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Author : Andrew Caruthers,Paul Smith,Darren Gröcke,Benjamin Gill,Theodore Them II,João P. Trabucho Alexandre
Publisher : Unknown
Page : 128 pages
File Size : 48,8 Mb
Release : 2018-02-28
Category : Electronic
ISBN : 0877105227
Author : G. K. Jakobs
Publisher : Unknown
Page : 148 pages
File Size : 42,8 Mb
Release : 1997
Category : Ammonoidea
ISBN : UIUC:30112002138912
Toarcian (Early Jurassic) strata in the Queen Charlotte Islands have yielded a well-preserved and diverse ammonite fauna that provides a framework for a regional ammonite zonation for western North America described in this report. Other localities, particularly in southern Alaska and north- western British Columbia, have provided additional material contributing to the development of this zonation, which is of prime importance in determining the age of sedimentary strata and the relative timing of tectonic events. The report describes the biostratigraphy of the five western North American Toarcian ammonite zones, the occurrence and stratigraphy of Toarcian fossil occurrences in the western Cordillera, Pacific Northwest, and Queen Charlotte Islands, and biostratigraphic correlations with other areas including Europe. Systematic paleontological descriptions are provided of fossil ammonoids. The appendix includes fossil specimen locality data.
Author : Paul Lawrence Smith,H. W. Tipper
Publisher : Unknown
Page : 122 pages
File Size : 52,8 Mb
Release : 1996
Category : Ammonoidea
ISBN : 0877104395
The lower Maude and upper Kunga groups in the central Queen Charlotte Islands provide the most complete and fossiliferous Pliensbachian sequences in North America. Outcrops on Maude Island and at Whiteaves Bay serve as either type or reference sections for the Imlayi, Whiteavesi, Freboldi, Kunae, and Carlottense zones of the standard North American zonation. The Sandilands Formation of the Kunga Group is mostly pre-Pliensbachian in age but exposures on Kunga Island are as young as Whiteavesi Zone. The Sandilands Formation and the succeeding Ghost Creek Formation of the Maude Group were deposited in fairly deep, euxinic water subjected to diminishing pyroclastic and volcaniclastic input, the latter by turbidity currents. Shallowing culminated in the deposition of the coarser sediments of the Fannin Formation which were laid down in higher energy, well oxygenated waters. Most of the Ghost Creek Formation is assignable to the Imlayi Zone with its upper 10 m or so as young as the Whiteavesi Zone; at one level in the Whiteavesi Bay section, it is as young as the Freboldi Zone. The Fannin Formation ranges in age form the Whtieavesi to the Carlottense zones and locally into the Toarcian. This report is the first comprehensive, stratigraphically controlled study of the Pliensbachian ammonoids of the Queen Charlotte Islands. Seven hundred and fourteen localities have yielded at least 1600 specimens assignable to approximately 85 species representing 32 genera of sub-genera and 11 families of ammonoids. Charlotticeras is established as a new subgenus of Fanninoceras and Pacificeras (Repin, 1970) is recognized as a subgenus of Lioceratoides. The following new species are established (in alphabetical order): Acanthopleuroceras thomsoni, Fanninoceras (Charlotticeras) carteri, F. (C.) maudense, Lioceratoides (Leoceratoides) involutum, Oistoceras compressum, Oregonites? dawsoni, Protogrammoceras (Protogrammoceras) skidegatense, and Teynesocoeloceras grahami.
Author : Gerta Keller,Andrew C. Kerr
Publisher : Geological Society of America
Page : 468 pages
File Size : 50,8 Mb
Release : 2014-09-16
Category : Science
ISBN : 9780813725055
"Comprises articles stemming from the March 2013 international conference at London's Natural History Museum. Researchers across geological, geophysical, and biological disciplines present key results from research concerning the causes of mass extinction events"--
Author : Anonim
Publisher : Unknown
Page : 75 pages
File Size : 53,6 Mb
Release : 1986
Category : Paleontology
ISBN : 0877104069
Author : G. Einsele,A. Seilacher
Publisher : Springer Science & Business Media
Page : 543 pages
File Size : 53,8 Mb
Release : 2012-12-06
Category : Science
ISBN : 9783642758294
Author : Joel S. Watkins,Charles L. Drake,American Association of Petroleum Geologists
Publisher : Unknown
Page : 844 pages
File Size : 43,7 Mb
Release : 1983
Category : Science
ISBN : UCSD:31822031221666
Author : V. Courtillot,Vincent Courtillot
Publisher : Cambridge University Press
Page : 192 pages
File Size : 51,8 Mb
Release : 2002-03-07
Category : Nature
ISBN : 0521891183
Mass extinction and cataclysmic volcanic activity: will fascinate everyone interested in the history of life and death on our planet.
