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  • 1
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 2010
    In:  American Antiquity Vol. 75, No. 4 ( 2010-10), p. 907-933
    In: American Antiquity, Cambridge University Press (CUP), Vol. 75, No. 4 ( 2010-10), p. 907-933
    Abstract: Los cazadores Clovis de los Great Plains de Norte América se conocen por su habilidad de cazar mamuts y alimentarse de restos de mamuts. Se conoce menos de sus estrategias de caza para otros animales grandes, como caballos, camellos, y bisontes, aunque se han encontrado restos de estos animales en varios campamentos Clovis. Investigaciones recientes del sitio, Jake Bluff, en el sur de las Great Plains han identificado una matanza Clovis de bisontes en un arroyo. Este uso aparente de una trampa de estilo arroyo para cazar bisontes provee la oportunidad de estudiar estrategias Clovis de caza que llegaron a usarse extensamente durante tiempos más tardíos paleo-indios. La trampa de estilo arroyo para bisontes generalmente se atribuye a Folsom y otros grupos más tardíos, y sin embargo, el sitio Jake Bluff rindió una asociación de puntas de proyectil de estilo Clovis con los restos de 22 Bison antiquus en el fondo de un arroyo corto. La fecha tardía de 12,838 AP sugiere que el sitio abarca el intervalo entre los cazadores Clovis de mamuts y los cazadores Folsom de bisontes, indicando que los cazadores Clovis desarrollaron la trampa estilo arroyo para bisontes para capturar múltiples bisontes al mismo tiempo, y así, un abastecimiento de carne cuando el número de mamuts disminuía durante la transición de Pleistoceno al Holoceno.
    Type of Medium: Online Resource
    ISSN: 0002-7316 , 2325-5064
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2010
    detail.hit.zdb_id: 2050689-2
    SSG: 7,26
    SSG: 6,14
    SSG: 6,33
    SSG: 6,11
    Location Call Number Limitation Availability
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  • 2
    In: GEOPHYSICS, Society of Exploration Geophysicists, Vol. 77, No. 2 ( 2012-03), p. B87-B96
    Abstract: Depth imaging in ultrashallow ([Formula: see text]) environments presents twofold challenge: (1) c oda available for depth migration is very limited; and (2) conventional time processing with limited coda generally fails to estimate reliable velocity models for depth migration. We studied the combining of first-arrival traveltime inversion and prestack depth migration (PSDM) for depth imaging of ultrashallow paleochannel stratigraphy associated with the Bull Creek drainage system, Oklahoma. Restricted by a limited number of geophones (24) we acquired data for inversion and migration through two coincident profiles. The first profile for inversion has a wider survey-aperture (115-m maximum shot-receiver spacing) and consequently sparse CMP spacing (2.5 m), whereas the second profile for PSDM has denser CMP spacing (1 m) and consequently a narrower survey aperture (46-m maximum shot-receiver spacing). We also found that the velocity model from traveltime inversion of the wider-aperture data set is more preferable for depth-migration than the velocity model from time processing of the denser data set. The preferred depth image showed three episodes of incision whose chronological order is resolved through radio-carbon dating of terrace sediments. Results suggested that even with limited geophones, depth imaging of ultrashallow targets can be achieved by combining first-arrival traveltime inversion and PSDM through coincident wide- and narrow-aperture acquisitions.
    Type of Medium: Online Resource
    ISSN: 0016-8033 , 1942-2156
    RVK:
    Language: English
    Publisher: Society of Exploration Geophysicists
    Publication Date: 2012
    detail.hit.zdb_id: 2033021-2
    detail.hit.zdb_id: 2184-2
    SSG: 16,13
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Informa UK Limited ; 2012
    In:  Plains Anthropologist Vol. 57, No. 221 ( 2012-02), p. 53-62
    In: Plains Anthropologist, Informa UK Limited, Vol. 57, No. 221 ( 2012-02), p. 53-62
    Type of Medium: Online Resource
    ISSN: 0032-0447 , 2052-546X
    Language: English
    Publisher: Informa UK Limited
    Publication Date: 2012
    detail.hit.zdb_id: 2066903-3
    SSG: 6,33
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  • 4
    Online Resource
    Online Resource
    Proceedings of the National Academy of Sciences ; 2014
    In:  Proceedings of the National Academy of Sciences Vol. 111, No. 5 ( 2014-02-04), p. 1726-1731
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 111, No. 5 ( 2014-02-04), p. 1726-1731
    Abstract: High levels of nanodiamonds (nds) have been used to support the transformative hypothesis that an extraterrestrial (ET) event (comet explosion) triggered Younger Dryas changes in temperature, flora and fauna assemblages, and human adaptations [Firestone RB, et al. (2007) Proc Natl Acad Sci USA 104(41):16016–16021]. We evaluate this hypothesis by establishing the distribution of nds within the Bull Creek drainage of the Beaver River basin in the Oklahoma panhandle. The earlier report of an abundance spike of nds in the Bull Creek I Younger Dryas boundary soil is confirmed, although no pure cubic diamonds were identified. The lack of hexagonal nds suggests Bull Creek I is not near any impact site. Potential hexagonal nds at Bull Creek were found to be more consistent with graphene/graphane. An additional nd spike is found in deposits of late Holocene through the modern age, indicating nds are not unique to the Younger Dryas boundary. Nd distributions do not correlate with depositional environment, pedogenesis, climate perturbations, periods of surface stability, or cultural activity.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    RVK:
    RVK:
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2014
    detail.hit.zdb_id: 209104-5
    detail.hit.zdb_id: 1461794-8
    SSG: 11
    SSG: 12
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