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province of Drente vaN CaLkeR') mentions Buinen, Steenbergen and 
Zeegse as places where he came across these stones, whereas I 
myself found some at Odoorn. 
2. Grey sandstone with interlaced coloured layers. 
A small piece of quartziferous sandstone, 7 centimetres long, 1s 
almost entirely grey-coloured. Two systems of coloured layers, varying 
from red to violet, interlacing under angles of about 30 degrees, are 
also found. The layers of each system separately run parallel to 
each other. Surfaces of deposit do not occur and the size of the 
grains of sand is everywhere the same, so that it is impossible to 
examine which layer-system runs parallel to them. 
This sandstone was made mention of for the first time by Nar- 
HORST *), who found erratic-blocks consisting of it in Jungfrun in the 
Kalmarsund. With Dames ®) he found the same kind of stone in 
Oeland, a few years after. Later on the latter writer *) could tell 
about this kind of erratic-block occurring in diluvial layers in the 
neighbourhood of Berlin. 
As one of the pieces found there contains Scolithus-tubes, he could 
also draw the conclusion that their age is the same as that of the 
above mentioned Scolithus-sandstone. This conclusion is confirmed 
by means of a piece of Scolithus-sandstone that I found at Warns a 
short time ago. Through the grey piece of sandstone run on one 
side a few violet-coloured layers, which are intersecting the Scolithus- 
tubes under an angle of 60 degrees, while the latter always stand 
perpendicularly on the surfaces of deposit, which are not seen here. 
That this stone also occurs in the Dutch dilnvium, was already 
shown by van CALKER®); he proves that it is found in the erratic- 
bloeks of the Gron. Hondsrug. 
IT, Mid-Cambrian Stones. 
3. Limesandstone with Paradoxides-remains. 
In my collection I have also a piece of grey, fine-grained sand- 
stone with a large quantity of caleium-carbonate as binding-material. 
1) Van Canker, Ueber ein Vorkommen von Kantengeschieben und von Hyolithus- 
und Scolithus-Sandstein in Holland. Zeitschr. d. deutsch. geol. Gese'lsch. Jahrg. 
1890 pag. 583. 
2) Narnorst, Geol. Föreningens i Stockholm Förhandlingar 1879. Bd IV pag. 293. 
3) Dames, Geol. Reisenotizen aus Schweden. Zeitschrift der deutsch. geol. Gesell- 
schaft. Jahrg. 1881 pag. 417. 
4) Dames, Zeitschr. d. deutsch. geol. Gesellsch. Jahrg. 1890. Bd XLIIL pag. 777. 
5) Van Carker, Zeitschr. der deutsch. geoì. Gesellsch. Jahrg. 1891. Bd XLIII 
pag. 793, 
