STRATIGRAPHY OF CHI-LI AND SHAN-SI. 
149 
From our brief examination it is not practicable to estimate the 
thickness of this sequence, except 
to say that more than 4oo feet, 120 
meters, of strata are included. The unconformable relation of the under- 
lying limestone has already been described; owing to the position of the 
coal-measures in the axial trough of the syncline, the upper limit of the 
section is an eroded land surface. 



ae 
YGULGELLIL LE 
typ 
GUE EYL 02 
SLEELALEELL AG: 
YG Hy Wiley 
QGOLGL: ig CLO Cif P 
SO FEET 









SLL: 


Fic. 43 (Blackwelder).—Mi-chéng, Chi-li, atlas 
sheet F I. Basal shales and coal-seam in the 
Shan-si series (Carboniferous) overthrust by 
Ki-chéu limestone. a@ = Ordovician lime- 
stone; 6 = dark shale; c = coal-seam; d = 
gray and buff shale and thin sandstone; 
e= soft gray limestone. 
of the general denudation of the region. 
At Mi-chéng (atlas sheet F I) 
less than half of the Ning-shan coal- 
measures remains in a synclinal trough 
(Fig. 43). The only lithologic peculi- 
arity which this section presents is the 
existence of a 2-foot, 0.6-meter, layer of 
pearl-gray marly limestone in the coal- 
bearing gray and buff shales. This 
field is cut off by a small thrust-fault, 
which brings the dark Sinian limestone 
up over the shales from the northwest. 
The third exposure, west of Mi- 
chong, is only a vestige in consequence 
Nothing now remains of the 
coal series but a few feet of the yellow and gray shales, which form the 
base of the formation. 
It is scarcely worthy of mention, except for the 
fact that it affords a view of the Pre-Carboniferous unconformity. 
T’ién-hua-Yau-t’ou coal-field, Shan-si.—These coal-basins lie in a 
single syncline, which has been deeply dissected by the canyons of the 
T’ai-shan-ho and its tributaries. 
1] nih 
PAE Ae sireeeeee 
HT HAS 
ard iN AN HTH PIES 
He ST 
DHL SSS 
i! 






° 
a ae ee SSS ae ISS 
SSS 
! LSS] SEES 
mS 
Most of the valleys penetrate into the 
SE 
SHI-PAN-K'OU 

LED 


SEES ESSE 

Fic. 44.—T’ién-hua, Shan-si, atlas sheet C I. 
Syncline of massive Sinian limestone containing a remnant 
of the Shan-si coal-bearing series (Carboniferous). 
limestone underlying the coal-measures. 
The basins occupy a dissected 
mountain upland, bounded by higher limestone ranges to the north and 
south—an upland which is characterized by rounded flattish summits, 
rising for the most part to a common level and sloping off into deep 
canyons. 
In the Yau-t’6u basin no complete section of the Carboniferous 
was measured, but the stratigraphy of the T’ién-hua field, Fig. 45, is essen- 
tially similar. 
At the base, upon the Sinian dolomite, lie pale-yellow, 
gray, and brown shales, which grade upward into variegated sandstones, 
