STRATIGRAPHY OF SHAN-TUNG. 27 
these nodules contain numerous fossils, the most abundant being cranidia 
of Ptychoparia spp.: 
Obolella asiatica Walcott Ptychoparia impar Walcott 
Ptychoparia aclis Walcott Ptychoparia impar (var.) Walcott 
Ptychoparta granulosa Walcott 
The upper shales appear to be almost barren, but fossils may be 
expected in any of the thin limestone strata which occur at various hori- 
zons in the upper half of the formation. 
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Fic. 7 (Blackwelder).—Sin-t’ai-hién, Shan-tung. Section of Cambrian strata in the mountain northeast 
of the city. 1 = earthy limestone resting on gneiss; 2= slabby gray limestone; 3 = porphyry sheet; 
4= dark hard limestone; 5= gray calcareous shale; 6= maroon shale; 7= gray and buff earthy 
limestone and shale; 8=gray shale; 9= brown shale; 10=greenish conglomeratic limestone; 11 = 
gray slabby limestone; 12= brown shale; 13= gray limestone; 14= chocolate brown shale; 15= 
shaly red sandstone; 16 = chocolate shale; 17 = gray conglomeratic limestone; 18 = brown micaceous 
shale; 19 =olive gray limestone and shale; 20= brown shale; 21 = sandy brown and gray limestone; 
22 = thin-bedded crystalline oolitic limestone; 23and 24 = dense gray limestone. The scale of thick- 
ness is indicated in feet. 
IN THE SIN-T’AI DistrRIcr. 
Stratigraphy.—The Man-t’o formation in this area is like that just 
described, so far as its general composition is concerned, but is somewhat 
thicker and more variable in its details (Fig. 7). The basal member is 
commonly an earthy buff limestone about 30 meters thick, whichis separated 
from the granite below, in one instance, by a few inches of emerald green 
clay. In at least half of the sections the limestone contains intrusive 
sheets of greenish hornblende-syenite-porphyry. Above this basal lime- 
stone pale calcareous shales and argillaceous limestones range through a 
thickness of about 45 meters. Certain layers of the shales are brown or even 
reddish, and local strata in the limestones are dense gray or black rocks 
of superior hardness. On the surfaces of these slaty black limestones 
fragments of Redlichia again appear. 
The upper portion of the Man-t’o comprises a rapid alternation of 
dark red and brown shales with thin gray limestones and occasionally a 
