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Excerpt from Proceedings of the San Diego Society of Natural History: 1 July, 1990 Other fossils in the Upper Tesnus are less helpful in determining the age of the strata (king Fusilinid foraminiferans have been collected approximately 18 miles east of Marathon. These apparently indicate a lowermost Pennsylvanian age for the upper member, since they are equivalent to forams found in the Caney Shale of Oklahoma. Apparent monaxon sponge spicules have been found in the calcareous sandstones on the north slope of West Bourland Mountain south of Marathon, just below the plant hori zon. These objects, however, are black and appear to be phosphatic rather than siliceous. We noted similar objects in some of the shale beds along Rough Creek immediately above the novaculite, and we concluded that these were mineral inclusions in the shale. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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