Maryland Geological Survey: Upper Cretaceous. 2 ptsJohns Hopkins Press, 1916 |
Términos y frases comunes
Acad Alabama angle Anne Arundel County apex basal base beaks Brightseat Brooks estate Bull camptodrome cardinal Cecil County Cenomanian Check List Inv Club Collection.-Maryland Geological Survey Conrad convex costæ Creek Cret cretacea Description.-Leaves dorsal margin elongated estate near Seat Exogyra Exogyra costata zone Ficus figs Fossils Gabb genus Grove Point Heer hinge line Hollick Ibidem Jersey Jour lateral margin left valve Lesquereux ligament Linné lobes Magnolia Magothy formation Martesia Maryland Matawan Merchantville midrib Mississippi Monmouth formation Newberry obliquely Occurrence.-MAGOTHY FORMATION Occurrence.-MONMOUTH FORMATION outline pallial line Pecten Petiole Phila Philadelphia Academy Platanus posterior Prince George's County prominent radial Raritan formation right valve Round Bay Sassafras sculpture Seat Pleasant Secondaries shell slightly species specimens stout thin Tippah counties Torrey Bot transversely truncate U. S. Geol U. S. National Museum umbones UPPER CRETACEOUS Velenovsky ventral margin Weller Whitfield width Williamsonia xxxvii
Pasajes populares
Página 680 - ... ridge or process extends along the middle of the alation, as in T. alaeformis. Type locality: Eufaula, Ala. Miss Gardner adds the following details : Shell thick, heavy, prismatic, rudely trigonal in outline, moderately convex; umbones anterior, incurved, opisthodetic, flattened upon their summits but prominent by reason of their position at the apex of an angle of approximately 120°; lunule not differentiated, escutcheon defined, not only by the sculpture but also by an abrupt change in the...
Página 801 - Secondaries numerous, sometimes as many as 20 pairs; they branch from the midrib at angles of about 45° and are parallel and camptodrome. Unfortunately, the name given this species was used for another by Forbes in 1829, so that it becomes necessary to rename it, and no name can be more appropriate than that of its distinguished describer...
Página 817 - Newberry was somewhat uncertain as to its relationship with Magnolia and compared it with Aristolochia, Polygonum, and Toxylon. The latter is the only genus which is at all suggestive, and it furnishes no instances of auriculate bases, while this character of the base prevails in more than one modern species of Magnolia. The outline, the consistency, and the venation are all in accord in pointing to Magnolia as the proper generic reference. This is one of those forms mentioned from Marthas Vineyard...
Página 671 - Hinge line arcuate ; anterior margin regularly rounded from the extremity of the hinge line to the middle of the basal margin ; postero-basal margin a little more sharply rounded ; posterior margin convex, a little straighter than the anterior. Valves strongly convex or gibbous, most prominent, but not at all angular, along an oblique line from the beaks to the posterobasal extremity, the posterior slope more abrupt than the anterior. Muscular impressions large, the anterior ones deeply impressed...
Página 682 - Ibidem, p. 185, pl. xxv, figs. 6-8. Legumen ellipticum Whitfield, 1885, Ibidem, p. 184, pl. xxv, fig. 5. Legumen planulatum Johnson, 1905, Proc. Acad. Nat. Scl., Phila., p. 17. Legumen appressum Johnson, 1905, Ibidem. Legumen ellipticum Johnson, 1905, Ibidem. Legumen planulatum Weller, 1907, Geol. Survey of New Jersey, Pal., vol. iv, p. 612, pl. Ixix, figs. 3-7. Description. — " Elliptical, compressed, sides flattened ; end margins rounded ; hinge and basal margins nearly parallel." — Conrad,...
Página 766 - These are broadly ovate in shape with very thin guard cells (at least when viewed on the surface). They are arranged in somewhat irregular rows on the ventral surface of the leaf, the number of rows between the two veins being usually four. Aside from the foregoing facts, the preservation is such that no other details can be made out. This species is most remarkably similar to the recent Araucaria bidwilli of the Australian region.
Página 616 - Pal., vol. iv, p. 512, pl. lvi, figs. 9-12 (ex parte). Description. — " Tube subcylindrical, nearly straight, gradually tapering, broadest on the dorsal surface ; opposite face narrow, rounded ; extremity abrupt, rounded and faintly subtrilobate. Shell subquadrate. Beaks terminal, and projecting beyond the buccal end of the shell, very much incurved, so as to appear somewhat spiral. Umbones broad, slightly flattened in the middle. Cardinal margin straight anteriorly, depressed posteriorly, merging...
Página 849 - Leaves elongate-lanceolate, somewhat flexuous. about 12-13 cm. in length by about 2 cm. in greatest width, which is about midway between the apex and the base ; from this point they narrow gradually apically into an attenuated, acuminate, usually curved tip, and basally into a long, narrowly cuneate base.
Página 831 - C. foliolis membranaceis, breviter petiolatis. pollicaribus, ovalibus, integerrimis, basi attenuatis, apice profunde emarginatis ; nervis secundariis subtilissimis, camptodromis." Heer 1882. Newberry's specimens from Woodbridge, if they are referable to this species at all, are abnormal or possibly incomplete since the base is much unlike the usual leaves of this species. A typical specimen, however, has been found at South Amboy (Allen pit). Occurrence. — Woodbridge, South Amboy. Collections.
Página 749 - Gleichenia was a prominent one during the Cretaceous with many characteristic species, some with a wide range. The present species which ranges through the Greenland Cretaceous series from the...