indicated Granitic intrusion into Himalayan area not limited to one period of Pangi (Chamba) "9 93 Granite, eruptive, in neighbourhood of Narnoul in Satlej valley at Tusham "" "} Granite porphyry shades into quartz porphyry Gya image stones Hulh, valley of Hornblende andesites of Hulh appears at different horizons contains veins similar to those attributed to shrinkage on cooling in granites of admittedly eruptive origin contains foreign fragments imbedded in it .XVI, 143; XVIII, 103 X, 204; XII, 61; XIV, 308; XV, 44; XVI, 38 XX, 204 microliths with shrinkage cracks X, 222; Microscopical evidence of igneous origin. was made plastic by hydro-thermal agencies contains microliths with contraction cavities X, 222; XVI, 140; XVII 69 X, 222; XVI, 130, XVII, 60, 65 XVI, 132, 133, 140; XVII, 66; XVIII, 80 contains "stone cavities" with endo minerals X, 222; XVII, 66; XVIII 80 displays fluxion structure opacite embracing previously-formed microliths XV, 41; XVI, 141, 142 XVIII, 105, 106; XIX, 87 XVIII, 103 XV, 49; XVII, 168 X, 223; XVII, 59, 60, 63 XVII, 60, 64, 69 XVI, 132, XVII, 59; XVIII, 80 XVI, 191 XII, 60, 62 XIV, 305 XVII, 102 X, 218, 219, 221; XII, 57; XIX, 70, 71 · XVII, 111 XVII, 117 XVII, 102 XX, 43 XVII, X, 217; XVII, 60, 68; XIX, 66, 86 XVI, 36 XVIII, 99 |