A list and index of papers on Himalayan Geology and Microscopic Petro-
logy, by COLONEL C. A. MCMAHON, F.G.S., published in the preceding
volumes of the Records of the Geological Survey of India.

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

11. 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
Granites

14. On the microscopic structure of some Arvali rocks.

15. Fragments of slates and schists imbedded in the Gneissose Granite of
the N. W. Himalayas

17. Notes on the Section from Simla to Wangtu

18. On the microscopic character of eruptive rocks from the Central Hima-
layas.

19. The microscopic structure of the Maláni rocks of the Arvali region
20. Note on Indian image stones

21. On the microscopic structure of the Rajmahal and Deccan traps
22. The dolerite of the Chor

23. Pressure metamorphism with reference to the gneissose-granite

Aden, lavas of.

INDEX.

Alps: the geological history of the Alps and Himalayas compared
Amphibolites of the Chor and Simla areas

Amygdules, pseudo, formed by infiltration of acid water through a glassy

base

Andesites of Aden

Andesite, suggests that the term should be restricted to the lava form of

Bhond sandstones, microscopic stucture of

red clays, microscopic structure of.

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

Boulder of granitoid gneiss in the upper silurian conglomerate
Boulders of river conglomerate on the top of Chandan Namo Pass
at other places and inferences therefrom
suggestive of glacial action at Sihunta
Cambrian series possibly represented in the Dalhousie area
Carboniferous limestone series at Dalhousie

XVI, 37, 41

XII, 66; XVIII, 81

XVIII, 80, 81

XVII, 36

XV, 40

Carbonaceous slates at Dalhousie exhibit hypo-metamorphism near the gneissose granite

Carbonaceous slates at Dalhousie correlated with the infra-Krol of Simla area
Carbon dioxide, liquified inclusions of, in Wangtu granite.

liquid, with moving bubbles in quartz of Aden trachytes
in secondary quartz in amygdules

XVII, 105

XVI, 153, 158

XV, 161; XVI, 179

XIX, 73 XVIII, 96

secondary liquid cavities not distinguishable from primary cavities.

XIX, 119

. XVI, 141; XVII, 172

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 gneissose-
granite

"

"

absence in above cases, due to contact action
in microliths in gneissose-granite

Central gneiss, see gneiss.

compared with similar cavities in

the microliths in the Aden Trachytes

XVI, 149

79

X, 219

X, 209

XV, 161; XVI, 47

Chamba, notes on the geology of—XIV, 305; XV, 34; XVI, 35; XVII, 34; XVIII,
Chansel Peaks

Chepal

Chemical analysis, difficulties in the way' of accuracy, illustrated by micro

XIV, 306–310; XVI, 37–42; XVIII, 83-110 correlated to Blaini conglomerate apparent thickness of, due to isoclinal folding

probable age of

resemblance to a boulder bed of ice origin

on Chandan Namo Pass and neighbourhood
at Bilaspur on the Satlej

Cooling, evidence of rapid, in an igneous rock
Contact metamorphism operates in two ways

XVI, 45, 47, 50, 179, 180 XVI, 137; XVII, 172 XVI, 141; XVII, 172 X, 222; XV, 157; XX, 113 XIV, 309; XVI, 40

produces mineralogical and structural changes
Cracks in minerals sometimes due to cooling
Crinoidal limestones

Crystallization cramped by contemporaneous formation of other crystals
Crystallites in Aden pitch-stones

Cryptocrystalline mica, a characteristic variety in the gneissose-granite

XVI, 45-48

XVI, 155

Dip, converging dip characteristic of Simla region accounted for
Disturbance subsequent to the sculpturing of Himalayas

XV, 35, 36, 39, 49; XVII, 35; XVIII, 106–108
X, 204, 205, 208, 214; XIX, 85, 86

Maláni

Felspar (triclinic), albite macles so arranged as to resemble Carlsbad twins

XIX, 67, 68, 86, 87

XVIII, 95

XIX, 161

XVII, 108

XV, 159 XVI, 131

ib.

Fluxion structure in basalt porphyry of Chamba area.

.

compared with that in gneissose-granite.

of Dalhousie gneissose-granite not due to pressure metamorphism Foliated diorites of Satlej valley

XX, 203

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

XVII, 111, 112

.XVI, 143; XVIII, 103

X, 204; XII, 61; XIV, 308; XV, 44; XVI, 38

pseudo bedding due to jointing

XVII, 35; XVIII, 79; XIX, 65

XV, 44; XVIII, 80; XIX, 66

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
XVII, 35; XVIII, 80, 103, and foot-note.
appears at different horizons

XVI, 192

XV, 34

XX, 204

XV, 41; XVI, 141, 142
XV, 44, 45; XVI, 133;

XVIII, 105, 106; XIX, 87

contains veins similar to those attributed to shrinkage on
cooling in granites of admittedly eruptive origin
contains foreign fragments imbedded in it

Microscopical evidence of igneous origin. was made plastic by hydro-thermal agencies contains microliths with contraction cavities

displays fluxion structure

. XVIII, 103 XV, 49; XVII, 168

X, 222; XVI, 140; XVII 69 X, 222; XVI, 130, XVII, 60,65 XVI, 132, 133, 140; XVII, 66; XVIII, 80 X, 222; XVII, 66; XVIII

contains "stone cavities" with endo minerals

Granitic intrusion into Himalayan area not limited to one period
Granite, eruptive, of Spiti

XVI, 132, XVII,

59; XVIII, 80