A Revision Of The Lower Jurassic Ammonite Genus Eoderoceras Spath And Its Immediate Descendants And Other Relatives
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A Revision Of The Lower Jurassic Ammonite Genus Eoderoceras Spath And Its Immediate Descendants And Other Relatives
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Author : Murray Edmunds
language : en
Publisher:
Release Date : 2009
A Revision Of The Lower Jurassic Ammonite Genus Eoderoceras Spath And Its Immediate Descendants And Other Relatives written by Murray Edmunds and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Ammonoidea categories.
Palaeontographical Society
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Author :
language : en
Publisher:
Release Date : 2009
Palaeontographical Society written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Paleontology categories.
The Tithonian Jurassic Ammonite Fauna And Stratigraphy Of Sierra Catorce San Luis Potosi Mexico
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Author : Harish M. Verma
language : en
Publisher:
Release Date : 1973
The Tithonian Jurassic Ammonite Fauna And Stratigraphy Of Sierra Catorce San Luis Potosi Mexico written by Harish M. Verma and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Ammonoidea categories.
The Jurassic and Cretaceous of Sierra Catorce, which yielded the molluscan fauna for the first large paleontological monograph on Mexico (Castillo and Aguilera, 1895), comprises from the base: the Oxfordian Huizachal Formation and Zuloaga Limestone and the Kimmeridgian to Tithonian La Caja Formation which is overlain by the Valanginian Taraises Formation. The richly fossiliferous La Caja (d"53 m) is divided into two members. The El Pastor Member, below, contains two condensed fossiliferous units, one near the base and one near the top; the El Verde Member, above, has sporadically distributed ammonite fauna. The taxonomic revision is based on approximately 2,000 specimens from 40 localities including 4 almost complete sections. Only 13 of the 25 species formerly described are valid. Twenty-six species are added to the known Tithonian species of Sierra Catorce. Five species and one subspecies are new: Virgatosphinctes sanchezi, Kossmatia purisima, Substeueroceras catorcense, Corongoceras cordobai, Durangites alencasteri, and Substeueroceras koeneni (Steuer) tabulatum. Of the total of 52 species described here, 20-21 are endemic, 8-9 are in common with Argentina, 5 in common with Europe and 4 in common with the Indo-Malgache region. Many species are dimorphic. The ammonite fauna is classified into 6 families, 20 genera and 52 species which, with the exception of one Kimmeridgian genus comprising 3 species, are of Tithonian age. Eleven Tithonian genera are recorded for the first time from Sierra Catorce: Pseudolissoceras Spath, "Paraglochiceras" Collignon, Pseudoinvoluticeras Spath, Virgatosphinctes Uhlig, Simoceras Zittel, Physodoceras Hyatt, Substeueroceras Spath, Andiveras Krantz, Corongoceras Spath, Micracanthoceras Spath and Durangites Burckhardt. On the basis of abundant new material, the genera Substeueroceras, Kossmatia and Durangites are discussed in detail. "Parodontoceras" Spath is a synonym of Substeuerocedras; Kossmatia is transferred from the family Ataxioceratidae (cf. Treatise) to the Berriasellidae; Durangites may be dimorphic. Four major ammonite assemblages are recognized: (1) the small Kimmeridgian Idoceras assemblage near the base of the El Pastor Member, (2) the diverse late Lower ("Middle") Tithonian Virgatosphinctinae assemblage in the upper El Pastor Member, (3) the early Upper Tithonian Kossmatia-Durangites-Corongoceras assemblage in the lower El Verde Member, and (3) the late Upper Tithonian Substeueroceras-Berriasella assemblage in the upper El Verde Member. There is closet affinity at generic and specific levels with Tithonian faunas especially of Argentina: the condensed Virgatosphinctinae Beds are correlated with the two Argentine zones of Virgatosphintes mendozanus and Pswudolissoceras zitteli; the Kossmatia-Durangites-Corongoceras assemblage is in part equivalent to the Argentine Zone of Corongoceras alternans; and the Substeuroceras-Berriasella assemblage belongs to the Substeueroceras koeneni Zone. Mediterranean affinities appear to be secondary. Boreal elements are missing. On account of high clastic content, the abundance of benthos, and the impoverishment of compressed involute forms among the ammonites, the La Caja Formation appears to have been deposited in shallow, moderately off-shore waters.
Hettangian Sinemurian Early Jurassic Ammonites Of New Zealand
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Author : Graeme R. Stevens
language : en
Publisher:
Release Date : 2004
Hettangian Sinemurian Early Jurassic Ammonites Of New Zealand written by Graeme R. Stevens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Nature categories.
"... This bulletin provides the first comprehensive scientific description of Early Jurassic ammonites (200-189 million years) of the Hokonui Hills and also includes those of the Catlins coast (Otago) and Marokopa and Kawhia of the Waikato coast."--COVER.
Toarcian Early Jurassic Ammonoids From Western North America
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Author : G. K. Jakobs
language : en
Publisher:
Release Date : 1997
Toarcian Early Jurassic Ammonoids From Western North America written by G. K. Jakobs and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Ammonoidea categories.
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.
The Late Jurassic Ammonite Fauna Of New Zealand
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Author : Graeme Roy Stevens
language : en
Publisher:
Release Date : 1997
The Late Jurassic Ammonite Fauna Of New Zealand written by Graeme Roy Stevens and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Science categories.
Pliensbachian Lower Jurassic Ammonites Of The Queen Charlotte Islands British Columbia
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Author : Paul Lawrence Smith
language : en
Publisher:
Release Date : 1996
Pliensbachian Lower Jurassic Ammonites Of The Queen Charlotte Islands British Columbia written by Paul Lawrence Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Ammonoidea categories.
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.
The Jurassic Ammonite Fauna Of Cuba
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Author : Marjorie O'Connell
language : en
Publisher:
Release Date : 1920
The Jurassic Ammonite Fauna Of Cuba written by Marjorie O'Connell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1920 with Ammonoidea categories.
British Lower Jurassic Stratigraphy
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Author : M. J. Simms
language : en
Publisher:
Release Date : 2004
British Lower Jurassic Stratigraphy written by M. J. Simms and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Science categories.
Describes 45 sites, from small quarries to magnificent coastal cliffs, which represent the entire British outcrop, from North-East Scotland to South Wales and South-West England. This book demonstrates the diversity of Lower Jurassic stratigraphy and facies in Britain. It is of considerable importance within a British and Western European context.
Type Ammonites
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Author : S.S. Buckman
language : en
Publisher:
Release Date : 1922
Type Ammonites written by S.S. Buckman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1922 with categories.