CARBONIFEROUS SYSTEM. 
37 
Thickness. 
brown band represents the weathered ?ilurian limestone, above which 
the white Muth quartzite forms an equally striking horizon. 
The total thickness of the succeeding limestone and quartzite 
series is probably almost 2,000 feet; the section 
was measured from the top of the Muth quartzite 
up to the camping-ground of Tak-ra-chen, which is a little below 
Tanga, but owing to the physical difficulties involved, the following 
measurements are only approximate : — 
" Po series " of shale and quartzite, 
7. Yellow and buff limestone. Dark, flaggy limestone, hard 
and splintery . . . . . , . . j 
6. Limestones, with thin bands of soft shale ; fossiliferous") 
horizons occur at the following heights above the white 
quartzite No. 5 
Grey shale ( horizon g), 372 feet above No. 5 
500 feet. 
Limestone ( „ / ), 303 » » 
Shale ( „ e), 263 „ 
Limestone ( „ 188 „ „ 
Shale ( „ c), 123 „ „ 
Shale ( „ b), 117 „ 
Flaggy ■) ( „ a ), extending from 12 feet to 
limestone. ) 37 feet above No. 5 . 
5. White quartzite ........ 
4. Hard, dark limestone, containing apparently only crinoids 
3. White and grey quartzite, with purple slates and subor- 
dinate bands of flaggy limestone ..... 
2. Limestone, weathering yellow and reddish-brow n 
I. Hard, dark grey and black splintery limestone in beds of 
from 2 feet to 4 feet thick, with coral bands at 283'— 4', 
262-5', 152'— s', 95-97' 
!• 372 
25 
185 
224 
131 
360 
Total thickness 
1,797 feet. 
Muth quartzite. 
The lowest subdivision (No. i) of the above series has already 
Fossiliferous been described. With the exception of the bands 
horizons. corals, no fossils were found in it between 
the Lipak river and Tak-ri-chen : sections of brachiopods were seen 
in the rock, but nothing could be extracted. On the opposite side 
of the ridge at about 1,000 feet above the Yulang river, the fossils 
( 37 ) 
