75 



It is, indeed, striking that v. Richthofen found a coral limestone just 

 beneath the Sin-tan shale at Sin-tan, with a coral fauna which according- to 

 Frech is decidedly of Lower Carboniferous age.-'' The stratigraphical rela- 

 tion of this limestone to the other rocks was given by v. Richthofen in details 

 as follows ; namely going up-stream from San-to-ping-^ along the Yang-tse- 

 kiang he found^' : 



1. Granite of San-to-ping. 



2. Dark granitic rock. 



3. Crystalline schists. 



4. Thick bedded dark sandstone. 



5. Platy limestone 1 300 ft. 



6. Thick bedded limestone of gra}', yellow 

 and black colour 1 100 ft. 



7. Greenish sandstone 30 ft. 



8. Platy limestone, yellowish and greynish 

 in colour. Coral limestone. 4^0 ft. 



9. Lustrous green slate, interbedded with 

 dark reddish brown siliceous and cal- 

 careous slate 800 ft. 



10. Thick bedded limestone 150 ft. 



11. Platy nodulous limestone 1500 ft. 



12. Bluish white, thin bedded limestone) 



> 1 500 ft. 



13. Thick bedded limestone J 

 Frech*' described from a limestones (with chert), near Sin-tan, 

 Prodjictiis Lincalns W.aag. 



spijiiilo-costatHS Abich. 

 intcnncdius Abich var. sinensis Frech. 

 The limestone, according to P'rech, has the following stratigraphical rela- 

 tion with the other rocks : 



1) Frfxh: in Richthofen'.> China, vol. V., p. 61. 



2) San-to-ping ==4*^ 



3) Richthofen: Ciiina, vol. III., pp. 106-7. 



4) Frech: in Richthofen's China, vol. V., pp. 175-177. 



(= Nan-tou sand- 

 stone series of 



NODA.) 



( = Niu-kan lime- 

 stone of Noda). 



(? = Lower Clayslate 

 series of NoD.A.). 



(= Ping-shan lime- 

 stone series of 



NOD.A.). 



(= Upper Cla.\'slate 

 series of NoD.A.). 



,(= Mi-tsang lime- 

 stone of Noda). 



