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  • 1
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    Pleistocene magnetochronology of early hominin sites at Ceprano and Fontana Ranuccio, Italy (2009)
    Elsevier
    Details
    Publikationsdatum: 2017-04-04
    Beschreibung: Paleomagnetic analyses were conducted on two cores drilled at Ceprano in central Italy where an incomplete hominin cranium was discovered in1994, as well as on two additional cores from the nearby site of Fontana Ranuccio that yielded hominin remains associated with an Acheulean industry. No evidence for the 0.78 Ma Brunhes–Matuyama boundary was found at Ceprano down to 45 m below the level that yielded the hominin cranium. The Ceprano lithostratigraphy and the paleomagnetic age constraints are broadly consistent with the stratigraphy of the Liri lacustrine sequence of the Latina Valley, constrained by published K–Ar ages between ~0.6 and ~0.35Ma, and according to an age model with magnetic susceptibility supported by pollen facies data, suggest that the level that yielded the hominin cranium has an age of ~0.45 (+0.05, −0.10) Ma. Evidence for the Brunhes–Matuyama boundary was found at Fontana Ranuccio about 40 m below the hominin level, consistent with a K–Ar age of ~0.46 Ma reported for this level. Hence the Ceprano and Fontana Ranuccio hominin occurrences may be of very similar mid-Brunhes age.
    Beschreibung: Published
    Beschreibung: 255-268
    Beschreibung: 3.2. Tettonica attiva
    Beschreibung: JCR Journal
    Beschreibung: reserved
    Schlagwort(e): Pleistocene ; Ceprano ; Fontana Ranuccio ; magnetostratigraphy ; hominins ; Italy ; 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 2
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    Human migration into Europe during the late Early Pleistocene climate transition (2010)
    Elsevier
    Details
    Publikationsdatum: 2017-04-04
    Beschreibung: A critical assessment of the available magnetostratigraphic and/or radiometric age constraints on key sites bearing hominin remains and/or lithic industries from southern Europe (Italy, France, Spain) leads us to propose that the main window of early hominin presence in southern Europe is broadly comprised between the Jaramillo subchron and the Brunhes–Matuyama boundary (i.e., subchron C1r.1r, 0.99–0.78 Ma). Within the dating uncertainties, this ~200 ky time window broadly coincides with the late Early Pleistocene global climate transition that contains marine isotope stage (MIS) 22 (~0.87Ma), the first prominent cold stage of the Pleistocene. We suggest that aridification in North Africa and Eastern Europe, particularly harsh during MIS22 times, triggered migration pulses of large herbivores, particularly elephants, from these regions into southern European refugia, and that hominins migrated with them. Finally, we speculate on common pathways of late Early Pleistocene dispersal of elephants and hominins from their home in savannah Africa to southern Europe, elephant and hominin buen retiro. In particular, we stress the importance of the Po Valley of northern Italy that became largely and permanently exposed only since MIS22, thus allowing possibly for the first time in the Pleistocene viable new migration routes for large mammals and hominins across northern Italy to southern France and Spain in the west.
    Beschreibung: Published
    Beschreibung: 79-93
    Beschreibung: 3.2. Tettonica attiva
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Pleistocene ; Magnetostratigraphy ; Hominins ; Migration ; Europe ; Galerian ; Jaramillo ; Brunhes-Matuyama ; 04. Solid Earth::04.04. Geology::04.04.02. Geochronology ; 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport ; 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy ; 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 3
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    First dated human occupation of Italy at ~0.85Ma during the late Early Pleistocene climate transition (2012)
    Elsevier Science Limited
    Details
    Publikationsdatum: 2022-06-14
    Beschreibung: A candidate for the oldest human occupation site in Italy is Monte Poggiolo where the lithic tool-bearing levels are currently dated to ~ 1 Ma based on electron spin resonance (ESR). The low analytical precision of ± 30% at 2σ makes it unclear whether the date actually conflicts with a recent reassessment of age constraints on key hominin sites from Italy, France, and Spain pointing to a uniformly young timing for the earliest habitation of southern Europe during the late Early Pleistocene climate transition within reverse magnetic polarity subchron C1r.1r (0.988–0.781 Ma). Our new magnetostratigraphic and biostratigraphic results show a sequence of stable normal and reverse polarities in a regional lithostratigraphic context that indicate the Monte Poggiolo tool-bearing site post-dates the Jaramillo normal polarity subchron, most probably occurring at ~ 0.85 Ma immediately after the pronounced cooling that culminated with marine isotope stage 22 when the associated regression may have opened new migration routes through the Po Valley for large mammals and hominins.
