603 



man J fresh plagioclase-splinters and magnificent idiomorpliic biotite 

 laminae. 



Where the valley of the Tji Keas breaks Southward into the 

 uplands about 1^ km. to the south of the embouchure of the Tji 

 Djajanti, the disclosures reappear; they are the familiar, somewhat 

 marly hard clays, which, however, here include bands of marl, 

 sandstone, and conglomerates, which incline 30° — 45° towards the 

 South. The strike is N 65° W. On this level, then, which lies 

 stratigraphically at least 1700 m. above the core layers of the Pr. 

 Maoeng anticline, we find for the first time numerous coarse 

 clastic bands intercalated into the tertiary formation. The marl is 

 not fossiliferous, the sandstone and the conglomerates are calcareous, 

 and all stones are very rich in andesitic constituents. In a small 

 affluent of the Tji Keas, ranning Southward, it is admirably revealed 

 that in still more elevated levels, true andesitic tuff-breccia succeed, 

 which, in their turn, alternate with sandstones and clays. In the 

 most Southern affluent of the Tji Keas, the Tji Bedoeg, we again 

 encounter hard shales, including besides bands of andesitic sandstones, 

 conglomerates and breccia, also a layer of Globigerina marl and 

 a thin bank of coralligenic limestone. In the latter Lithothamnia 

 and Amphistegina occur. The direction is N. 55° W., the slope 

 30 — 31° S. The southmost disclosure of the Tertiary I found in a 

 rivulet north of Gadok, where the andesitic sands and tuffs dip 

 20° Southward. 



In the profile described above we have encountered a tertiary 



Profile I. 



EED Andesite and allied rocks. 

 ^g Coarse clastic rocks with 



andesitic material. 



Limestone. 

 Shale and marl. 



formation whose lowermost portion consists of homoplastic clays 

 that bear no or hardly any volcanic matter. Their marine origin 



