The Quarterly journal of the Geological Society of London . the layers of this sandstone are ripple-marked; and the sandstoneimmediately underlying one of the large stumps, which had been removed, was found to be distinctlyFig. 4.—Impression of tree- rippled, fig. 4. At Port Hood thestump in sandstone, with rip- beds dip gently toward the sea,pie-marks; from Port Hood. and at low tide a large surface of is of greater interest, showing seven soil-surfaces, intermixed with. the rock is exposed, with stonycasts of stumps projecting from it,and Stigmaria-roots spreading inall directions. a. Ripple
The Quarterly journal of the Geological Society of London . the layers of this sandstone are ripple-marked; and the sandstoneimmediately underlying one of the large stumps, which had been removed, was found to be distinctlyFig. 4.—Impression of tree- rippled, fig. 4. At Port Hood thestump in sandstone, with rip- beds dip gently toward the sea,pie-marks; from Port Hood. and at low tide a large surface of is of greater interest, showing seven soil-surfaces, intermixed with. the rock is exposed, with stonycasts of stumps projecting from it,and Stigmaria-roots spreading inall directions. a. Ripple-marks. Group XVIII. is a series ofsandstones and shales less perfectlyexposed than most other parts ofthe section. Chocolate coloursprevail among the shales, and onthe whole this group presents fewindications of terrestrial condi-tions. One of the beds, however,has a surface with shrinkagecracks, and we observed a bed oferect Catamites and a Stigmaria-soil. Group XIX.—The next group 24 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Nov. 2, sedimentary deposits. The lower part presents the usual succes-sion of underclays, coals, and shales ; and two of the coals containwell-preserved remains of the plants (Sigillaria, Poacites, &c.)which grew on their underclays. The highest coal of this grouphas undergone a temporary submergence, as its upper part con-tains Poacites covered with Sjrirorbis. That this submergence wasnot without mechanical deposition, is shown by th
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
