( 97 ) 
properly to a sheet of the boulder, about 4 c.M. thick, extorted accor- 
ding to a lamination plane parallel with that sloping basis, and the 
large upper piece has been pushed on, sliding upward 1'/, ¢.M. in the 
direction from north-west to south-east. The boulder with its extorted 
sheet are immovably fastened in the upper boulder-sand bed, which 
here contains rather much clay and is tolerably hard. In the opposite 
side there is a somewhat larger boulder of granite, polished and 
scratched. The contortions in the white sand of the underground are 
particularly fine in this pit. Apparently no boulders were extracted 
here, as is shown also by the appearance of the surface. 
Pit XVII, which (with XLVID) is nearest to the eastern border of 
the Hondsrug, at a distance of about 150 M. from the first house 
along the Beekslanden, shows, as already has been said, a section 
different from those in the other pits. Above, again the common 
yellowish grey boulder-sand, 0.8 M. thick, in its lower half without 
boulders, under this, however, + 1 M. of reddish brown, hard 
boulder-clay, containing much sinall stone fragments and some boulders. 
This hard, red boulder-clay is well known in the underground of 
some of the Velds of Eksloo, where, locally, it occurs, at small 
distances from the eastern border of the Hondsrug, as far at least 
as Weerdinghe. . 
Quite identical reddish brown boulder-clay, under 0.7 to 0.9 M. 
of block-sand, is visible in a clay digging at the west of the Honds- 
rug, along the Langhiets Kamp near Odoorn. Going from there in 
the direction of Valthe it soon disappears from the underground, 
so that the boulder-sand bed is resting immediately upon the loose 
Rhine-sand. In a sand digging 2'/, M. deep, at a distance of about 
1 K.M. N.N.E. from Valthe, the boulder-sand is 0.4 M thick. 
The white sand below it contains well rounded pebbles of white 
quartz and also of lydite. Halfway Odoorn and the side-branch of 
the Oranje Kanaal the boulder clay begins at a hunderd Meter west- 
ward from the road to Emmen. There, as well as nearer to the 
road, where the boulder-sand rests immediately on Rhine-sand, this 
boulder-sand is 0.7 M. thick; but already before the side-canal the 
boulder-clay reaches the road which remains on it as far as Emmen. 
Following the high road from Odoorn in north-western direction to 
Ees we find the boulder-clay in a clay digging, a little farther than 
the churchyard, under 1 M. boulder-sand. In a well sunk still somewhat 
farther off, in a meadow to the right of the road, about 3 M. of this 
boulder-clay was met with, which contained, next to other rock species, 
especially flint nodules; under the clay again coarse white loose 
sand with small well rounded pebbles of white quartz. Ata distance 
