298 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



Over the greater part of the Napeng area the beds consist of yellow 



_ . , , . , , argillaceous shales and soft, sandy marls, 



Lithological cnarac- . . ' , * 



ters, Napeng area. sometimes passing into hardened grey cal- 



careous shales, with here and there a band of 

 hard blue limestone. One band of this latter rock is fairly per- 

 sistent, and seems to occur at or quite close to the base of the 

 formation. It is a dense, compact, splintery rock, usually crowded 

 with fragments of shells, which show only on the weathered surface 

 of the rock or in thin sections under the microscope. Sections 

 cut from this limestone near Napeng and Loi-lam contain numerous 

 minute foraminifera, including representatives of the families Lit- 

 uolidce, Miliolidce, and Textularidce, but as they can only be seen 

 in this manner, their specific identity cannot be ascertained (Plate 

 15, fig. 2). 



At Kyaukkyan (Loc. 11, D 3) the fossiliferous beds consist of 

 yellow shales, resting upon a band of dark 

 Kyaukkyan. limestone similar to that described above. 



They are well exposed in the cuttings on the cart-road and on the rail- 

 way, both of which pass through a notch in the great Kyaukkyan scarp 

 at this point. The shales no doubt owe their preservation to the fact 

 that they have been let down against the hard Plateau Limestone 

 by a fault, already mentioned. They are exposed over a very 

 small area, and do not extend for more than a few hundred 

 yards to the north or south of the gap. At 

 Hson-oi (Loc, 13, E 2) also, only a small patch 

 of these beds is exposed, in a low cutting on the railway just 

 before it crosses the cart-road above the railway bridge over the 

 Namhsim river, and immediately beyond the cutting shown in Plate 

 21. Here the beds are harder and more calcareous than at 

 Kyaukkyan, of a light grey colour, and some of the fossils have 

 their shells preserved. Here also they are associated with a band 

 of hard blue limestone, on the weathered surface of which corals, 

 Lophosmilia, Isadrcea, etc., are visible. 



If we compare the lists of fossils given on previous pages of this 

 Memoir with that shown in Table 11, it will 

 Loral character o be no ti C ed that the number of new species 



fauna. r 



which it has been found necessary to establish 

 bears a much higher proportion to the total in the case of the 

 Napeng beds than in that of any of the Palaeozoic formations. The 

 figures are given in Table 12. 



