By Chester A. Arnold
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Extra info for An Introduction to Paleobotany
58, 1935. : Algal reefs and oolites* in the Green River formation, U. S. Geol. Survey Prof. Paper 154 G, 1929. : Muscineac, Foss. , II. Plantac, Pars 13, Berlin, 1927. A. FENTON: Algal reefs or bioherms in the Belt series of Montana, Geol. Soc. America Bull. 44, 1933. Pre-Carnbrian and early Paleozoic algae, Amer. Midland Naturalist, 30 (1), : 1943. : State Mus. Algal barrier reefs in the Albany, 1938. Lower Ozarkian of New York, New York Bull.
19), which ranges from the Ordovician to the Jurassic. Solenopora produced biscuit or headlike limestone masses with a lobate surface which, when sectioned vertically, theless, certain One of the best are seen to consist of faintly visible radiating lines (the algal filaments) and wavy concentric bands which probably represent seasonal accretions. A Recent member of the Rhodophyceae which extends back into the The thallus of this plant forms a hard stony is Lithothamnium. mass on the surface of a submerged rock, and the exposed surface is Triassic AN INTRODUCTION TO PALEOBOTANY 48 irregular or warty.
Of any kind have been assigned with certainty No spores or fructifications to any species of Prototaxites. When Dawson proposed the name Prototaxites he was impressed by the presence within the large tubes of structures resembling the spiral bands found within the tracheids of the Recent Tax us. Later investigations, however, showed the supposed wall sculpturing was more likely the result of partial disintegration of the walls, and that the tubes do not resemble the tracheids of either ancient or modern conifers.
An Introduction to Paleobotany by Chester A. Arnold