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about 0,25 M. On the Buiner Veld (XLVIII to LIV) it varies from 
0.2 to 0.8 M., attaining in a single case, locally, 1.5 M. Ata distance 
of 200 M. north-west of XLIII there is on the Noorder Veld, near 
the Tippen, a pit numbered XLVI, with 0.4 M. of boulder-sand, 
and, 100 M. N.N.W. of the latter, another pit, numbered XLVII, 
showing a very irregular thickness of this upper bed, it locally giving 
way in the stratified white Rhine-sand. Moreover the latter contains, 
unto a depth of 2 M., boulders of granite and other rocks of Scan- 
dinavian origin. 
From this table, that refers to an area long 400 M. in the same 
direction as the Hondsrug extends (from north-west to south-east) and 
broad 250 M., at right angle on it, and from the other given data, 
it appears that the thickness of the boulder-sand bed is very slight, 
attaining seldom 1 M., further that it varies greatly at small distances 
(often in the selfsame pit). The fact that the difference in height of 
the position of these pits is much larger than those differences in 
thickness, proves that the upper or boulder-sand bed follows the 
undulations of the preglacial nucleus of the Hondsrug and is rather 
regularly laid down upon it. | 
Some details may still be mentioned. In pit XII the brownish 
boulder-sand, having an average thickness of 0.6 to 0.7 M., penetrates 
wedgelike in the white sand unto 1.25 M. beneath the surface, whilst 
the strata of that underground are rent asunder unto about 2 M. lower 
than this wedge. This brings to the mind straining forces having 
worked laterally to the Hondsrug, such as would have arisen from 
an uplifting of the sand masses now constituting the nucleus of that 
ridge. In pit XXXIV two boulders from 0,2 to 0.3 M. in dimension 
are sunk totally below the general inferior limit of the boulder-sand 
bed in the pit. In pit XXXIX and XLI the sand, of a darker brown 
colour, is partly containing enough clay, that it becomes plastic, and 
also by alluviating it is proven that no small quantity of clay is 
present there. 
But besides such particularities there are to be observed phenomena 
of greater importance. This is the case with N°. XLVII, showing 
fluvio-glacial mixing of the bottom-moraine with the sand of the under- 
ground, and with the two pits N°. XLI and XVII. In pit XLI there 
is in the south-western side a boulder of quartzite, almost square, about 
measuring 0.35 M. in every dimension. It is fixed at the bottom of the boul- 
der-sand bed, having there a thickness of 0.7 M., and depressing, pocket- 
like, the strata, there rather undisturbed, of the white quartz-sand, unto 
0:4 M. below its inferior extremity. Its basis is a plane ascending 
in the direction from north-west to south-east; but this basis belongs 
