MICROPALE ONTOLOGY OF POSTGLACIAL DEPOSITS. 463 
D. 15 em. Sphagnum peat, bright brown, with a considerable number 
of large Calluna stems ; H = 5. 
E. 68 em.  Pine-moss peat, H = (7-)8 ; stools of pine. 
F. (at 83 cm.) Sand. 
The elen in which this moss is situated stretches from Achnashellach, near 
Loch Düghaill to Loch Carron, and Attadale. The vegetation is here of 
a very different character from that of the high mountain district between 
Glencarron over Achnasheen to Achaaralt. On the hillsides the forests, 
chiefly of birch and oak, attain a size but seldom met with in North Scotland. 
This fact must be taken into account when interpreting the pollen-diagram, 
which in some respects clearly differs from the diagrams so far deseribed. 
TEXT-FIG. à. 
‘0 10 20 30 40 50 60 70% 
[e aoa i A : 
| T | 2 
B L a 3 
JH "d 
c 4 rat ‘ 
/ 
lo | 
k 7 
IE p N 8 
/ | | ro — i 
\ - m 10 
Ie 
WF | | 
m I | 
—p— Alnus. —0— Betula. —e— Pinus, rere Ulmus. 
——— Quercus, —-------- Tilia, --m-- Corylus, 
The most salient feature is the great frequency of alder-pollen, which, for 
instance, in sample 8 forms one-half of the total tree-pollen (ef. p. 459, the 
alder-pollen maximum in. No. 2, which is only 14 per cent.). Itis probable 
that alder has played an important part in the composition of the forests 
which formerly surrounded Loch Carron at the time of the last fall and rise 
of the land. In a moss in S.W. Sweden (Erdtman, 1921, diagram 21, 
plate 8), two alder-pollen maxima occur: one in a stratum immediately 
above, another in a stratum immediately below, an intercalated bed of marine 
origin (Tapes Sea, Litorina subsidence), 
LINN, JOURN.—BOTANY, VOL, XLVI. 2M 
