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By Chester A. Arnold

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Extra resources for An Introduction to Paleobotany

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Plants occur in rocks of all ages from the Silurian to the silica is believed to have originated mainly from two The Ash has provided sources, volcanic ash and the waters from hot springs. the silicates for the petrifaction of most of the logs in the Mesozoic and Cenozoic deposits of the western part of North America. The upright trunks exposed on Amethyst Mountain and Specimen Ridge in Yellowstone Natioual Park were preserved by the heavy layer of ash that was thrown from near-by volcanoes during early and middle Ge^ozoic times.

Rhabdoporella, CyclocrinuSj and Prismocorallina are early forms attributed to the Dasycladaceae that date back to the Ordovician. Rhabdoporella is a small cylindrical unbranched form, which may be the ancestral type for the other members of the family. Cyclocrinus produces large delicate heads about 8 mm. in diameter, with a thinly calcified surface consisting of compactly fitting enlarged tips of the appendages In Prismocorallina the branches tips. that arose from the swollen axis were irregularly placed, not forming a definite surface layer.

These fungi bear some resemblance to the Peronosporales and Saprolegniales, although their actual affinities are unknown. The foliage of Carboniferous and later plants sometimes bears small , spots resembling the hard fruiting bodies of the Pyrenomycetes. HysterOther Cordaitis occurs on the long strap-shaped leaves of Cordaites. ites AN INTRODUCTION TO PALEO BOTANY 44 pyrenomycetous fruiting bodies have been found on the leaves and Miocene angiosperms. of Eocene The Discomycetes are very meagerly represented in the fossil series although such names as Pezizites, Aspergillites, and others implying resemblances to discomycetous genera have been assigned to Cenozoic and more recent remains.

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