STRATIGRAPHY OF CHI-LI AND SHAN-SI. 143 
South of Wu-t’ai-hién.—On the west side of the Sing-ho, below the 
city of Wu-t’ai-hién, lower Sinian rocks are exposed in a narrow gorge. 
They lie in a syncline, cut off on the south by Algonkian rocks which 
have been overthrust upon them (Fig. 38). The section reveals the upper 
part of the Man-t’o formation and a small thickness of Middle Cambrian 
limestone. The Man-t’o includes red-brown shales with thin green bands 
and seams of greenish quartzite. ‘The limestones are gray with a greenish 
tinge, and are locally oolitic. 








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Fic. 37 (Blackwelder. Atlas sheet CI, section DD).—Section in the canyon of the Shi-t’ou-ho, east 
of Téu-ts’un, Shan-si, showing Hu-t’o (Algonkian) overthrust on Man-t’o (Cambrian) shale, and Man- 
t’o overthrust on higher Ki-chéu (Cambro-Ordovician) limestone, from the north; also characteristic 
carinate folds in the Ki-chdéu limestone and an overthrust within that formation from the south. 





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Fic. 38 (Blackwelder. Atlas sheet C I, section GG).—Wu-t’ai-hién, Shan-si. Hu-t’o (Algonkian) 
limestones and quartzite overthrust upon syncline of Man-t’o (Cambrian) shales. 
About to feet, 3 meters, above the base of the limestone a few Middle 
Cambrian fossils were collected. Among the fragmentary remains the 
following species have been identified: 
Coscinocyathus elvira Walcott Agraulos(?) mele Walcott 
Obolus obscurus Walcott Agraulos nitida Walcott 
(Orthis) Plectorthis kichouensis Walcott Agraulos uta Walcott 
Agraulos armatus Walcott Ptychoparia lila Walcott 
Of these only one species was found also in Shan-tung, viz: Obolus 
obscurus, which occurs near the base of the Ch’ang-hia limestone. 
In the rugged canyons of the T’ién-hua and Yau-t’6u coal district 
south of Wu-t’ai-hién, the Ki-chéu limestone is the prevailing formation, 
