. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. *^1 EXPLANATION OP JOGGINS BKCTION. 193 submergence of the swamps of the last group, and their invasion by sand-bearing currents. The next Subdivision commences with the growth of Calamites on the surface of the great sand-bed last noticed, after which there was the formation of an underclay and coal, the latter being afterwards inundated, and the pla
. The geology of Nova Scotia, New Brunswick, and Prince Edward Island, or, Acadian geology [microform]. Geology; Geology, Stratigraphic; Paleontology; Geology, Economic; Géologie; Géologie stratigraphique; Paléontologie; Géologie économique. *^1 EXPLANATION OP JOGGINS BKCTION. 193 submergence of the swamps of the last group, and their invasion by sand-bearing currents. The next Subdivision commences with the growth of Calamites on the surface of the great sand-bed last noticed, after which there was the formation of an underclay and coal, the latter being afterwards inundated, and the plants at its surface overgrown with Spirorbia. In the shale covering this coal, about fourteen feet above its surface, is a bed with shrinkage cracks, and containing a stool of Stigmaria, one of the roots of which was traced 9^ feet. Its rootlets were attached, so that it can scarcely have been a drift stump; and if now in situ, it must have grown on a mud-bank alternately inundated and dry, like the present salt-marshes of the Bay of Fundy. Fig. 36.âSectwn of Base of Erect SigUlaria. (a) Mineral charcoal. (i) Dark-coloured sandstonn, with plants, bonos, cte. (c) Oray sendBtones with Calamilea and Cordaitet, Subdivision XVIII. is a scries of sandstones and shales, less perfectly exposed than most other parts of the section. Chocolate colours prevail among the shales, and there are few fossils. One of the beds, however, has its surface covered with casts of shrinkage cracks, such as are now formed on mud left dry by the neap tides; and there are also erect Calamites in one bed and a Stigmarian underclay. The next group is of much greater interest, showing seven soil- surfaces, with a variety of sedimentary deposits. Two of the coals in this group contain on their surfaces of deposition well-preserved remains of the plants {SigUlaria, Cordaites, etc.) which must have grown on their undeixlays. A thick mass of sandstone and shale in the centre of the group is also very cu
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
