269 LA TOUCHE : GEOLOGY OF NORTHERN SHAN STATES. 



be in situ or are brought up by a fault. The whole section is 

 on the line of a considerable fault which traverses the older rocks to 

 the west, and the contortion seen in the red beds is no doubt due 

 to movement along the fault-plane. Beyond this the whole of the 

 rocks are concealed, for a distance of several hundred yards, by a 

 calcareous dam extending across the river and a deep pool, above 

 which the fossiliferous rocks appear. 



These consist of dark grey or black limestones, dipping steadily 

 to the south at about 25°, in thin bedded 



Productus an.! Fas- , q{ ^ } ^ made 



nana limestones. J _ r 



almost entirely of Fusulina dongata (Plate 14, 

 Fig. 1), while other layers contain large numbers of brachiopods. 

 These rocks continue, all dipping in the same direction, for about 

 another quarter of a mile, when they abut against massive beds of the 

 ordinary Plateau Limestone, dipping in the opposite direction, that 

 is to say to the north, at a high angle. The last beds of the Anthra- 



colithb series seen are massive and hard blue 



Faulted boundaries. . . , . - . . , -. 



limestones dipping directly towards the older 

 rocks. Down stream, beyond the red sandstones exposed at 

 and below the bridge, the Plateau Limestone also appears in 

 the bed of the river, and it therefore seems probable that the 

 Fusulina beds and overlying strata have been let down between two 

 parallel faults, becoming much folded and crushed in the process. 

 A few scattered masses of hard blue limestone, similar to the 



uppermost beds seen in the river section, were 



noticed in the valley of a small side stream 

 falling into the Xam-Hen below the bridge. These exhibit nu- 

 merous examples of brachiopoda, bryozoa, and corals on the weathered 

 surface and in section (Plate 14, Fig. 2), but it was found almost 

 impossible to break them off without damage. 



The collection of Namun was made from a small outcrop of 



dark grey limestone, weathering to a rusty 

 Outcrop at ^ amun. y e ll 0 w, exposed on the path running along the 

 northern flank of Loi Pan from Monghko to Manpan, near the 

 crest of a low rise half a mile to the north-east of the village of 

 Namun. The rock in situ is crowded with fossils, mainly bryozoa, 

 but thev are only to be obtained on the surface of weathered fragments 

 or by washing the clay derived from the outcrop, as at Padauk- 

 pin. The whole exposure does not cover a space of more 

 than 3 or 4 square yards, and the bedding is very indistinct, 



