I(j6 LA fJDCHE : GEOLOGY OY NORTHERN ,SHA.\ STATES. 



represented in the grey limestones, for I have found sections of 

 forms showing septa resembling those of Ascoceras on the surface 

 of the rock, but it is impossible to extract the entire fossil. 



A very fine specimen of a large ttilobite, Pkacops (Dalmanites) 

 a . j Swinhoei Reed, was found by me in a loose 



block weathered out from a bed of dark 

 grey limestone just below the graptolite horizon. This has been 

 figured by Mr. Cowper Reed in his Memoir (Op. ext., fig. 3, p. 140), 

 the figure showing the pygidium, which is almost perfect, and a 

 part of the head shield. It is very closely allied to Ph. (Dalman- 

 ites) Hausmanni Brongn., which occurs in Et. G (lower Devonian) 

 in Bohemia, and belongs to a group of species chatacteristic of 

 this horizon in southern Europe. Mr. Cowper Reed remarks — 



" It is represented in the ' Hercynkalke ' oi the Harz by Ph. (Dalmanites) 

 fuberculalus Rom. The occurrence of *his type in the Burmese Silurian is 

 thus an important indication of the affinities of the Zebingyi beds." 



Since this specimen was found, I have, searched the locality 

 caiefully for more specimens, in company with my friend 

 Mr. Swinhoe, of Mandalay, who was with me when I found the 

 example figured, and has more than once visited the spot on his 

 own account, but neither of us has succeeded in finding more 

 than mere fragments of other individuals. I have, however, 

 obtained a few specimens, though poorly preserved, of another and 

 smaller species of Dalmanites. The locality is easily accessible, it 

 being possible to get to it by train from either Mandalay or May- 

 myo in the morning and return the same evening, and as the wea- 

 thering of the rock proceeds veiy rapidly in the moist climate of 

 these hills, the extraction of the fossils will doubtless become more 

 easy as time goes on. 



The black limestones are succeeded by a series of flaggy, white, 



Passage into Plateau thin bedded "^stones, with the same gentle 

 Nimcstdiic but irregular north-easterly dip, which pass 



upward into the ordinary crushed type of 

 the Plateau Limestone, the passage being apparently quite conform- 

 able. In these flaggy limestones no fossils whatever have been 

 found, and higher up, in the crushed limestone, the only traces of 

 organisms are small joints of crinoid stems, while even these are 

 rare. 



