THE KAMPA SYSTEM. 
41 
superficial extent of this series is small, it is probably less so than 
would be supposed from the map, for it is quite possible that it may 
occur among the hills between the Nyang Chu and the Yaru plain, 
and where the local rocks are highly metamorphosed, as in the 
country around Gyantse, some of the calc-schists mapped as Jurassic 
may include in-folded patches of Cretaceous beds. 
The chief exposures of the Kampa system are found along a band 
running from Kampa dzong to Tiina and forming 
Giri limestone. 
a series of more or less faulted folds trend- 
ing approximately E.-W. The oldest member appears to be a band 
of hard thin-bedded limestone which dips to the north and forms a 
small ridge at about 7 miles to the E.S.E. of Kampa dzong and a 
short distance from the southern flanks of the Kampa-Tatsang range. 
No fossils were found in the limestone, which, however, immediately 
overlies the Spiti shales and is therefore probably of lower Cretaceous 
age. A similar series of limestones is seen again on the banks of 
the Giri river about 3 miles above Giri, faulted under the Spiti 
shales and dipping at high angles to the south (PI. 8, fig. i).-' On 
the right (north) bank of the stream it is faulted against the 
Jurassic shales and sandstones. 
The overlying beds consist of a series of brown shaly limestone 
with brown and black needle shales. Through 
Kampa shales. 
the shales are narrow bands of concretions of very 
hard splintery limestone, which, between the village and the monastery 
at Kampa dzong contain cephalopods of the general type of Acanthc- 
ceras rhotomagense Defr. and appear to include 
A, Newboldi Kossmat, 
A. Hunter i Kossmat, and 
A. laticlavium Sharpe ; 
in addition to these they contain specimens of Turrilites, including 
T. costatus Lmck. and 
T. cf. circumtgsniatiLS Kossmat. 
' For convcTiience of reference this band may be termed the " Girl limestone." 
( 162 ) 
