An Introduction to Paleobotany by Chester A. Arnold

By Chester A. Arnold

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As 3 feet in diameter, with a smooth or irregularly ribbed and some Gasp6 much nodose surface. Internally the trunks reveal a series of concentric; layers resembling the annual rings of temperate zone trees, and radiating outwardly are narrow strips of tissue simulating medullary rays. Microscopic examination of the tissue reveals a system of nonseptate In Prototaxites Loganij the species described by Dawson, the tubes are of two sizes, large ones ranging from 13 to 35 microns in diameter and smaller ones 5 to 6 microns across (Fig.

Palaeochara is a late Carboniferous genus with six spiral cells. Palaeonitella, from the Middle Devonian Rhynie chert, is a doubtful member but other possible Devonian ones are Trochiliscus and of this order, Sycidium. Although the red algae (Rhodophyceae) are among the most important of the rock builders in the Recent tropical seas, some investigators Neverbelieve that they played a lesser role during the early Paleozoic. very abundant Paleozoic algae are assigned to this class. known is Solenopora (Fig.

Algal colonies consist of aggregates of dome-shaped or roughly spherical masses that when sectioned are seen to be made of The irregular concentric laminae typical of algal limestones in general. organism mainly responsible for the formation of these Green River reefs is Chlorellopsis coloniata, Wyoming, it and at one locality in Sweet water County, silicified branches has formed thick lime deposits around the of trees (Fig. 25), a spherical organism surrounded by a thin calcium carbonate. The spheres range from 110 to 140 microns in diameter, and usually occur in clustered Chlorellopsis coloniata is shell of interlocking grains of colonies although rarely in chains genus Chlorella.

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