Hornblende schists of the Chor and Simla areas

Satlej valley

99 99

embryonic condition of, in Aden trachytes Hundes, diorite intrusive in nummulitics Hutchinson, Dr, on geology of Pangi Ice, silurian conglomerate attributed to ice action action in neighbourhood of Dalhousie Ilmenite in some cases a secondary mineral Image stones

XX, 116
X, 218, 219; XIX, 65
XVI, 151, 154
XIX, 118
XVIII, 90
XIV, 307
XV, 49, 50
XX, 115
XX, 43
XV, 49

XVII, 168
X, 208

Inclusions in the granitoid gneiss

""

in granite Infra-Krol, variations in thickness Jako rocks

Jangi

Jubal

Kajiár commonly mistaken for a crater
Káli Cho valley

Kasauli plant bed, microscopic character of

""

Mahasu

Malani rocks, microscopic structure of .

Mandi, traps of .

Markhar, river Ladak, eruptive rocks of
Mattiana

39

Magnetite, skeleton crystals of, characteristic of volcanic rocks and slags

dendritical forms of, in Aden trachytes.

of Chango and Chandan Namo Pass
crinoidal

in Hangrang Pass and Hango

in Pangi (Chamba)

X, 212, 213; XII, 65; XIV, 305; XV, 36; XVII, 34; XVIII,
79; XIX, 85
XII, 61
XIV, 306; XVI, 40
XII, 58-60

Mica, cryptocrystalline variety described

XVII, 101 XVIII, 87 XVI, 186 187 XVI, 35

XV, 35
XVII, 113

X, 217; XVII, 59; XIX, 66, 69
X, 214; XIX; 66, 69, 86, 88
X, 219, XII, 60

Melaphyre, reasons for discarding the term
Metamorphism, extent of, a general test of age

contact, changes produced by

of the Dalhousie gneissose-granite not due to heat as a pro-
duct of pressure

not caused by plutonic heat
pressure. Some remarks on
cause of

·

.XV, 47; XVI, 143; XVII, 68, 71; XVIII,
of some silurian and carboniferous rocks may have been pro.
duced by heat as a product of tangential pressure

resulting information of hydro-mica schists does not require
the agency of great heat,

XIV, 308

308; XVIII, 90, 92 XV, 160 XVI, 148

X, 211 XIX, 161

XIX, 115
XIX, 118

XV, 155 XIX, 115

X, 211, 214; XIX, 86

.XVI, 184 XV, 42 XVI, 137, 141, 142; XVII, 172

XV, 39, 45, 46

XV, 46, 47

XX, 203

102; XX, 203

XVI, 143; XVIII, 84, 85

XVI, 131, 132

Mica, in dolerite sometimes a secondary product

Microcline, abundant in the gneissose-granite of Dalhousie

Microliths of silvery mica

"

XX, 115

XVI, 133; XVII, 169

XVI, 133; XVII, 70
XV, 158, 159

XVI, 130, 131; XVII, 64
XVI, 131

•

shrinkage cavities in, an evidence of heat X, 222; XVI, 130, 149; XVII, 60, 64, 69

quartzite

XVI, 104 XVII, 65

""

Moraine, see Glacier.

Nahan sandstone microscopic structure of .

points of difference between mica in rocks of eruptive and sedimen.
tary origin

crumpled from strain and traction.
pseudomorphs after augite

Nummulitics caught up in a fold of the Blaini

Olivine, gerneally absent in Deccan and Rajmahal traps

how far its absence affects the classification of a rock

"

containing liquid cavities.

Pabar valley

Pangi (Satlej valley)

""

Organic structures simulated in granite

Orthoclase, fibrous variety referred to microcline

presence of, not to be expected in highly altered rock
black, similar to that in the Scotch peridotites

cracks in, caused by strain at time of cooling.

""

Opacite formed on microliths common to Aden lavas, and gneissose-granite of

Himalayas.

deposited in glass cavities

•

in granules represents magnetite imperfectly crystallised

19

Simla, geology of

Puga, eruptive rocks of

Shali peak
Shankan ridge

Sihunta, geology of

•

Silurian series in the Dalhousie area

(Chamba valley)

$

Parallelism of structure in granite due to traction acting on a partially cooled

mass Paunda .

