Hubbard — Antimony Mines of Shin Chow. ±00 



that they occur near here. (Exact location and horizons 

 unknown.) This big limestone makes a rather rugged 

 ridge of very uneven height, yet continuous southward to 

 the west branch of the river and several miles beyond. 



A shale bed. probably as thick as the limestone, follows 

 the latter and. is succeeded by a qnartzitic limestone. The 

 shales give low. open country, but the quartzite makes 

 a small ridge. Xext comes a thick series of shales of 

 many colors. — blues, greens, reds, and browns. Some 

 beds of this series are a little more resistant than others, 

 but none of them are strong enough to hold up ridges. 



Farther east than the shales and about a mile from the 

 blue limestone is another ridge-maker, parallel with the 

 first. Its beds are thinner and mostly gray, not blue, 

 and not as dark as the former, but violently contorted 

 and plicated. It has a few veins of calcite, but no such 

 development as the other limestone has. Xo fossils 

 were seen in any of these series except in the western 

 limestone, but no search could be made because of lack of 

 time. 



Structure. — Coal is reported a short distance east of 

 this second limestone and is mined 6 or 7 miles down- 

 stream, which would probably be not more than 5000 

 feet east, stratigraphically, of the contorted limestone. 

 In the vicinity of the coal, the dips in shales and sand- 

 stones are S. E. by E. and not strong, while in the lime- 

 stones and quartzites above Shiu Chow, nearly everything 

 is about on end. Time did not permit scouting to the 

 west to ascertain certainly, but the structure has the 

 appearance of a great anticline, the east half of which is 

 two miles or more across. The rocks in the west part 

 of the sections would then be the oldest seen, and the coal 

 and associated rocks the youngest. The most probable 

 interpretation for the ages of the rocks, then, is that the 

 western or dark blue is, as suggested, Ordovician; the 

 lower shales may be Silurian; the quartzites and upper 

 shales then would follow as Devonian; and the contorted 

 limestone may be Mississippian, with Coal Measures 

 above or on eastward. 



Ores. — For several years, in the stream beds leading 

 down eastward from the older limestones, the peasants 

 have been picking up pieces of stibnite and more or less 

 oxidized mas>es of antimonv ore. In the summer of 1920, 



