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RESEARCH IN CHINA. 
south of the city of Hin-chdéu, in the base of the Ki-chéu-shan southeast of 
that city, and more extensively along the northern base of the Wu-t’ai 
range. 
cult to distinguish it from other metamorphic rocks of later age. 
The complex probably appears in other localities where it is diffi- 
On these 
rocks our most extensive observations were made between T’ang-hién and 
Foéu-p’ing-hién, Chi-li, where the complex is distinct from all the younger 



formations. 
CLASSIFICATION OF THE ROCKS OF CHI-LI AND SHAN-SI. 
| Formation. Character. Period. 
River gravels and sands. Generally coarse deposits, mostly ) 
of sand. | Pleistocene 
t and 
Huang-t’u formation. Chiefly loess, with notable | Recent. 
amounts of sand and gravel. J 
Dikes. Quartz-porphyries. Post-Paleozoic. 
Shan-si formation. Sandstone and shale, with numer- Carboniferous. 
ous coal beds. 
Unconformity. 
Ki-choéu limestone. Gray to brown massive and thin- ] 
bedded limestone. Cam bro- 
Ordovician. 
Man-t’o shale. 
Ta-yang limestone. 
Tung-yii limestone. 
Tou-ts’un slate. 
Si-t’ai schists. 
Nan-t’ai schists. 
Shi-tsui schists. 
Augen-gneiss. 
Pei-t’ai gneiss, 
Metamorphosed intrusives. 
T’ai-shan complex. 

Red shale and sandstone, with 
local basal conglomerate. 
Gray siliceous limestone, with 
abundant chert. 
Gray siliceous limestone, inter- 
bedded with gray to purple 
slates. 
Gray to purple slate, with beds of 
limestone, quartzite, and con- 
glomerate. 
(Chloritic and allied schists, with 
coarse conglomerate of quartzite 
and granite pebbles.) 
(Marble, quartzite, and jasper with 
chlorite- and biotite-schists.) 
(Arkose, quartzites, complex mica- 
schists, and amphibolites.) 
Quartz, feldspar, and biotite, con- 
stituting a massive uniform rock, 
probably intrusive. 
Quartz, feldspar, muscovite, and 
chlorite; possibly of sedimentary 
origin, and if so, the youngest 
member of the Wu-t’ai system. 
Granite, biotite- and homblende- 
schists. 
Gneisses of heterogeneous com- 
position and intricate structure, 
forming a basal complex. 
| (Sinian system.) 
Unconformity. 
; 
| Neo-Algonkian. 
(Hu-t’o system.) 
|| Nore: The Ta-yang limestone is 
f probably equivalent to the Tung-yii 
| and Téu-ts’un. 
Unconformity. 
Eo-Algonkian. 
(Wu-t’'at system.) 
> Notre: The stratigraphic relations of 
these divisions are not positively 
determined. 
} 
| 
Unconformity. 

Unclassified 
Pre-Cambrian. 

J 
Archean, 

