84 DONALD C. BARTON 
The crystalline basement, somewhere on the western border of 
Bavaria or in Wuerttemberg, should begin to rise northwestward 
coward the granitic core of the Black Forest and Odenwald. The ray- 
ing of the magnetic isogams in the southwestern part of the basin may 
indicate the beginning of the turn of the crystalline basement. Farther 
north, along the Danube, the corresponding bending of the isogams 
may have been lost in the large anomalies of the Alb and Donau mag- 
netic axes. 
VINDELICIAN RIDGE 
The crest of the much disputed Vindelician ridge would seem 
not to cross the Munich Tertiary basin. The crystalline basement very 
likely would have been arched up to form a crystalline ridge as the 
core to the Vindelician ridge. The results of the magnetic survey of the 
basin indicate the absence of any such subsurface crystalline base- 
ment ridge, and the presence of a generally plane west-southwesterly 
dip of the basement across the basins. The results of the torsion-bal- 
ance survey indicate the absence of any large structural ridge east- 
west across the basin, and indicate the presence of a fairly uniformly 
southerly dip of the basement under the Tertiary beds. The presence 
of a Vindelician ridge across the basin presumably should be suggested 
at least faintly, either by one or the other or by both of the methods 
(torsion balance and magnetometric). The absence of the slightest 
suggestion of the presence of any such ridge across the basin indicates 
that presumably no Vindelician ridge crosses the Munich Tertiary 
basin. 
The position of the crystalline core of the Vindelician ridge south 
of the present Munich Tertiary basin would be consistent with the 
results of the B. M. I. surveys and would be suggested by the pre- 
sumable continuation of the Bohemian crystalline massif southwest- 
ward under the upper Austrian belt of Tertiary formations. 
WEST FLANK OF BOHEMIAN MASSIF 
One of the problems of the B. M. I. geophysical surveys was to 
determine the character and steepness of the dip of the surface of 
the crystallines from the Bohemian massif west-southwestward under 
the Tertiary beds. In the area north of Regensburg, a north-south 
fault of considerable throw marks the contact between crystalline 
rocks of the Bohemian massif on the east and the Mesozoic sediments 
on the west, and west of the fault there is a large north-south syncline 
in which the only Cretaceous beds north of the mountains outcrop, 
overlying the Jurassic beds. From the vicinity of Regensburg south- 
southeastward to Hofkirchen, a fault is postulated also for the south- 
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