Peridotites of Central Himalayas

Plagioclase, dusty appearance of borders of

Porphyritic trap of the Bhandal area

conglomerate, see Conglomerate.

slates, of silurian age

to Wangtu

.

"3

Sirmur series, evidence of microscope as to their origin

at Bhond.

cut off by fault south of Chuari
microscopic structure of

XVI, 149; XVII, 59

XVII, 63
XV, 160

XVII, 55
XVI, 131

X, 219
XII, 57

XIV, 305; XVIII, 90

XVI, 143; XVII, 68, 71; XVIII, 102

X, 218 XIX, 115 XVI. 154

XVI, 40; XVIII, 83, 96

XVI, 190

XVI, 35

XV, 36; XVII, 35

XVI, 186

XX, 105

XX, 203

XIX, 115

X, 211, 214

X, 215

XVII, 34

XV, 40

XVI, 188

Siwalik sandstones, microscopic structure of
Slates, fragments of imbedded in granite

XVII, 168
XVI, 133

microscopic structure of

'effects of contact metamorphism on

39

effects of regional (?) metamorphism on Sodium chloride deposits in liquid cavities Spiti, notes of a tour through

Stone cavities in felspar of Bombay basalts

a characteristic of igneous rocks

in gneissose-granite

in granitoid gneiss of Dosi

in granite of Himalayas

in the sanidine of Aden trachytes

"

Strain, evidence of, in gneissose-granite of Himalayas

"

19

Thiog

•

Pumice of Aden

Quartz in globular discs

..

""

eruptive granite of Himalayas Stratigraphy of the Dalhousie area

Simla and Satlej valley section

..

Sungri.
Taranda
Taroche

"

compared with ground-mass of quartz por-
phyry

Quartz-diorites of Satlej valley

Quartz-porphyry of Arváli series
Quartz-trachytes of Aden

XVII, 108, 109
XVI, 133–142; XVII, 168
XX, 45

XVII, 103, 115
XII, 57
XVI, 43

X, 222; XVII, 56, 69

X, 222; XVI, 130; XVII, 59, 62, 63, 67, 69; XVIII, 80
XVII, 103
XVII, 54, 55, 69

XVI, 148, 151, 152, 156, 157; XVII, 71
XVI, 130, 133, 143; XVII, 62, 65,

66, 70; XVIII, 80, 104

XVII, 68 XVIII, 101 XIX, 85

X, 218 X, 218 X, 209 X, 211 XVI, 156

XVII, 111, 112

. XVI, 145, 153, 154 XVII, 63 XVI, 130;

“globular" in the Aden trachytes of granite, some characteristics of

polysynthetic structure of, characteristic of the gneissose-granite of

Quartzites of Delhi, microscopic structure of
Rajmahal traps, microscopic character of

""

and Deccan traps compared Rampore traps

Rivra conglomerate near Chango

in Chamba

on the Satlej

Dalhousie

in eruptive granite

in quartz-porphyry

residual in quartz-trachytes of Aden

of secondary origin full of liquid cavities with moving bubbles

"

Rupin Pass

Sách Pass

Satlej valley amphibolites and quartz-diorites granite and gneissose-granite

"'

91

Sand, wind laden with, an agent of erosion
Sangla

Sanidine, dusty appearance along borders of
Sarhan

XVI, 130; XVII, 64; XVIII, 80

XVII, 54, 68

XVII, 110

XVI, 151

XV, 160, 161; XVI,

X, 215; XIX, 67, 68, 72, 79

XII, 66; XVIII, 81

XVIII, 80

XVIII, 81

X, 219

XIV, 307; XVIII, 100

XIX, 65

X, 218-221; XVII, 53; XIX, 65

XVII,

XVII, 101
X, 218

XVI, 148, 151, 154

xvi,

X, 218, XIX, 69

Schists, fragments of, imbedded in granite.
Schorl, reheating of after crystallization.

