SUMMARY. 
67 
3. A thick series of limestone, slate, shale and quartzite — the 
Dothak series — which forms the hills to the south 
Dotbak Series. . . 
of the Phari plain represents a part at least of 
the Trias and may possibly include also older systems, but the paucity 
of fossils and the poor state of preservation of those found, have 
afforded no evidence as to the age of the lower beds, but some lime- 
stones at the top of the series contain brachiopods which are regarded 
as of liassic age. 
4. The greater part of the provinces of 1 sang and U is covered 
by Jurassic rocks. The lower beds contain few 
Jurassic System. 
fossils, but highly fossiliferous limestones of 
middle Jurassic age, with Trigonia costata Park, and species of 
Harpoceras, were found to the south of Kampa dzong, and fossili- 
ferous representatives of the Spiti shales occur at Kampa dzong and 
in the hills to the east and south-east of Gyantse. 
5. A comparatively narrow strip of Cretaceous and Tertiary rocks 
— the Kampa series — runs from Kampa dzong 
Creta'^rus^nd'terfiary. ^o Tuna. The Cretaceous rocks are shales, 
limestones, and sandstones, and represent the 
whole of that system. The lowest fossiliferous horizon is of 
cenomanian age and contains Turrilites costatus Lam. and Acantho- 
ceras rhotomagense Defr. The turonian, and probably part of the 
senonian, stage is represented by Rudistae limestone, with Radiolites 
sp. The inaestrichtian is represented by limestone with Cyclolites 
regularis Leymerie, Hemipneustes sp., and Lithothamnion. A thick 
bed of coarse, ferruginous sandstone may be of either Cretaceous or 
Tertiary age. The Tertiary system is represented by gastropod-bear- 
ing limestone, overlain by shaly foraminiferal limestone with Velates 
schmideliana Chemn. This is followed by shale, with Spondylu^ sp., 
overlain by Orbitolites limestone. Still higher in the series is a 
band of richly fossiliferous Alveolina limestone. The youngest of 
the rocks of the Tertiary system is a dark shale ('' Dzongbuk shale 
apparently unfossiliferous. The whole series from the ferruginous 
sandstone up to the Dzongbuk shale is probably of eocene age ; 
( 188 ) 
Fa • ] 
