zl 
un 
1912. No. 8. THE QUATERNARY SECTION OF KILEBU. 
IV. 
On account of the facts just mentioned, we do not find any fixed 
limit between this division and the preceding one. The transition, more- 
over, seems to be continuous. This layer, having a thickness of 15 cm., 
is for the most part built up from gravel, sand, and clay; fragments of 
molluscan fossils are only very scarce. A rather interesting phenomenon 
ought here to be mentioned. When scrutinizing this division we find 
the lower and upper part of it to be more gravellous, whereas the 
middle one is of a more clayey character consisting of gravel mixed 
with clay and containing small portions of clayey material. In the lower 
half of the division we especially meet with fragments of Pecten islan- 
dicus Müzr. and Mya truncata L. var. uddevallensis: some scarce frag- 
ments of a very small variety of Mytilus edulis L. were also seen, and, 
moreover, scattered fragments of Balanus crenatus Bruc. Darw. and a 
single fragment of a small and oblique variety of Macoma calcaria 
CHEMN. were also found. Here we ought to pay close attention to the 
fact that the occurrence of Mytilus edulis L. is especially bound up in 
the clayey portions. The upper half of the division is found to contain 
more species as we also, beside the above mentioned molluscan and 
crustacean ones, meet with scattered fragments of Astarte compressa L., 
Sazicava pholadis L. juv., Natica clausa Bron. & Sows., and Buccinum 
sp. of different species and varieties. 
V. 
This division proves to be transitional from the preceding one as 
the lower part of it is rather gravellous but higher up this layer proves 
to be a true clay deposit of the usual bluish grey colour. It has a 
thickness of 7; cm. Through the whole layer we find it to be mixed 
up with sand and gravel Fragments of the common mussel, Mytilus 
edulis L. were rather numerous, more especially in the upper part of 
the layer. In addition to this most characteristic species we also find 
fragments of Pecten islandicus Müzz. 
VI. 
This layer having a thickness of 5 cm. is in the lower part scarcely 
at all to be distinguished from the preceding one. The composition of 
clay and fragments of shells is nearly the same, as well as the occur- 
rence of Mytilus edulis L. and Pecten islandicus Müzz. Higher up it 
turns into a true Mytilus-clay. Moreover, we also find fragments of 
Azınus flexuosus Mont. and Buccinum sp. in different varieties of such 
