96 : DR. F. PÁVAI VAJNA 
The saliferous Sehlier (Lower Mediterranean) which is the mother- 
rock for the Hydrocarbons in Middle-Europe occurs everywhere regio- 
nally in the homogeneous Hungaro-Crca-ian Tertiary Basin, which is 
of identical geological structure and which comprises the territories. 
between the Croato-Slavonian and the Transdanubian Island-Moun- 
tains as well as the Hungarian Small Plain and Big Plain. Younger 
good reservoir- and cover-rocks occur also on these territories. All of 
them are folded regionally. 
Conseguently the possibility of forming Hydrocarbons as well as 
of storing them on the territories of the Hungaro-Croatian Basin is 
proved. 3 Ax 
This proof issgiven by the Old Tertiary deposits being known 
on the borders of the Basin, to wit: the Bükk Mountains, the Buda 
Mountains, the Mountains of Velence and the Mountains lying N. of 
the Balaton, on the borders of the Eastern foot-hills of the Alps, 
of the Croato-Slavonian Island-Mountains as well, as of the Moun- 
tains S. of the Száva, which Lower Tertiary deposits are known 
partly in natural exposures, party in bores. This means that the 
Hungaro-Croatián Basin was covered to a great extent by the sea in 
the Paleogene, and that the actual Island-Mountains as well the Hungaro- 
Croatian Island-Mountains as those which have been covered since 
this time have formed islands in it. 
The Mediterranean Schlier as motherrock of Hydrocarbons is 
known also on many places of the slopes of the above enumerated 
Mountains looking toward the basin. They are known even on the 
NE. and E. border of the Hungarian Big Plain (in the Counties of 
Máramaros, Szilágy etc). I have also establishéd their occurrence on 
hand of a rich, characteristic fauna on the N. side of the Pécs 
Mountains in 1920. This of course is a further evidence for the fact, 
that an identical sea has covered the Hungaro-Croatian Basin at the 
time of the Schlier-sea (with exception however of the Island Moun- 
tains) and that this sea has deposited its salty deposits in the same 
way as in Roumania, in Transylvania, or in the Galician, Viennese, 
or Austro-Bavarian Tertiary Basins, where Hydrocarbons have been 
known since a long time. 
We are entitled to draw conclusions to the occurrence of the 
Schlier as óf the mother-rock for Hydrocarbons in the depth; there, 
where it is covered by younger and often strongly transgressing 
sediments, we are justified in this conclusion just by the presence 
of Hydrocarbons themselves: since we can draw the conclusion Írom 
the ocecurrence ofthe Schlier, that Hydrocarbons may be formed near 
to it, so it must also hold good, that there, where Hydrocarbons occur 
