Reports Dealing with the Systematic Geology and Paleontology of Maryland., Band 5Johns Hopkins Press, 1913 "Bibliography [of the eocence deposits of Maryland]," vol. 1, p. 31-43. |
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
aperture beak beds brachial brachiopods bryozoa cardinal Cash Valley Cherry Run chert Chonetes Chonetes jerseyensis Cobleskill Coeymans Collection.-Maryland Geological Survey Collection.-U. S. National Museum concave convex corallites Corriganville crinoids Cumberland Dalmanella depressed Description Devil's Backbone Devonian diameter dorsal valve Eatonia elevated fauna Favosites Fenestella figs fossils furrows Genus Geol gray limestone Hall and Clarke Helderberg HELDERBERG FORMATION hinge-line Hist incurved KEYSER MEMBER Knobly Mountain lamellæ Length limestone lobes Lower Devonian Manlius Maryland Meristella mesial N. Y. State Mus nodular Occurrence.-HELDERBERG FORMATION Occurrence.-ORISKANY FORMATION Ohern Oriskany ORISKANY FORMATION plications posterior pygidium radiating Rept Rhipidomella RIDGELY MEMBER rounded sandstone Schuchert Schuchertella SCOTLAND MEMBER shale shell Shriver side Silurian sinus slightly species specimens Spirifer striæ Stromatopora Stropheodonta Strophonella Surface marked Tentaculites thickness vertical feet Thin-bedded Tonoloway transverse U. S. National Museum Ulrich Uncinulus upper ventral valve Weller West Virginia width York zone
Beliebte Passagen
Seite 46 - The Geology of Pennsylvania. A Government Survey, with a General View of the Geology of the United States, essays on the Coal Formation and its Fossils, and a description of the Coal Fields of North America and Great Britain. Illustrated with plates and engravings in the text. 3 vols. 4to, cloth, with portfolio of maps i5 oo ROSE (JOSHUA, ME ) The Pattern-makers
Seite 48 - Bryozoa. Text and plates, containing descriptions and figures of species from the Lower Helderberg, Upper Helderberg, and Hamilton groups, by James Hall, State geologist and palaeontologist, assisted by George B.
Seite 34 - every proper encouragement and support" was given to them. The construction of canals and railroads required large amounts of capital. The Chesapeake and Ohio Canal and the Baltimore and Ohio Railroad were the two outstanding corporations of the period among the railroads and canals. The original capital stock of the former was $6,000,000 and that of the latter was $3,000,000. Neither sum was sufficient to complete the project for which it was raised. General familiarity with the period of internal...
Seite 237 - Shell in the young state longitudinally subovate, and varying from circular to transversely oval in its stages of growth, resupinate. Ventral valve convex at the beak, flattened in the middle, and concave towards the front. Dorsal valve very convex in the middle and towards the beak; beaks of the two valves nearly equally elevated; that of the ventral valve pointed; area very small; foramen large. Surface finely striated ; striae frequently bifurcating and curving towards the lateral and cardinal...
Seite 64 - strongly compressed beds," with a "system of reversed folds. . . . All these folds consist of Devonian rocks, altogether probably at least 20,000 feet thick. " Within the Devonian rocks themselves no unconformity has yet been found, and .the whole succession seems to have been deposited without any important check, and passes up without break into the overlying Culm.
Seite 175 - Corallum consisting of large, lenticular, depressed convex or hemispherical masses; base covered by a strongly wrinkled epitheca. Cell tubes polygonal ; their inner surface showing evidence of a few strong longitudinal striae. Septa frequent, from ten to fifteen in the space of 10 mm. ; thickness equal to that of the cell walls. Mural pores in one or two ranges, comparatively large, circular, with margins distinctly elevated. Cell walls thin, but frequently much thickened near the surface by silification,...
Seite 47 - Virginia ; a Geographical and Political Summary, embracing a description of the State, its geology, soils, minerals, and climate ; its animal and vegetable productions ; manufacturing and commercial facilities ; religious and educational advantages ; internal improvements and form of government.
Seite 188 - Basal pectinirhomb with about 60 dichopores, that of plates 12 and 18 with 80, and of 14 and 15 with 90. Madreporite quite large for Pseudocrinites, but the hydropore is exceedingly minute. Anal area small, composed of 2 circles of plates ; the outer has 7 nodose pieces and the inner depressed pyramid has the same number of plates. Column slender, but its length is unknown. Comparisons. — This species is readily distinguished from all other Pseudocrinites by the strongly stellate sculpturing of...
Seite 43 - Observations on the Geology of the United States of America, with some remarks on the effect produced on the nature and fertility of soils by the decomposition of the different classes of rocks. With two plates. 12mo. Phila., 1817. 1818. MACLURE, WM. Observations on the Geology...
Seite 70 - ... the Helderbergian fauna are derived from the Siluric. On the other hand, in some of the trilobites, Bryozoa, and pelecypods, many of the gastropods, but more particularly in the diversified brachiopods, are met organic groups, which in their culmination are characteristic of the Devonic. It can not be denied that the Helderbergian fauna has a Siluric facies, yet these types either have greater differentiation in species or the forms attain a larger size. The fact that...