STRATIGRAPHY OF CHI-LI AND SHAN-SI. 145 
The overlying shales contain two seams of fossiliferous limestone; from 
the lower of these (35 feet, 10.5 meters, above the last horizon) we have: 
Agraulos obscura Walcott Ptychoparia vesta Walcott 
Ptychoparia nereis Walcott Dolichometopus hyrie Walcott 
Ptychoparia inflata Walcott 
The shaly horizon is overlain by a massive oolitic limestone nearly 50 
feet, 15 meters, thick, and from this we obtained fossils related to the 
middle of the Ch’ang-hia oolite: 
Orthotheca glabra Walcott Dorypyge richthofeni levis Walcott 
Obolus shansiensis Walcott (?) Anomocare bigsbyi Walcott 
Acrotreta shantungensis Walcott Ptychoparia undata Walcott 
Yorkza ? ortentalis Walcott Ptychoparia comus Walcott 
Plectorthis sp. undt. Solenopleura pauperata Walcott 
Agnostus chinensis Dames Crepicephalus damia Walcott 
Dorypyge richthofent Dames 
Above the oolite a member of the shaly limestone yielded a few addi- 
tional forms: 
Obolus (Lingulepis?) sp. undt. Anomocare flava Walcott 
Platyceras willist Walcott Ptychoparia nerets Walcott 
Orthotheca glabra Walcott Ptychoparia sp. undt. 
Dorypyge richthofeni levis Walcott 
Near the top of the section a massive gray limestone mottled with 
ocher forms cliffs about 100 feet, 30 meters, high. It is very poor in 
fossils. The summits are composed of red, brown, and gray conglomeratic 
limestones, identical with those which characterize the Middle Cambrian 
of Shan-tung. Fossils are not abundant in them and they are represented 
in our collection by only two forms, both of which have close relatives in 
the middle Kiu-lung faunas of Shan-tung: 
Agraulos regularis Walcott Blackwelderia cilix Walcott 
The conglomeratic limestone is overlain down the dip by a dense 
black-gray limestone, which is lithologically similar to the Ch’au-mi-tién 
of Shan-tung, and contains two fossils correlative with the fauna of that 
formation. 
Plectorthis kaysert Walcott Ptychaspis bella Walcott 
From the details of this section, which is better known than any 
other outside of Shan-tung, it is obvious that the Cambrian rocks of 
Shan-si and of Shan-tung are closely similar. All the larger divisions of 
the one are recognizable both lithologically and faunally in the other. 
