36 RESEARCH IN CHINA. 
lots collected from approximately the same horizon, within a radius of 
not more than 2 miles, only three species occur in two of the lots and 
only one in three of them. ‘This last is IJlenurus canens, an abundant 
trilobite, which is present in most assemblages of fossils from the lower 
part of this limestone. ‘The entire list from this horizon includes: 
Agnostus chinensts Dames Ptychaspis ceto Walcott 
Illenurus canens Walcott Ptychaspis cadmus Walcott 
Illenurus ceres Walcott Ptychaspis calchas Walcott 
Pagodia macedo Walcott Ptychaspts sp. undt. 
Pagodia bia Walcott Menocephalus? depressus Walcott 
Pagodia dolon Walcott Dikelocephalus? brizo Walcott 
Anomocarella carme Walcott 
Another small lot, collected 7 to 8 miles, 11 to 13 kilometers, east of 
Ch’au-mi-tién, seems to belong here, although no section was measured at 
that place; it contains: 
Illenurus canens Walcott Ptychaspis campe Walcott 
Ptychaspis calyce Walcott 
Fossils are comparatively rare in the upper portion of the Ch’au-mi- 
tién limestone, but small numbers of them were found within 50 feet, 15 
meters, of the top, in certain light gray layers, and occasionally in the 
dark bluish strata. Several lots from this horizon, all taken in the vicinity 
of Ch’au-mi-tién, furnished a combined list of the following species: 
Billingsella pumpellyi Walcott Ptychaspis acamus Walcott 
Orthis (Plectorthts) pagoda Walcott Ptychasptis ceto Walcott 
Orthis (Plectorthis) kaysert Walcott Ptychas pis sp. undt. 
Platyceras clytia Walcott Anomocarella baucis Walcott 
Orthotheca cyrene Walcott Bathyurus? 
From the stream gravels used in making the railroad grade at Tsi- 
nan-fu, we obtained Plectorthis linnarssont Kayser and Obolus sp., which 
indicate that these erratics were derived from approximately the same 
horizon as the list just enumerated. 
IN THE SIN-T’AI DISTRICT. 
Stratigraphy.—The classification of the Kiu-lung group into three 
separate divisions is not appropriate for this district, in spite of the fact 
that the general paleontologic horizons of the Ch’ang-hia area are recog- 
nized here with ease. The black oolite is much reduced in thickness, and 
is largely replaced by shales. The Ku-shan shale is thicker and carries 
fossils which belong to the Ch’ang-hia and Ch’au-mi-tién formations, 
respectively, in its upper and lower portions. The Ch’au-mi-tién limestone 
alone retains the general character noted in the first area studied, but 
