This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...mottled with pink and gray and faintly stratified at 3 feet below the summit. The upper and more massive 3-foot layer is flecked with minute spots of white, gray, yellow, and cream-tint; and the flecks are found on examination to consist of flue pulverulent material, apparently siliceous. The upper portion of the ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...mottled with pink and gray and faintly stratified at 3 feet below the summit. The upper and more massive 3-foot layer is flecked with minute spots of white, gray, yellow, and cream-tint; and the flecks are found on examination to consist of flue pulverulent material, apparently siliceous. The upper portion of the orange-red loam is more obdurate than either the superjacent Columbia loam or the subjacent semibedded material, and thus forms an outcropping ledge or cornice; and this ledge, as well as the subjacent mass to a less degree, is characterized by a smooth (almost semiglazed) surface, and a massive and rock-like aspect, such as has been found diagnostic of the formation elsewhere.1 The pebbles are subangular and rounded fragments of chert up to an inch and a half in diameter, sparsely disseminated in the massive summital ledge, and both disseminated and arranged in lines in the lower portion. The exposed thickness of the Lafayette deposits is about 10 feet. Near Bayou Sara there are several less noteworthy exposures of Lafayette loam, which is sometimes sharply demarked from the subjacent brown loam of the Columbia, though elsewhere the two deposits intergrade in such manner that they may not be demarked save by an arbitrary line. In general the exposures of the Lafayette are definitely related to the configuration. Hereabouts the prevailing surface is a plane of Columbia loam slightly inclined seaward and partially invaded by dendritic drainage ways in such manner as to give a nascent autogenetic configuration of wonderfully youthful aspect; the prevailing profile is a horizontal or slightly inclined line broken by sharpcut V-shaped depressions; the roads traversing the country pass from plane to ravine and from ravine to plane through cuts, sometime...
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Add this copy of The Lafayette Formation to cart. $95.00, very good condition, Sold by Xerxes Books rated 5.0 out of 5 stars, ships from Glen Head, NY, UNITED STATES.