By Chester A. Arnold
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Additional info for An Introduction to Paleobotany
Since the limy substance may of the algal filaments, or it increases by accretion, definite layering often results. In many limestones these layers are nearly concentric around the central nucleus, but in others they may be thicker toward the top, or they may be irregularly formed. Algal limestones exhibit such a variety of forms that classification is In general, however, they may be gi^upedjiiidei^jj simple or difficult. and (2) jarge_coTonial forms. JLangular masses, usually under an inch in diameter, which argjsemented together by lime mud.
They found a great variety of spherulitic and rodlike objects, which they Micrococcus Zeilleri is described as species of Micrococcus and Bacillus. cuticular membranes which make " up the so-called paper coal" found at Toula in Russia. Renault believed that these objects were the remains of the organisms responsible for the disintegration of the cellular tissues of the plants that compose the coal seam. He had no proof of this, however, and other investigators have been inclined to discount his theory.
It has cells mm. long, which are held together in groups by a transparent The resemblance to the living genus Gloeocapsa is obvious. 08 matrix. Nostoc, and Marpolia, which has some likeness to the recent Schizothrix. are believed to have existed in large numbers The Chlorophyceae during the Paleozoic. The oldest fossil believed to represent this class Oldhamia from the Lower Cambrian. It exists as an impression of an articulated stem bearing whorls of closely set branchlike structures. is THE NONVASCULAR PLANTS Because of its resemblance to the recent Halimeda, 47 it is provisionally classed with the Codiaceae.
An Introduction to Paleobotany by Chester A. Arnold