. Bulletins of American paleontology. 385 The Oligocene of the Southern United States 75 150 feet. The sandstones were first named by Wailes^^ from the bluff at Grand Gulf, of which a photograph is shown on the oppo- site page, where they are typical. Later they were described by Dr. Hilgardf as composed of coarse grains of pellucid quartz im- bedded in a mass of opaque white silex. The formation contains gypsum and magnesium salts. The Grand Gulf sandstones are chiefly exposed along the Pearl River and tributaries of the Mississippi. Elsewhere they are likely to be obscured with La- fayette s
. Bulletins of American paleontology. 385 The Oligocene of the Southern United States 75 150 feet. The sandstones were first named by Wailes^^ from the bluff at Grand Gulf, of which a photograph is shown on the oppo- site page, where they are typical. Later they were described by Dr. Hilgardf as composed of coarse grains of pellucid quartz im- bedded in a mass of opaque white silex. The formation contains gypsum and magnesium salts. The Grand Gulf sandstones are chiefly exposed along the Pearl River and tributaries of the Mississippi. Elsewhere they are likely to be obscured with La- fayette Helix Loess ^^^g^^ Kimlchen Sandy cla^sir^^s Sandstone Pebbles ,, . •*~^, Coarse wbih. ' ^^ Cross-bedded :^ friable sandstone I Sands and clay Sandstone Clay Sandstone Greenish sandy clays. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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