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At the base of the Cambrian strata in Sweden, which in the neighbourhood of Lake Wener are perfectly horizontal, lie ripple-marked quartzose sandstones with worm-tracks and annelid borings, like some of those found in the Harlech grits of the Longmynd. Among these are some which have been referred doubtfully to plants. These sandstones have been called in Sweden "fucoid sandstones."
The surface had weathered to a whitish-gray, but still in tiny depressions its pristine dark color showed in rugose characters. A splintered fissure held delicate fucoid impressions in fine script full of meaning.
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