142 RESEARCH IN CHINA. 
part of the Cambrian sequence. The Man-t’o shale is represented here 
by several hundred feet of red shales, sandstones, and sandy shale. The 
lower portion of the Ki-chéu consists of thin-bedded gray and greenish 
limestones and shales. ‘The limestone is locally oolitic and fossiliferous. 
More massive barren limestones of gray color form the higher section. 
At the head of the Shi-t’ou-ho canyon a much-faulted syncline of 
the lower part of the Sinian is overthrust upon the dark upper limestones 
which form the precipitous walls of the gorge (Fig. 37). 
NW 



Sy 
Hy ils 
) 
| 
thy 1\ Ke Sse anil 
ex tH ie cy ib 
tll i! i IN Ate wt 
B ipl: 1000 FEET 
Fic. 35 (Willis. Atlas sheet CI, section BB).—T6u-ts’un, Shan-si. Lower Sinian (Cambrian) strata 
overthrust by Hu-t’o (Algonkian) limestone, 6 miles, 9.5 kilometers, east of Téu-ts’un. 







aS ~ Pia If 
a») Nee ie : 
f ETD Ai 
(/, ny apa dN 
Pa par ore ay, nen 2 
Nes we BR fio Tan een 
/, sce a 
/ ae ex =< STU = smug on THEM 
- rian OA (erry rm, 
f (C ZA aa Git Wei emit meetin meen vn 
‘mul 
Fic. 36 Citi eee of overturned syncline in Ki-chéu (Cambro-Ordovician) limestone, 
in the mountains east of Téu-ts’un, Shan-si. 
/ SY Lae 4 
/ 7a = ring Tuts Ta 

In the next valley southwest, which heads in a wind gap in the front 
range, the Cambrian sequence is better exposed (Fig. 22). At the base 
a conglomerate and sandstone cemented with hematite lies overturned 
beneath the Tung-yii (Algonkian) limestone. The pebbles are composed 
of jasper, quartzite, and flint, from the older rocks. This richly ferrugi- 
nous stratum is followed by red, brown, and green shales and thin gray 
limestones, composing the Man-t’o formation. The lower shaly limestones 
of the Ki-chou group come in over them with characteristic features. 
