. The geological history of plants. Paleobotany; 1888. 30 THE GEOLOGICAL HISTORY OF PLANTS. markings referred to PalcBOchorda, Palmphycus, and ScoUthus have their places here. Many examples highly illustrative of the manner of formation of the impressions are afforded by Canadian rocks (Fig. 8). Branching forms referred to Licrophycus of Billings, and some of those referred to Buthotrephis, Hall, as well as radiating markings referable to ScotoUthus, Gyrophyllites, and As- terophycus, are ex- plained by the branch- ing burrows of worms illustrated by Nathorst and the author. As- tropolithon, a
. The geological history of plants. Paleobotany; 1888. 30 THE GEOLOGICAL HISTORY OF PLANTS. markings referred to PalcBOchorda, Palmphycus, and ScoUthus have their places here. Many examples highly illustrative of the manner of formation of the impressions are afforded by Canadian rocks (Fig. 8). Branching forms referred to Licrophycus of Billings, and some of those referred to Buthotrephis, Hall, as well as radiating markings referable to ScotoUthus, Gyrophyllites, and As- terophycus, are ex- plained by the branch- ing burrows of worms illustrated by Nathorst and the author. As- tropolithon, a singular radiating marking of the Canadian Cambri- an,* seems to be some- thing organic, but of what nature is uncer- tain (Fig. 9). Rhabdichnites and Eopihyton belong to im- pressions explicable by the trails of drifting sea-weeds, the tail-markings of Crustacea, and the ruts ploughed by bivalve mollusks, and occurring in the Silu- rian, Erian, and Carboniferous rocks. \ Among these are the singular bilobate forms described as Rusophycus by Hall, and which are probably burrows or resting-places of crustaceans. The tracks of such animals, when -walk- ing, are the jointed impressions known as ArtJiropJiycus and Orusiana. I have shown by the mode of occurrence. Fio. 8.—Paloeophycua Seoertyensis (Bill- ings), a supposed Cambnan Fucoid, but probably an animal trail. * Supplement to " Acadian Geology.'' t "Canadian Naturalist," Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, John William, Sir, 1820-1899. New York, D. Appleton and Company
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