CAMBRIAN SYSTEM. 
15 
Brought forward about 400 feet. 
12. Siliceous slates and flaggy quartzile . . „ 30 „ 
II. Siliceous and argillaceous slates, with trilo- 
bites ....•••» 6 
10. Grey slaty quartzite, capped by dolomite (6") „ 50 „ 
9. Slates, siliceous above and argillaceous below, 
with trilobites . . . . . • » 3^ »> 
8. DarU-grey quartzite . . . . . „ 60 ,, 
7. Pink shaly dolomitic limestone, with trilobites „ 12 „ 
6. Calcareous quartzite, with Lingulella and tri- 
lobites, underlain by narrow band of fos- 
siliferous limestone (2") and argillaceous 
slates, with many trilobites . . . „ 10 „ 
5. Grey micaceous quartzite, with thin bands 
(^" to 2") of mica schist . . . . „ 150 „ 
4. Slates, alternating with narrow bands {\" to 
4") of grey limestone, with Lingulella and 
trilobites . . . . . . „ 10 „ 
3. Slate, chiefly siliceous, and quartzite . . „ 150 ,, 
2. Dark slate, with trilobites . . . • » 30 „ 
1. Red and green slaty quartzites, with Lingulella 
and trilobites in the uppermost bands . „ 250 „ 
1,188 feet. 
The thickness of the individual suh-divisions as given in the above 
list is in most cases merely approximate, for the whole series is dis- 
turbed by faults and no really consecutive section can be found. 
The lowest horizon at which fossils were found occurs near the top 
, . of the reddish quartzites (No. i), which overlie 
Fossiliferous horizons. , , . , , 
the bright red slate series. The rock from which 
they were obtained is a hard, calcareous and micaceous quartzite, 
containing numerous valves of a small brachiopod resembling Lingu- 
lella ; with these are associated fragments of the head-shields of a 
trilobite, too badly preserved, however, for even generic determina- 
tion. Above this are flaggy quartzites, in thin beds, the surfaces of 
which are covered with impressions resembling those ascribed by 
Nathorst to the tracks of invertebrate animals.^ The same markings 
are common in, and characteristic of, these quartzites throughout Spiti. 
» Kong. Svensk. Vet. Akad. Handlingar ; Bd. XVIII, Bd. XXI. 
( 15 ) 
