oungoo to Karen nee has for its protection the two garrisons of Thayetmyo th ^ a military post at Thamboola, and several police stations. Besides
the event of war with Burma, moveable columns would operate from th frontier stations to both flanks. What is chiefly wanted to insure the Clent protection of the frontier is a good road, and this is a want still felt. The principal routes across this frontier are the Irrawaddy and routes * and 43.
, All the eastern frontier is rough and difficult, and the question of its etence would be influenced to a great extent by the nature of our relations Wlththe Court of Siam.
The general parellelism of all the streams and hill ranges give an appear-Geology * ance s^mP^cit}r to the physical geology of the
country ; but, owing to the prevalence of forest, it keen found extremely difficult to determine the stratigraphy, and very ie can be said to be actually known about the formations occurring. ^ The formations along the course of the Irrawaddy north of the British jjAntier to beyond Ava have been cursorily examined, as also a tract of the ^PPer Sal ween, but little is knowrn of them, and the upper part of Pegu is unknown.
I he following are the groups in which the rocks found in Burma have been arranged, with their approximate geological position :a
1aNewer alluvium 11 -Older alluvium... ^a-aFossil wood group
^egu group ...
v- Nummulitic ...
Negrais rocks ... Vl1- Mai-i group
Axial group ...
Blown sand, littoral concrete, regur, and
recent alluvial deposits Sands and gravels of the older river,
alluvium, laterite, and c. Sands, gravels, and c., with silicified wood
and bones of mammalia Shales and sandstones, occasionally calcareous ; fossils numerous Shales and sandstones with some limestone bands containing nummulites ... Similar, but much hardened, and sub-
metamorphic in places Limestone, sandstone, calcareous shales,
and c., with ammonites in flatus Shales, sandstones, and c., more or less
altered, and occasionally schistose Limestone, reddish sandstone, and shales Slaty and schistose beds, grits, and c. Gneiss, mica, slate, and c., with granite veins
Supposed geological age.
Recent. Post-tertiary. Pliocene. Miocene. Eocene.
Eocene or cretaceous.
Triassic. | Carboniferous. Azoic.
Ijj^ ^ these groups, the three uppermost form the greater portion of the aild th ^ va^e7- The Pegu Yoma consists entirely of the miocene Pegu group, ^ e ^rakan Yoma and the spurs to the eastward and the westward of main ^bo ^pre chie% composed of nummulitic, cretaceous, and triassic beds. The are ^rfr.A?s limestone and its associated beds, together with the Mergui group, extenri- ^tish Burma nearly confined to the Tenasserim province, the former IkA x northward into Martaban ; whilst the main area of metamorphic rock east of all the other formations. The Burmese gneiss series consists
* Medlicott and Blaoford.* Medlicott and Blaoford.