Geoscience Reference
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Amount of
quartz
Varve thickness (mm)
% Sagebrush
% Sodium
% Aulocoseira
0
2
4
051015 20 25 0
50
100
0.2
0.4
0.6
0.8 0
10
20
30
Pollen
Zones
0
1
White
Pine
2
3
Oak
Birch
4
5
Oak
Sagebrush
Grass
(Prairie)
6
7
8
9
Jack and
Red Pine
10
Spruce
11
Figure 2.2. Varve thickness, pollen content and sodium levels at Elk Lake (from Dean, 1997).
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