Section (diagrammatic) of Himalayas from Dalhousie to Sách Pass

99

,, Chanjú Himgirl to Digi.

"1

19

Trachytes of Aden
Traction, evidence of, in gneissose-granite of Himalayas

XV, 148

XVI, 132-134, 140; XVII, 65,
66;
XVIII, 80
XVI, 134, 135, 142

Tourmaline, evidence of, reheating after crystallization
Trap of Chamba-Dalhousie area XV, 34; XVI, 36, 39–41; XVII, 34; XVIII, 82-86, 89
microscopic characters of
99 " age of

XVI, 178; XVIII, 93

. XV, 34, 37; XVIII, 92; XIX, 81

""

Central Himalayas

39

Spiti
Tusham

39

Tridymite in Aden trachytes
Tuff, see Volcanic Ash.

Tusham, rocks of.

Chor mountain

Darang and Mandi

Deccan

Maláni

Rajmahal

Satlej valley

correlation with Maláni rocks suggested Unconformity, apparent, produced by tangential pressure Volcanic activity connected with history of the Himalayas Ash, Chamba-Dalhousie area

microscopic examination of

Satlej valley.

Central Himalayas

""

"

Viridite passing into vermicular chlorite
Wangtu, section from Simla to
Zircon in some Dalhousie rocks

ADDITIONS TO THE MUSEUM.

FROM IST OCTOBER TO 31ST DECEMBER 1886.

A series of 16 specimens in mahogany case, illustrating the extraction of copper from cupreous pyrites.

PRESENTED BY THE THARSIS SULPHER & COPPER Co., LD., GLASGOW. Nine specimens of minerals from different localities in England.

PRESENTED BY THE BRITISH MUSEUM. Specimens of magnetite and limonite and steatite from Gangai, Jabalpur district. PRESENTED BY MR. C. W. McMINN, C.S.

Titles of Books.

Donors.

ALLEN, Alfred H.-Commercial Organic Analysis, 2nd edition, Vol. I. 8° London, 1885.
BALL, Valentine.-Observations on lion-breeding in the gardens of the Royal Zoological
Society of Ireland. 4° Pam. Dublin, 1886.
THE AUTHOR.
BECKER, George F.-The Washoe Rocks. 8° Pam. San Francisco, 1885. THE AUTHOR.
DABNEY, Charles W.-Methods of analysis of Commercial Fertilizers. 8° Pam. Wash.
ington, 1885.
REVENUE & AGRICULTURAL DEPARTMENt.
DESLONGCHAMPS, Eugène Eudes.-Notes Paléontologiques. Vol. I. 8° Paris, 1863-1869.
J. WOOD-MASON.
EMMONS, S. F., and BECKER, George F.-Statistics and technology of the precious metals.
4° Washington, 1885. REVENUE & AGRICULTURAL DEPARTMENT.
EXHIBITIONS.-Allgemeine Landes-Ausstellung zu Budapest, 1885. Special-katalog der
VI-ten Gruppe für Bergbau, Hüttenwesen und Geologie. 8° Buda-
pest, 1885.
'ROYAL HUNGARIAN GEOLOGICAL INSTITUte.
Die Königlich Ungarische Geologische Anstalt und deren Ausstellungs-
Objecte. 8° Budapest, 1885.

ROYAL HUNGARIAN GEOLOGICAL INStitute.
Colonial and Indian Exhibition, London, 1886. Descriptive catalogue
of a collection of the Economic Minerals of Canada by the Geological
Corps. 8° London, 1886.
GEOLOGICAL SURVEY OF CANADA.

Official catalogue. 2nd edition. 8°

Colonial and Indian Exhibition.
London, 1886.

99

ADDITIONS TO THE LIBRARY.

FROM IST OCTOBER TO 31ST DECEMBER 1886.

Colonial and Indian Exhibition, 1886.

Empire of India. Special

catalogue of exhibits by the Government of India and private exhibitors. 8° London, 1886. GANNETT, Henry.-Report on the building stones of the United States, and statistics of

the quarry industry for 1880. 4° Washington, 1883.

REVENUE & AGRICULTURAL DEPARTment.