Contributions to the Knowledge of the Older Mesozoic Flora of Virginia

Acrostichides rhombifolius appear Area Asterocarpus Virginiensis Baiera base beds branches Bunbury Carbon Hill Carolinensis centimeters Cheirolepis Cladophlebis Clover Hill coal seam compound pinna compound sterile pinna Ctenophyllum Braunianum Cycadites cycads Cyclopteris decurrent Emmons Emmons's epidermis Equisetum Equisetum Rogersi fertile pinnules figure forking Formation and locality.-Found Fragment frond fructification genus Geol GEOLOGICAL SURVEY OLDER gives horizon insertion Jurassic Laccopteris lateral nerves leaf leaflets leaves lobes Lockville lower magnified to show magnifolia main coal margin Mertensides bullatus MESOZOIC FLORA PL middle nerve midrib Neuropteris North Carolina nules obliquely OLDER MESOZOIC FLORA 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 shale show nervation show the nervation slender sori spec species specimen sporangia stem strata subopposite summit SURVEY OLDER MESOZOIC thick Triassic tripinnate ultimate pinnæ upper Virginia Mesozoic Walchia width Zamites