74 DONALD C. BARTON 
On the east-northeast side of the basin, there is the Bohemian 
crystalline massif composed of granite, gneiss, and schist. From Re- 
gensburg to Hofkirchen the Tertiary beds are in fault contact with the 
crystalline rocks. But farther south, in the Passau district, the Ter- 
tiary beds are at least partly transgressive over the crystalline rocks 
and over a few small remnants of Jurassic; and there certainly is no 
fault contact between the Tertiary beds and the crystallines com- 
parable with that between Regensburg and Hofkirchen. The Danube 
flows on the contact between the Tertiary beds and the crystallines 
from Regensburg to Hofkirchen; and across the crystallines from 
Hofkirchen to Passau. 
On the south, the Tertiary basin is overthrust by the Alps, whose 
northward driven overthrusts have overridden the southern part of 
the basin; how far, is a question; and the Tertiary beds of its southern 
edge, and underlying Cretaceous beds, have been turned up on end. 
Gumbel’s Vindelician ridge, or divide of dry land, is supposed to 
have come into existence at the beginning of the Triassic, and, accord- 
ing to Beyschlag, to have continued in existence throughout the 
Mesozoic and into the beginning of the Tertiary. It is presumed to 
have extended from the Bohemian massif through the Swiss-Upper 
Bavarian upland area to the Plateau Centrale of France. 
The thickness of the Tertiary sediments in the Munich basin is 
unknown from geologic data. The granite was reached at a depth of 
1,060 meters in a test well at Wels in Austria. The deepest (Eisenhub) 
well, in Austria, south of Braunau and not far from the Bavarian 
border, went to a depth of 1,250 meters and stopped in the Oligocene. 
The Ochsenhausen well in Wuerttemberg, not far from the Bavarian 
border, went to a depth of 738 meters and stopped in the Upper Oligo- 
cene. The deepest wells in the Bavarian part of the basin are the Juhl- 
bach wells west of Braunau, the deepest of which went to a depth of 
877 meters. The next deepest wells (other than the other Juhlbach 
wells) had depths only of 430, 400, 353 meters. 
MAGNETIC AND GRAVITY QUANTITIES REPORTED 
The magnetic and gravity quantities which are reported in this 
paper are what may be called the “‘structural’’ variation of the ver- 
tical component Z of the terrestrial magnetic field and the “struc- 
tural” variation of gravity. 
The results of observations of such quantities as the intensity of 
Z or of gravity can be reported in various ways. In geodetic surveys 
the value of gravity commonly is given (1) as the observed value at 
the station, (2) corrected for topography and reduced to sea-level 
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