04 COGGIN BROWN : MINES & MINERAL RESOURCES OF YUNNAN. 



defect is the large proportion of fines. It is used in distilleries at 

 Mi'iig-tzu. 



In the neighbourhood of Ta-yao-chai, a village some 25 miles 



east-north-east of A-mi chai, two coal seams 



Coal near Ta-yao- found b Dcpra , t .l The first OCClirS half 



way between Yang-tsi-kiou and Ta-chai, 

 dipping to the north-west and forming part of a syncline of Upper 

 Trias rocks. The seam is about a metre thick ; the outcrop coal 

 is weathered and pulverulent, but is probably better in depth. 



The other seam crops out on the road between Ta-yao-chai 

 and Choncr-chai and is associated with coarse sandstones containing 

 plant remains belonging to the Upper Noric. The seam dips 

 north-east and the coal visible at the surface is dull. It may be 

 better deeper down. 



If these deposits eventually prove valuable, it must be remem- 

 bered that they are two stages away from the railway and conse- 

 quently can only be utilised in Yunnan itself owing to the cost of 

 transport. 



Middle Triassic Coal. 



The coals of the middle Trias are of little economic importance. 

 They arc disseminated in sandstones and shales and are generally 

 very admixed with clay and shaly material. 



Lantenois 2 regarded the Tsc-sou seams as Upper Trias or 



Rha3tic, but Deprat 3 has shown that they arc 



Tse-sou coal-seams. . , • , ., j , ^,,4.„;„;„„ 



associated With the sandstone containing 

 Myophoria inceqiricoslata which are correlated with the St. Cassian 

 horizon or the upper portion of the Middle Trias. 



Two seams, each about 1 metre thick, separated by a band of 

 coarse sandstone, are found between Ya-ma-chai and Tse-sou. 

 Both authorities state that the coal is of very mediocre quality. 

 The locality is about 15 miles east- north- east of A-mi chai. 



Near S.'.u-tien, Deprat noticed a coal seam about 1-20 metres 



thick in the coarse sandstones at the base 



Sin-lien .seam. r . . , ,, m . m1 , . £ 



of the middle Trias. The coal is of very poor 

 quality and mixed with much clayey material. Were this not so, 

 its distance of over (JO kilometres from the railway at A-mi chou 

 prohibits its transport. 



1 De., p. 245. 

 '- La., }). 395. 

 3 Dc., p. 243 



