By Chester A. Arnold
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Extra resources for An Introduction to Paleobotany
Slightly reduced. Several forms of algal limestones have recently been described from the Pennsylvania rocks of central Colorado. They consist of simple forms (Pycnostromd) and large colonies that are described under such names as Shermanophycus, Gouldina, Stylophycus, Artophycus, CalypThe tophycus, and others believed to belong to the Myxophyceae. outer surface of Shermanophycus is irregularly pitted and resembles a Internally, the colony consists of a thin basal mass of concentric structure surrounded by fingerlike branching outirregular cauliflower.
_incre^&ed^lga^ growth, ^Most and partly he precipitated calciiim carbonate in because^UrtKeJesse^jo]^^ warrrf However, in cojxi cliniates calcareous waiter. algae flourish in limestones. yar^Jrpm & few inches cemented togetherjaterally. to several feet in extent. The individual head usually has in the center or towarH^the base a pebble, shell, or other object which served as the The original substratum to which the algal filaments were attached. THE NONVASCULAR PLANTS calcium carbonate 55 be deposited as a crust surrounding the surface may settle out as a precipitate to form a lime mud after death ^f the plants^ In the former case the filaments may be preserved, but selcTonf'are in the latter.
Algae (Phaeophyceae), being noncalcareous, have not entered as strongly into the fossil record as the three classes just men- FlG. 19. tiolenopora compact d. Upper Ordovician. ^ natural sizo. Various imprints resembling Fucus and other genera of seaweeds in rocks of all ages from the early Paleozoic to the present but their value as authentic occurrences of these plants is seldom great. Most of those objects which are indiscriminately called "fucoids" and tioned. have been found which are found especially in the Devonian are inorganic.
An Introduction to Paleobotany by Chester A. Arnold