TERTIARY. 



315 



Fossils — Lashio coal 

 field. 



From a sketch hy the author. 

 Fig. 9. 'Dyke' of white Tertiary clay in Plateau Limestone, near Man-kiin. 



for it now resembles a dyke with vertical walls on either 

 side, projecting from the hill slope, the limestone which 

 originally enclosed it having disappeared by solution 

 (Fig. 9). 



The palseontological evidence available for determining the 

 period to which these beds belong is some - 

 what meagre and unsatisfactory, but such 

 as it is, it indicates an extremely late Tertiary, 

 or perhaps even Pleistocene age. The fossils that do occur are all 

 shells of gastropods of fresh-water types, and the leaves of plants. 

 In the Lashio basin they have as yet been found only at one spot, 

 in a seam of coal and the clays associated with it, exposed on the 

 right bank of the Namyau immediately above a sharp bend in the 

 river opposite the village of Hko-hkam (Loc. 1, H 1). This loca- 

 lity is mentioned by Dr. Noetling {R'ords, G. < s '. /., Vol. XXIV, 

 Pt. 2, pp. 106, 114), who says : — 



" The only species I could distinguish belonged apparently to tin- genus 

 Planorbis. There were also fragment of another big gjwtropod, which could 

 not be determined." 



