186 KING: KADAPAH AND KARNUL FORMATIONS. [PART II1. 
somewhat rounded in form, though they are at times angular. Gene- 
rally, they are rounded, and sometimes as it were segregated in irregular 
spindly and nodular forms. As a rule, the matrix and the granules are 
of a dull clayey appearance, but freshly broken and internal surfaces 
are sub-crystalline. When crystalloid, the rock is then seen to contain 
apparently worn* erystals of chlorite, felspar, and carbonate of lime. 
The crystals are, however, more generally sharp in their outline. It 
occasionally happens, when the shales are well weathered, that some 
of them do show that their spotted appearance is due to the presence of 
minute angular and roughly rounded fragments of chlorite and other 
minerals different from the matrix of the rock. 
An average specimen of the more typically granulated shale gives 
the following composition} :— 
Loss by ignition .., E to 3:5 
Silica ity Ae 28575 /5 Sil 
i Oxides of iron and alumina ... 25201911525 
Lime aN ME xu 1 70:741 
Magnesia ue y 2.3 025 
Potash d TM .. 0:08 
Soda PET s .. 6:04 
99:67 
The partieular variety here analysed is a thin-layered flaky (flaky 
when worn, much more compact in the specimen now preserved) coarsely 
granulated rock of a general dark brown purple color. When examined 
with a magnifier, it is seen to be made up of irregular rudely ellipsoidal 
granules of nearly black or dark green color, in a matrix of pale purple 
clayey material. The granules are, however, so close together that the 
* So much alteration was superinduced on these rocks, not only at the time of their 
deposition when they were overflowed and intruded on by greenstone, but subsequently 
when the general metamorphism of both KADAPAHS and KARNULS took place, that it is 
hardly possible that these crystals could show any worn appearance. Even their present 
Shape and constitution may all have resulted from influences long subsequent to the period 
of volcanic action now indicated in the series. 
T Lam indebted to my colleague, Mr. A. Tween, for this analysis. 
Ca) 
