734 
miopliocene that we saw already so remarkably facially modified in 
the Sekerat Muntains. Perhaps it embraces also still the youngest 
parts of Old-miocene. 
The study of the Maluwi anticlinal gives us still more information 
in this direction. We saw above, that the vertical distance from the 
deepest Globigerinaemarls in the Northern part of the Sembulu 
anticlinal to the youngest Sampajan marls in the synelinal lying 
eastward, amounts to about 1200 m. From the synelinal to the cul- 
mination point of the Maluwi anticlinal there is however over 1700 m. 
Consequently we should expect, to see in the centre of the Maluwi 
anticlinal the shales appear again. This is however not the case: 
the whole of the Maluwi anticlinal is composed of monotonous, grey- 
blue, clayey sometimes glauconitie marls of Globigerinae and of 
blue, plastic clays, containing but few layers of quartz sand, and 
in one spot an extremely thin stratum of glance coal (anthracite). 
An important part of the old-miocene strata, which oceurred on the 
Sembulu anticlinal still almost exclusively in normal facies, has con- 
sequently been developed as Globigerinaemarls in the Maluwi anticlinal 
lying towards the sea. In the synelinal between Sembulu and Maluwi 
anticline we discovered still true Sampajau marls; more E.N.E.- 
ward they are however modified, becanse the Globigerinae come 
much more to the front, and at the same time the other fossils 
recede more baekward. In this way we find in the region of Pala 
Sangkuwang and Godang marly rocks representing as it were a 
penetration of the Sampajan marl-facies and the Globigerinaemarl- 
facies. W. SravB*) bas described a small fauna of most likely plio- 
cene age. The youngest strata of this region are coralligenous lime- 
stones, which come to light at the mouth of the Sungei Tungkap 
and between the lower course of the rivers Kauli and Lindak. 
On the southern limb of the Maluwi anticlinal, lying towards the 
sea, we do not find back anything of the Sampajau marl-facies; as 
far as the central part of the Sungei Mangenai exclusively Globige- 
rinaemarls occur here, which contain towards the top banks of the 
Biotite- bearing tufas described above. The Globigerinaemarls are then 
succeeded at the Sungai Mangenai by coralligenous limestones, which 
in their turn are covered with a series of sands and gravels — the 
youngest part of the tertiary formation or perhaps already of quart- 
ernary age. These limestones suggest, that towards the end of the 
tertiary formation the sea slowly receded, a conclusion, which had 
already been arrived at by W. SravB (l.c) on other grounds. 
y Vierteljahrschrift der Naturf. Gesellschaft in Zürich. 61. 1916, p. 128 et seq. 
(The thickness of the Sadgkulirang marls is indicated here too small.) 
