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My examination here was very short: the cliffs are about a hundred feet high; the lower third consists of yellowish-brown, soft, slightly calcareous, muddy sandstone, parts of which when struck emit a fetid smell. In this bed the great Ostraea Patagonica, often marked with dendritic manganese and small coral-lines, were extraordinarily numerous. I found here the following shells:
The interval between them and the main-land is gradually filling up by a process similar to that by which the islands themselves were formed. The gentle landward slope of the Reef and the channel between it and the shore are covered with a growth of the more branching lighter Corals, such as Sea-Fans, Coral-lines, etc., answering the same purpose as the intricate roots of the Mangrove-tree.
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