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It predominantly grows on the lower shore, especially where fucoid algae are absent, but is also found further up shore on exposed coasts.
However, even though annual kelp production is higher, the productivity of individual plants is lower due to lower biomass accumulation of fucoid algae.
Continuous salt spray is not a feature of sheltered shores and, except where fucoid seaweeds offer shelter (Menge, I 976), desiccation may be significant.
These sandy beds are often found covered with ripple-marks and annelid tracks; one of the uppermost sandy layers is known as the " Fucoid bed " from the abundance of the seaweed-like impressions it bears.
It is composed of the following subdivisions in ascending order: falsebedded quartzite, Pipe Rock quartzite, fucoid beds and Olenellus band, serpulite grit, Durness dolomite and marble, Durness dolomite and limestone: but these are not always visible at any one spot.