Contributions to the Knowledge of the Older Mesozoic Flora of VirginiaU.S. Government Printing Office, 1883 - 144 pages |
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Page 3
... of the area . Here I was fortunate enough to find some material that had been taken out of a gangway cut to tap the lower coal bed . The roof shales of this bed are rich in plants , but GEOLOGY OF THE MESOZOIC AREAS . 3.
... of the area . Here I was fortunate enough to find some material that had been taken out of a gangway cut to tap the lower coal bed . The roof shales of this bed are rich in plants , but GEOLOGY OF THE MESOZOIC AREAS . 3.
Page 6
... lower group of these areas is usually characterized by the large amount of red strata present and the absence of traces of vegetable matter except silicified wood . The upper group or member varies in character with the locality , but ...
... lower group of these areas is usually characterized by the large amount of red strata present and the absence of traces of vegetable matter except silicified wood . The upper group or member varies in character with the locality , but ...
Page 7
... lower group in the Richmond Coal Field are mostly sandstones , rather coarse in texture , and sandy shales . They are often much indurated and affected by " slickensides " and small local dis- turbances . The lowest sandstones are not ...
... lower group in the Richmond Coal Field are mostly sandstones , rather coarse in texture , and sandy shales . They are often much indurated and affected by " slickensides " and small local dis- turbances . The lowest sandstones are not ...
Page 8
... lower persistent bed is found near the base of the middle group of the strata . South of James River it is from 4 to 5 feet thick , and is worth but little for fuel in comparison with the bed next above it . Hence its horizon is rarely ...
... lower persistent bed is found near the base of the middle group of the strata . South of James River it is from 4 to 5 feet thick , and is worth but little for fuel in comparison with the bed next above it . Hence its horizon is rarely ...
Page 9
... lower bench .... 4. Interval , sandstone and shale . 3. Lower persistent coal bed 2. Interval , sandstones and shales , about 1. Gneissic floor . Thickness . 4 feet . 14 feet . 12 inches . 12 feet . 14 inches . 25 feet . 18 inches . 40 ...
... lower bench .... 4. Interval , sandstone and shale . 3. Lower persistent coal bed 2. Interval , sandstones and shales , about 1. Gneissic floor . Thickness . 4 feet . 14 feet . 12 inches . 12 feet . 14 inches . 25 feet . 18 inches . 40 ...
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Common terms and phrases
Acrostichides rhombifolius appear Area Asterocarpus Virginiensis Baiera Baiera multifida base beds branches Bunbury Carbon Hill Carolinensis centimeters Cheirolepis Cheirolepis Münsteri Cladophlebis Clover Hill coal seam compound pinna compound sterile pinna Ctenophyllum Braunianum Cycadites cycads Cyclopteris decurrent Emmons Emmons's epidermis Equisetum Rogersi fertile pinnules figure forking Formation and locality.-Found Fragment frond fructification genus Geol GEOLOGICAL SURVEY gives horizon insertion Jurassic Laccopteris lateral nerves leaf leaflets leaves lobes Lockville lower magnified to show magnifolia main coal margin Mertensides bullatus middle nerve midrib narrow Neuropteris normal North Carolina nules obliquely older Mesozoic Oölite Pages Palissya Pecopteris Pinnules of Fig Plate Podozamites principal rachis Pseudodanæopsis Pterozamites represents resembles Rhætic ribs Richmond Coal Field right angles sandstone Schenk Schimper Schizoneura seen segments shale show nervation show the nervation slender sori spec species specimen sporangia stem strata subopposite summit thick Triassic tripinnate ultimate pinnæ upper Virginia fossil Virginia Mesozoic Walchia width Zamites