The Potomac Or Younger Mesozoic Flora, Part 1

72d mile-post acute alternate Angiopteridium angle Aspidium Baiera Baieropsis Baltimore basal base bipinnate bipinnate or tripinnate Brachyphyllum Brongn Brooke Buchianus Carpolithus Cladophlebis closely placed cones conifers cycads decurrent diverging Dutch Gap Canal elliptical Eocene ferns Fishing hut flabellately Flor forking Foss fossils fragments Fredericksburg Frond Frond bipinnate genus Glyptostrobus Heer Hill-side near Potomac hut above Dutch Jurassic lateral nerves leaf leaf-substance thick leaflets leaves lignite lobes Locality lower Potomac margin Mesozoic midnerve midrib Nageiopsis narrowed Neocomian nervation obliquely oblong obtuse ovate Pecopteris petiole pinna pinnate pinnules Plate Podozamites portion Potomac flora Potomac formation Potomac plant Potomac Run primary nerves principal rachis rachis rare Rhætic Road-side near Potomac sand Sapindopsis Schenk seen Sequoia shape shows side slender slightly sori species specimens Sphenolepidium Sphenopteris stems stout subopposite summit Taxodium teeth Thyrsopteris tips tooth Trent's Reach tripinnate ultimate pinnæ upper Variegated Clay Virginiensis Wealden Zamites