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Abstract Acad American Museum basin beds Beyrichia bifurcating brachiopods branches bryozoa Bull Calif Canada Canadian Nat central character Cheilostomata chert Chicago coast coral corneous Cretaceous Cryptostomata Ctenobolbina Cyclostomata Dendrograptus deposits Devonian Dictyonema dissepiments Doctor Gurley dolomite Entoprocta Eocene fauna figure formation forms fossil frond genera genus Geol Geological Society graptolites Gurley's Hamilton Hist Horizon INOCAULIS Iowa Journ Left valve limestone lobe marine Miocene Missouri Museum of Natural Natural History Niagara North Amer occur oceanic Oligocene Ontario operculum Ordovician original description ovicell Paleontological Society Paleozoic paper Pliocene polypary polypide present R. S. Bassler recent reefs region rocks Ruedemann shales showing Silurian species specimens Spencer stem stipe stratigraphic Street surface Tertiary text fig Text figure thick tion Trans Trepostomata U. S. Geological Survey U. S. National Museum Ulrich Univ University Upper W. D. Matthew Washington width York City zone zooecia
Page 144 - Academy took an active and important part in the second annual meeting of the Pacific Division of the American Association for the Advancement of Science, and Affiliated Societies, at Leland Stanford Junior University, April 5 to 7, 1917.
Page 1 - ADVERTISEMENT. The scientific publications of the National Museum consist of two series — the Bulletin and the Proceedings. The Bulletin, publication of which was begun in 1875, is a series of more or less extensive works intended to illustrate the collections of the TJ.
Page 245 - Islands. But in none of the dredgings we made on the Atlantic side of the Isthmus did we come upon such masses of decomposed vegetable matter as we found on this expedition. There was hardly a haul taken which did not supply a large quantity of water-logged wood, and more or less fresh twigs, leaves, seeds, and fruits, in all possible stages of decomposition.
Page 1 - ... and revisions of limited groups. A volume is issued annually, or oftener, for distribution to libraries and scientific establishments, and in view of the importance of the more prompt dissemination of new facts a limited edition of each paper is printed in pamphlet form in advance. RICHARD RATHBUN, Assistant Secretary, Smithsonian Institution, In charge of the United States National Museum.
Page 366 - Ordovician there is scarcely a limestone formation, especially if it has shale alternations, in which they are not abundant. Generally the specimens are calcareous, and in this condition are easily sectioned for study under the microscope by the method mentioned later. Sometimes, however, they are found silicified and the internal structure is, to a certain extent, obliterated so that they can then rarely be successfully sectioned for study. Such specimens, however, frequently preserve the surface...
Page 52 - ... corneous coral, with numerous bifurcating branches; structure fibrous or plumose. The texture of this coral is similar to the Graptolites, a black scaly crust or film being all that remains of the substance. From the specimens examined, it appears to have grown in groups, with rounded or flattened sterns, which are dichotomous above and more or less spreading.
Page 160 - Friday morning, so that the members could attend the symposium on "The Structure and History of Mountains and the Causes of their Development," commencing at that time in the meeting of the Geological Society of America.
Page 265 - Still, allowing for all possible sources of divergence, the essential uniformity in composition of ocean salts is perfectly clear. The mass of the ocean is so great, and the commingling of its waters by winds and currents is so thorough, that the local changes produced by the influx of rivers are exceedingly small. The salinity may range from less than 1 to over 4 per cent, but the saline composition remains practically the same.
Page 22 - Dcndrograpsus. as also the more numerous and more parallel branches. The branches are broader, more drooping, and further separated than in the species of this genus found in the Quebec group. Formation and locality. — This species occurs in the Niagara dolomites and shales at Hamilton, Ontario. Gurley notes the following concerning the species, which is known only from the type, now destroyed : The description of 1884 contains several statements requiring separate notice. The pits indicating the...