DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY
The shore of the Southern Ocean at Blairgowrie, Victoria, Australia. The picture shows the effect of exposure to high energy seas on a hard stratified rock, the calcareous sandstone of the Bridgewater Formation. At low tide, as here, ledges of rock are exposed (top right), populated by both green algae (seaweeds) and brown algae (kelps). At slightly higher levels (right hand side, to bottom corner), the kelps are replaced by fucoid seaweeds (here, the brown alga Hormosira banksii). The highest rocks (centre and left) show clear sedimentary stratification in places, together with the presence of petrified material derived from plant roots, known as rhizoliths. Above high tide level (top left corner), xerophytic higher plants occupy sand dunes.
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