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Author: Marjorie O'Connell
Publisher:
ISBN:
Category : Ammonoidea
Languages : en
Pages : 908
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Author: Marjorie O'Connell
Publisher:
ISBN:
Category : Ammonoidea
Languages : en
Pages : 908
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Book Description
Author: Harish M. Verma
Publisher:
ISBN:
Category : Ammonoidea
Languages : en
Pages : 282
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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.
Author: Ralph Willard Imlay
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 144
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Paleogeographic changes in the United States during Jurassic time are revealed by the distribution, succession, and differentiation of molluscan faunas; by gross stratigraphic changes; by the position, extent, and duration of unconformities; and by comparisons with Jurassic data elsewhere in North America.
Author: Manuel Enrique Pardo Echarte
Publisher: Springer Nature
ISBN: 3030677982
Category : Science
Languages : en
Pages : 308
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Book Description
The evolution of geological cartography in Cuba in its more than 135 years of history has been possible through the consultation of numerous archival reports, publications, maps and personal interviews with different authors and geologists of vast experience. A brief critical analysis is made of the increase in the degree of geological knowledge of the country since the elaboration of the Geological Sketch of the Cuban Island at a scale of 1: 2 000 000 (Fernández de Castro, 1883), first of Cuba and of Ibero-America, until the most recent Digital Geological Map of Cuba at scale 1: 100 000 (Pérez Aragón, 2016). Cuba and its surroundings are a geological mosaic in the southeast corner of the North American plate with rocks from many different origins, from Proterozoic to Quaternary, extended along the southern border of the plate. From the Eocene, this belt has been dissected by several great faults, related to the development of some great oceanic depressions (Cayman trough and Yucatan basin). The fossil record of Cuba, which covers approximately the last 200 million years of life on Earth, is rich in very varied fossils, witnessing a wide diversity of organisms, both animals and plants, that inhabited the Antillean and Caribbean region; and that constitute the inheritance of the biological diversity that the current Cuban archipelago exhibits. As a result of the preparation of the Cuban Metallogenic Map at scale 1: 250 000, forty-one models and eight sub-models of metallic mineral deposits were identified. These models, of descriptive–genetic type, together with the analysis of their spatial distribution and their relationship with geology, allowed the identification and mapping of ten mineral systems, linked to the geodynamic environments present in the Cuban territory. Cuba has large deposits of limestone, loam, dolomite, kaolin, gypsum and anhydrite, rock salt, marbles, sands and clays of different types, zeolites, peat, therapeutic peloids and many more. There are manifestations of decorative and precious rocks such as jasper, jadeite, different varieties of quartz and even xylopals. A compilation of geochemical data of oceanic basalt samples from previous works, together with data of analyzed samples during this study in order to discuss geochemical criteria based on immobile element (proxies for fractionation indices, alkalinity, mantle flow and subduction addition), provide a comprehensive ophiolite classification according to their tectonic setting. This book addresses different facets of the geological knowledge of Cuba: history of its cartography, marine geology, fossil record, stratigraphy, tectonics, classification of its ophiolites, quaternary deposits, metallogeny and minerageny.
Author: Geological Society of America
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 928
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Book Description
Vols. 1-44 include Proceedings of the annual meeting, 1889-1933, later published separately.
Author: Ralph Willard Imlay
Publisher:
ISBN:
Category : Ammonoidea
Languages : en
Pages : 52
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Book Description
Ammonites furnish correlations with Jurassic rocks elsewhere on the Pacific coast and with the standard European stages.
Author: Marjorie O'Connell
Publisher:
ISBN:
Category : Ochetoceras
Languages : en
Pages : 40
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 310
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Author: Dean Eddy Winchester
Publisher:
ISBN:
Category : Oil-shales
Languages : en
Pages : 758
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Author: Marilyn Bailey Ogilvie
Publisher: Taylor & Francis
ISBN: 9780415920407
Category : Biography & Autobiography
Languages : en
Pages : 812
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Book Description
Volume 2 of 2.
