70 



that the Sin-tan formation, 540 m. thick, represents Silurian and Devonian 

 time in this region.^' " 



The generalized section of formations in eastern Sze-chuan and middle 

 Yang-tse gorges given by Willis and Blackwelder is as follows^' : — 



Permo-mesozoic 



Kui-cho'^) series 

 ty — inferred) 



300 + m. 



Sandstone, shales and sandy shales, 

 with thin limestones and coal seams. 



45 



Gray fossiliferous limestone. 



120 m. 



Massive red shale. 



Upper Carboniferous 

 '^Local uncc 



Wu-shan limestone 



goo m. 



Massive, thick bedded limestone of 

 gray, brown, or black colour, locally 

 flinty. 



60 m. 



Local green shale and thin limestone. 



165 ± m. 



Dark bituminous limestone locally 

 rich in flint nodules. 



15 ± m. 



Local quartzitic sandstone. 



60 ± m. 



Dark limestone. 



Middle Palaeozoic 



Sin-tan shale 



350 m. 



Massive green shale with thin local 

 quartzite and crystalline limestone; 

 shales often brown or black in upper 

 horizones. 



Sinian 

 (Cambro- 

 Ordovician.) 



Transition 





Sii-kia-pa transition member; green 

 shale and thin limestone. 



Ki-sin-ling 

 limestone 



1200 ? m. 



Dense gray limestone without flmt 

 nodules; massive, thick bedded. Basal 

 layers locally cherty. 



75 m- 



Dense slaty limestone and shale and 

 thin basal conglomerate. 



1) Research in China, vol. I, i, p. 273. 



2) Research in China, vol. L, i, p. 264. 



3) Kui-cho=^^^^ 



