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LA LOUCHE : GEOLOGY OF NORTHERN SHAN .STATES. 



Ani Sakan stations. It is especially well seen close to Twinnge (Loc. 

 41, B 5), where specimens of Monograptus dubius were collected, 

 and again about half a mile north of Ani Sakan, near the deserted 

 village of Myenigon (Loc. 40, B 5), where, in addition to Tent, 

 elegans, a few specimens of a small Lingula were found. For 

 some distance beyond this point no outcrop of the Zebingyi beds 

 has been seen, but fragments derived from them, containing Tent, 

 elegans, were picked up on the hill slopes between Letkaung and 

 Lebyaungbyan, further to the north-east, and in a small landslip 

 close to Naungkangyi village, near Maymyo ; showing that the 

 band continues along the edge of the Plateau Limestone in 

 this direction, though its actual outcrop is concealed by rain wash. 

 The Zebingyi beds are concealed, either by faulting or by an 

 overlap of the overlying Plateau Limestone. 

 Final appearance , th southern edge of the hills north of 



north ot Maymyo. & ° 



Maymyo, but they are found again at the very 

 edge of these hills on their eastern side, in a small stream about 

 a mile north of Taimgmio (Loc. 45, C 4). Here Tentaculites elegans 

 occurs in as great profusion as at Kyinganaing, and in a similar 

 clayey rock, but the graptolites can hardly be detected. 



This is the final appearance of these beds, at least so far as 

 they can be identified by the presence of Tentaculites and Grap- 

 tolites. Beds of black limestone shales occur to the north and 

 east in a similar position, at the base of the Plateau Limestone, 

 but careful search has failed to discover either of these fossils 

 beyond this point. 



On the northern edge of the plateau extending eastwards from 

 the hills just mentioned some black limestones 

 angyu e s. which must be close to, if not quite at the 



base of the Plateau Limestone, and therefore on or about the 

 horizon of the Zebingyi beds, occur in a depression, a little west 

 of the village of Pangyu (Loc. 46, C 3), on the path to 

 Namhsu-hka. The fossils collected here were -.—Atrypa marginalis 

 Dalman, a species having a very wide distri- 

 FobMls. bution, occurring in the upper Ordovician 



of Britain and Scandinavia, and the Silurian of Central Europe 

 and North America. The Pangyu specimen is well preserved, 

 and only differs from the usual form in possessing fewer 

 lateral ribs; A. (Atrypina) subglobvlaris Reed, a new species 

 resembling A. semiorbis Barr. from Et. F -' (upper Ludlow), and 



