Download e-book for kindle: An Introduction to Paleobotany by Chester A. Arnold

By Chester A. Arnold

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Slightly reduced. Ordovi- Falls, interpreted as an indication of clear water in which the sunlight was able to penetrate to the bottom. A tropical, climate is jnot^ necessarily assumed, although higher^ temperatures are known to favor the clevelop- menTl)rTrmestone~partly because of of. _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.

_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.

Direct evidence that bacteria existed during the latter part of the long pre-Cambrian era is supplied by minute dark objects found in the upper Huronian rocks of the Upper Peninsula of Michigan. These supposed bacteria consist of filamentous chains, which are sometimes branches of elongated cells resembling the living Chlamydothrix, an ironv The iron ores in which these remains were found depositing organism. are believed to have been deposited by organisms resembling those that make similar deposits today.

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An Introduction to Paleobotany by Chester A. Arnold


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