A REPORT ON UPPER PALEOZOIC FOSSILS COLLECTED IN 



CHINA IN 1903-04. 



GENERAL REMARKS AND CONCLUSIONS. 



The upper Paleozoic collections from China, collected by the Carnegie 

 Institution of Washington Expedition, which I have had the honor of 

 examining comprise fourteen lots, of which the geographic distribution is 

 as follows : From the province of Shan-tung two lots (59 and 69) ; from the 

 province of Shan-si one lot (20) ; and from East Ssi-ch'uan eleven lots (i, 2, 

 3. 4. 5. 6, 7, 8, 9, 16, and 17). 



The material from East Ssi'-ch'uan, which thus comprises practically 

 all the collections, may again be subdivided according to stratigraphic occur- 

 rence along lines which are so coincident with faunal peculiarities that a 

 number of smaller groups are formed, each of which is entirely distinct from 

 the others and from the equally disconnected collections from the other 

 provinces. 



The lowest horizon in the Ssi-ch'uan section is represented by lots 6, 8, 

 and 9, obtained near Ta-miau-ssi. The next horizon above is found in lots 

 i, 2, 3, and 4, collected near Ta-ning-hien, and by lot 7, collected near 

 Liang-ho-k'6u. Lot 7 contains only one species in common with lots 1,2,3, 

 and 4, but this is not surprising, in view of the fact that the whole number 

 obtained is small. By reference to the table on page 304 it will be seen that 

 the fauna of lots i, 2, 3, 4, and 7 contains nothing in common with those of 

 the first group, except the presence of crinoidal fragments. 



The next horizon is represented by one collection (17) of three species, 

 none of which occurs in the beds below. The succeeding horizon also is 

 represented by one collection (16), with two citations, neither of which was 

 obtained elsewhere. The topmost formation, the K'ui-chou series, is like- 

 wise represented by one collection (lot 5), containing three citations, and is 

 unconnected with the faunas below, the only resemblance indicated by the 

 table being some indeterminable pelecypod fragments. 



From the province of Shan-si we have one collection (lot 20) of three 

 species, one of which appears to be the same as a form obtained in East Ssi- 

 ch'uan (Hemiptychina ? aff. H. orientalis, from station 7). The specific 

 characters in one case, however, have been destroyed, and the union of the 

 two occurrences is rather an expression of the fact that there is no ground 

 for separating them than that the evidence assigns them to the same species. 



From Shan-tung our collections contain two lots (59 and 69), which 

 have no determinable species in common. Although they contain two cita- 

 tions which occur in the other lists, the material is poorly preserved, and 

 the community of reference in this case, as in the other, is an expression of 

 the absence of negative rather than the presence of positive evidence. 



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