    Beschreibung: Published
    Beschreibung: 241–252
    Beschreibung: JCR Journal
    Beschreibung: restricted
    Schlagwort(e): Italy; Monte Poggiolo; hominins; magnetostratigraphy; nannofossil biostratigraphy; Pleistocene climate ; 05. General::05.03. Educational, History of Science, Public Issues::05.03.99. General or miscellaneous
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
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  • 4
    Digitale Medien
    Digitale Medien
    Palaeomagnetism of Red Beds of the Late Devonian Worange Point Formation, Se Australia (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 104 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Geologie und Paläontologie
    Notizen: Gently folded strata of the Late Devonian Merrimbula Group along the south coast of New South Wales are similar to numerous deposits of Late Devonian to Early Carboniferous, subaerial to shallow marine, quartzose sandstone that are known as the Lambie Facies of SE Australia. Because the Lambie sands overlap the early Palaeozoic tectonic elements of the Lachlan Fold Belt, large displacement since the Late Devonian of any Lachlan terranes, with respect to interior Australia, is precluded. We collected oriented core samples from 37 sites primarily in reddish, quartzose litharenites of the Worange Point Formation. the remanent magnetization is carried by haematite. Incremental thermal demagnetization reveals a dominant, well-defined, steep-upward-north component of magnetization that post-dates the mid-Carboniferous folding. the south pole position (146.4°E, 68.6°S, A95 3.1°) derived from the overprinted specimens is close to both the Late Carboniferous and mid-Cretaceous reference poles as well as the spin axis of today. the overprint is attributed to both viscous partial thermoremanent and chemical remanent magnetization (VPTRM and CRM). Its exclusively normal polarity is consistent with a mid-Cretaceous acquisition, perhaps related to the rifting of the SE Australian margin.A characteristic component of magnetization is isolated between -660° and -680°C in -30 per cent of the samples. Although a regional fold test of the overall result is inconclusive because the directions of characteristic magnetization are generally close to the axes of folding, two sets of samples from opposite limbs of a local syncline pass a fold test at 90 per cent confidence, indicating a pre-folding origin of the remanence. the presence of both polarities in thin horizons, some of which are palaeosols, and diagenetic haematite associated with incipient cleavage formed in an early stage of deformation before folding, indicates that the acquisition of remanent magnetization occurred over a protracted period. an analysis that combines great circle demagnetization paths and set points, facilitates the incorporation of more data but gives a biassed result. Although normal and reverse polarity subsets are roughly antipodal, residual post-folding components cause the normal subset to fail a fold test. A south pole position (19.7°E, 70.8°8, A95 7.1°) is derived from the specimens with characteristic component of reverse polarity in which the isolation of a characteristic component is clear.The pole position is close to that of a previous palaeomagnetic study from a widely separated occurrence of Lambie Facies sediments; both results are applicable not only to the Lachlan Fold belt, but also to the rest of Australia, and Gondwana as a whole. the position of the two poles derived from the Lambie Facies overlap assemblage in the Lachlan Fold Belt supports the interpretation that the progression ***
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb02503.x
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  • 5
    Digitale Medien
    Digitale Medien
    Oxygen isotope calibration of the onset of ice-rafting and history of glaciation in the North Atlantic region (1984)
    [s.l.] : Nature Publishing Group
    Nature 307 (1984), S. 620-623 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Despite the concentration of members of the deep-sea drilling community around the North Atlantic, surprisingly few Deep Sea Drilling Project sites have been drilled that are suitable for even a cursory study of North Atlantic palaeoenvironments. Until recently the best sites in which to study the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/307620a0
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  • 6
    Digitale Medien
    Digitale Medien
    Apparent correlation of palaeomagnetic intensity and climatic records in deep-sea sediments (1982)
    [s.l.] : Nature Publishing Group
    Nature 299 (1982), S. 538-539 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] A fundamental relationship between geomagnetic field behaviour and climate change has been suggested, largely on the basis of an apparent correlation in geomagnetic and climatic indices over time scales ranging from historical observatory records of geomagnetic intensity and air temperature3 to the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/299538a0
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  • 7
    Digitale Medien
    Digitale Medien
    Palaeomagnetic field intensity variation recorded in a Brunhes epoch deep-sea sediment core (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 156-159 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Progressive alternating field (AF) demagnetisation of the NRM in 12 pilot samples showed consistent directions of magnetisation, to within 10 of the initial value, with demagnetisation up to 400 Oe. The mean remanent inclination after 150-Oe AF is 51.2, close to the expected dipole inclination ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/266156a0
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  • 8
    Digitale Medien
    Digitale Medien
    Evidence for an increase in cosmogenic 10 Be during a geomagnetic reversal (1985)
    [s.l.] : Nature Publishing Group
    Nature 315 (1985), S. 315-317 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] In previous work, we found no significant evidence for increased 10Be (half-life 1.5 Myr) at a reversal boundary6. Among the explanations we gave for this negative result was that the sedimentation rate of the core studied (1.13 cmkyr"1) was not high enough to retain a significant signal. We have ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/315315a0
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  • 9
    Digitale Medien
    Digitale Medien
    Geomagnetic excursions and climate change (reply) (1983)
    [s.l.] : Nature Publishing Group
    Nature 302 (1983), S. 455-456 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] KENT REPLIES-Rampino is correct in stating that, unlike NRM intensity fluctuations observed in some cores1, anomalous NRM directions interpreted as geomagnetic excursions are not readily explained by changes in lithology and magnetic mineral content. The question of excursions, particularly their ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/302455b0
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  • 10
    Digitale Medien
    Digitale Medien
    Earth science: Statistical structure of geomagnetic reversals (1985)
    [s.l.] : Nature Publishing Group
    Nature 313 (1985), S. 15-15 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] REVERSALS of the Earth's magnetic field have not occurred at a constant average rate over the past 170 Myr1,2. Shifts in the mean reversal rate at various times appear to be separated by periods of tens of millions of years in which the average rate of reversals remains nearly constant. Conclusions ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/313015a0
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