Author : Waldemar Lindgren,Kerby Jackson
Publisher : CreateSpace
Page : 250 pages
File Size : 48,9 Mb
Release : 2014-11-18
Category : Electronic
ISBN : 150328557X
Mining historian Kerby Jackson introduces us to a classic mining work in this important re-issue of the Us Department of Interior publication "Gold Belt of the Blue Mountains of Oregon." Originally published in 1901, this important publication on Oregon Mining has not been available for over a century. Included in this volume are rare insights into the gold deposits of the Blue Mountains of North East Oregon, including the history of their early discovery and early production. Extensive details are offered on this important mining area's mineralogy and economic geology, as well as insights into nearby gold placers, silver deposits and copper deposits. Featured are the Elkhorn and Rock Creek mining districts, the Pocahontas district, Auburn and Minersville districts, Sumpter and Cracker Creek, Cable Cove, the Camp Carson district, Granite, Alamo, Greenhorn, Robinsonville, the Upper Burnt River Valley and Bonanza districts, Susanville, Quartzburg, Canyon Creek, Virtue, the Copper Butte district, the North Powder River, Sparta, Eagle Creek, Cornucopia, Pine Creek, Lower Powder River, the Upper Snake River Canyon, Rye Valley, Lower Burnt River Valley, Mormon Basin, the Malheur and Clarks Creek districts, Sutton Creek and others. Of particular interest are important details on numerous gold mines and prospects in these mining districts, including their locations, histories, geology and other important information, as well as information on silver, copper and fire opal deposits. Note: This edition is a perfect facsimile of the original edition and is not set in a modern typeface. As such, some type characters and images might suffer from slight imperfections or minor shadows in the page background.
Author : A. Hallam,P. B. Wignall
Publisher : Oxford University Press, UK
Page : 334 pages
File Size : 52,7 Mb
Release : 1997-09-11
Category : Electronic
ISBN : 9780191588396
The first book to review all the evidence concerning both the dinosaur extinctions and all the other major extinctions - of plant, animal, terrestrial, and marine life - in the history of life. All the extinction mechanisms are critically assessed, including meteorite impact, anoxia, and volcanism. - ;Why do mass extinctions occur? The demise of the dinosaurs has been discussed exhaustively, but has never been out into the context of other extinction events. This is the first systematic review of the mass extinctions of all organisms, plant and animal, terrestrial and marine, that have occurred in the history of life. This includes the major crisis 250 million years ago which nearly wiped out all life on Earth. By examining current paleontological, geological, and sedimentological evidence of environmental changes, the cases for explanations based on climate change, marine regressions, asteroid or comet impact, anoxia, and volcanic eruptions are all critically evaluated. -
Author : William Hung Kan Lee
Publisher : Unknown
Page : 0 pages
File Size : 41,6 Mb
Release : 1965
Category : Earth temperature
ISBN : OCLC:1229296851
Author : D. I. MacKinnon,Daphne E. Lee,J. D. Campbell
Publisher : CRC Press
Page : 472 pages
File Size : 53,5 Mb
Release : 1991-06-01
Category : Science
ISBN : 9061911605
Author : Michael J. Benton,Mikhail A. Shishkin,David M. Unwin,Evgenii N. Kurochkin
Publisher : Cambridge University Press
Page : 744 pages
File Size : 48,6 Mb
Release : 2003-12-04
Category : Nature
ISBN : 052154582X
Unique reference volume covering major vertebrate fossil finds in former Soviet Union never before described in English.
Author : Douglas H. Erwin
Publisher : Columbia University Press
Page : 342 pages
File Size : 55,7 Mb
Release : 1993
Category : Science
ISBN : 9780231074667
The culmination of more than fifty years of research by the foremost living expert on plant classification, Diversity and Classification of Flowering Plants is an important contribution to the field of plant taxonomy. In the last decade, the system of classifying plants has been thoroughly revised. Instead of describing every individual family, Takhtajan includes descriptions in keys to families, which he calls "descriptive keys." The advantage of descriptive keys is that they give both the characteristic features of the families and their differences. The delimitation of families and orders drastically differs from the one accepted by the Englerian school and from the one accepted in Arthur Cronquist's system. Takhtajan favors the smaller, more natural families and orders, which are more coherent and better-defined, where characters are easily grasped, and which are more suitable for information retrieval and phylogenetic studies, including cladistic analysis (because it reduces polymorphic codings).
Author : Traverse A.,Ames H. T.,Spackman W.
Publisher : Alexander Doweld
Page : 251 pages
File Size : 49,5 Mb
Release : 2024-07-03
Category : Science
ISBN : 8210379456XXX