. Elements of geology : a text-book for colleges and for the general reader. Geology. 474 MESOZOIC EKA—AGE OF REPTILES. Lowee Tertiary. AMERICAN. EUROPEAN. Western Plains. Atlantic Border. Wahsatch and Puerco beds. Eo-lignitic. Plastic clay,Thanet sands. ; Transition. Laramie. Wanting. Wanting. Cretaceous. Upper 1 Foxhi11 SrouP- 11 ( Colorado group. group. Lower. Comanche group. N. J., Penn., and Miss. Wanting. Wanting. j White chalk. 1 Gray chalk. S Upper Greensand ( Gault. Neocomian. Transition. Trinity beds. Eaptanodon beds. Potomac formation. Wealden. Upper Jurassic. Wanting.
. Elements of geology : a text-book for colleges and for the general reader. Geology. 474 MESOZOIC EKA—AGE OF REPTILES. Lowee Tertiary. AMERICAN. EUROPEAN. Western Plains. Atlantic Border. Wahsatch and Puerco beds. Eo-lignitic. Plastic clay,Thanet sands. ; Transition. Laramie. Wanting. Wanting. Cretaceous. Upper 1 Foxhi11 SrouP- 11 ( Colorado group. group. Lower. Comanche group. N. J., Penn., and Miss. Wanting. Wanting. j White chalk. 1 Gray chalk. S Upper Greensand ( Gault. Neocomian. Transition. Trinity beds. Eaptanodon beds. Potomac formation. Wealden. Upper Jurassic. Wanting. Purbeck. Life-System: Plants. Leaf-impressions are very abundant in the American Cretaceous, and the most cursory examination reveals at once a type of plants not seen in any lower rocks, viz., Angiosperms, both Dicot}'ls and Palms. We have said that the Sierra revolution at the end of the Jura-Trias produced important changes in America. A great break in the record occurs at this time in the region (the Plains) where these plants were found. When the record commences again in the Dakota epoch we observe a very great difference in the subject-matter. The whole as- pect of field and forest must have been different and much more mod-. Fig. 763. Fig. 764. Fig. 765. Figs. 763-765.—Cretaceous Plants, Dakota Grout (after Lesquerenx): 763. Liquidambar in- tegrifolium. 764. Laurus Nebrascensis. 765. Quercus primordialis. All 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 LeConte, Joseph, 1823-1901. New York : D. Appleton and Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1892
