308 RESEARCH IN CHINA. 
of the rocks in the section, but it should be understood that they have no 
value as measures of the actual or original thickness of any of the strata, 
since they are greatly increased by folding and schistosity. Fossils were 
searched for, but not found. ‘This section ends abruptly against white 
felsitic aplite, associated with massive greenstone. The relation of these 
igneous rocks to each other is not known, but they are evidently intru- 
sive in the sedimentary series. 
ee - 
Rocks EXPosED IN THE HAN CANYON ABOVE SHI-TS’UAN-HIEN. 





Formation. Character. Width of Outcrop. 
Feet. Meters. 
Wu-shan formation. | Blue limestone and dark carbonaceous limestone. 600 180 
Northeastern limb | Spotted quartz-biotite-schists; presumably infolded 1,000 300 
overturned. K’ui-chéu. 
Bluish limestone, sericite-schists, and black coaly 300 100 
schists. Contains a dike of black amphibolite. 

K’ui-chéu schists; syn- | Soft green slates or schistose argillites with local 9,000 2,700 
clinal. gneissic quartzites. 
Wu-shan formation. | Blue-black slaty limestone, partially schistose. 
Northwestern limb | Quartz-mica-schist (50 feet). 2,600 780 
| much repeated by | Dark massive limestone, much contorted. 
folding. Mica-schist. 150 45 
Blue-black slaty limestone. 1,000 300 
Silvery gray biotite-schist. 100 30 
Blue-black flinty limestone, containing one thin layer 3,800 I, 150 
of coarsely crystalline white limestone. 




Shi-ts’ian-hién to Ts’ai-kia-kuan.—North of Shi-ts’iian-hién the con- 
ditions for observation of the rocks are less favorable than in the canyon 
of the Han. For 20 miles, 32 kilometers, until the P’u-ho is reached, the 
way is over low hills covered with vegetation. The soil is deep and the 
rock in the banks of streams usually decayed. Varieties of schists look 
alike, and the only rock of the Han system which is conspicuous is the 
blue-black argillite, limestone, or quartzite, which we later came to identify 
as of Wu-shan, Carboniferous, age. Along the P’u-ho the rocks are more 
strongly metamorphosed than on the Han; indeed, so much more strongly 
that we did not regard them as probably Paleozoic until we had reviewed 
our notes in the light of the Han section; and with the exception of a 
characteristic Wu-shan rock north of Ta-ho-pa, there are none which we 
can assign to a definite horizon in the Han system. 
The following paragraphs contain our observations en route, together 
with the inferences drawn from later knowledge of the stratigraphy. 
For a distance of 4 miles, 6.5 kilometers, north of Shi-ts’tian-hién 
the Han system is covered by the conglomeratic sandstones of much 
