. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 520. Fig. 522. Figs. 520-522.—Carboniferous Corals: 520. Lithoetrotion Californiense (after Meek). 521. Cli- siophyllum Gabbi (after Meek). 522. a, Archimedes Wortheni (after Hall); b, portion of same, enlarged to show structure. out, what important families are coming in, and a few which are very characteristic. We shall dwell only on what bears on the progress of life. Among corals the same general characteristic Palaeozoic type (Quad- ripartita) continues to prevail, though in greatly-diminished varie
. Elements of geology : a text-book for colleges and for the general reader. Geology. Fig. 520. Fig. 522. Figs. 520-522.—Carboniferous Corals: 520. Lithoetrotion Californiense (after Meek). 521. Cli- siophyllum Gabbi (after Meek). 522. a, Archimedes Wortheni (after Hall); b, portion of same, enlarged to show structure. out, what important families are coming in, and a few which are very characteristic. We shall dwell only on what bears on the progress of life. Among corals the same general characteristic Palaeozoic type (Quad- ripartita) continues to prevail, though in greatly-diminished variety of families; for the Favositidas and Halysitidae have passed away, and only the Cyathophylloids, or cup-corals, remain. The most beautiful and characteristic are the Columnar Lithostrotion (Fig. 520), a polyp- coral, and the curious corkscrew-like Archimedes (Fig. 522), a Bryozoan. Among Crinoids, the Cystids no longer exist, for they passed out with the Silurian, but the Blastoids and Crinids (Figs. 523-530) in- crease in number and beauty. Also among free Echinoderms the As- teroids (Fig. 533) are more abundant, and Echinoids (Figs. 531 and 532) are introduced for the first time. Fig. 534 represents the distri- bution of these orders in time. /. 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
