The book Class-Book of Geology was written by author Archibald Geikie Here you can read free online of Class-Book of Geology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Class-Book of Geology a good or bad book?
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They were composed of a homy or chitinous substance, and hence they commonly present themselves merely as black streaks upon the stone. Each graptolite was a colony comprising many individuals which occupied each its own cell. The cells are in some kinds placed in a row on one side of ^ The fractional numbers inserted within parentheses in the titles of the figures of fossils indicate how much the figures have been reduced or magnified. Thus ^= reduced one-third ; J = magnified four times, XVII... CAMBRIAN 243 a supporting rod or axis ; in other kinds there is a row of cells on both sides (see Fig. 121). Some varieties are straight, others curved Fig. 116. — Oldhamin radiata (natural sueX Ireland. or spiral. Some are simple branches, others are composed of two or more branches, while in certain types a large number of separate branches is united in one common centre. One of the most Fig. XX7.— Hydrozoon from the Cambrian rocks {Dtctyograptus {Diciyonema) sociale\ natural size. ancient hydrozoa is Dictyograptus {Dictyonema^ Fig.
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