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1. Mid-Holocene bottleneck for central European dry grasslands: Did steppe survive the forest... 2015

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwpV3fa9swED7WlsFe2v2CZeuCBmMwmIktR7JcSkvjNssGhbJ2bOwlSLK8hBInS5tB-3_0_92dbLfeYHvZi43ONrK50-mT7vwdwOsw1dpyjhoQhQj61qjAaG0CkaeF0WERudT8vplTZRPSvzC1fhu36H11Pre0Td6LpER_mwrF9xc_AiocRQHWuorGGmxwnPtxbG4cDD5mw9tQglSeNNXvd0nVjlX2SEaiCFGE5FT3oz033QHOVo6Xn3aGWzBrXthnm1CNg3bafc9THXp-i4bW8b8-7iFs1viUHVQG9QjuufIx3H_v6_9ePYGb42kejLBh0UcyKkOGs5az5wyxL6sTPVmzw8_y5RX7vkR47n8o3mGH05yhVS0Wjl2s0Ef9dAzxJz2L78nm6L1mqxmblqykaJJblmx3sjeYE6eB3u1N9t5RO7t2dsI-uYqgm8T7T-Hz8OgsGwV1ZYdAx1JcBjrBr5VFaHWiE4RYQhun-4ZbrgtsxSmunKMktDmujnTirEpzjisvE1thKG06fgZMxS7NTSGVdbIvnEw1IlGlNTdOyNSoDrxtlDleVMwd46ghN_9D8R3YbpQyrsfwxfhOIx14dXsZRx-FVHTp5iu6R4V9il1HHXhDVtJ6_C99Pf93Xy_gAWIyUSUHbcP65XLlXsI6WVYX1pKvg25t4HQ-y05OUXp0OOoSwekXlI2yD8Nv2DrmJ3RMTn8BAQoKfQ

   Pokorny, Petr; Chytry, Milan; Jurickova, Lucie; Sadlo, Jiri; Novak, Jan...

   Holocene (Sevenoaks), Vol. 25, Issue 4, pp. 716 - 726.

   Revisiting the classical Gradmann’s ‘steppe theory’ for central Europe, we examine whether the early Holocene steppe habitats survived the critical period of maximum Holocene afforestation: the mid... Read more

   Revisiting the classical Gradmann’s ‘steppe theory’ for central Europe, we examine whether the early Holocene steppe habitats survived the critical period of maximum Holocene afforestation: the mid-Holocene bottleneck. Despite the undisputable fact that afforestation was a dominant ecological factor in this period, our parallel analyses of pollen and molluscs from sedimentary sequences discovered in the dry lowland area of northern Bohemia, Czech Republic (Zahájí and Suchý potok sites, lower Ohře area) provide strong evidence for uninterrupted local occurrence of steppe grasslands throughout the Holocene. At the onset of the Neolithic agriculture, this area was covered by forest-steppe. Analogously to the present forest-steppe landscapes of eastern Europe and south-western Siberia, dry areas of northern Bohemia were dominated by open-canopy pine–birch forests that enabled continuous survival of many light-demanding plant species from the late Glacial and early Holocene to the Neolithic. Later on, anthropogenic deforestation and livestock grazing created a semi-natural steppe. Our data suggest that this secondary steppe can be viewed as a direct continuation of the late Pleistocene and early Holocene natural steppe rather than a purely cultural steppe developed only after deforestation of a continuously forested mid-Holocene landscape by humans. At the same time, we provide evidence supporting Gradmann’s ‘steppe theory’, assuming that in central Europe, Neolithic farming started in those areas that were not completely forested but contained remnants of natural steppes. This finding has important implications for the interpretation of present biodiversity patterns in central Europe. Read less

   Journal Article  |  Full Text Online

2. Late Glacial and Holocene sequences in rockshelters and adjacent wetlands of Northern Bohemia,... 2018

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwnV1LS8QwEA6iCF58g29y8GjZvpImsizo4rqieBA9eSiTNqU-6Kq7Ivq7_IFOklZXUUEvgbRJSZkhM5l88w0h274EyMIQJcAK5sWZEp4CUB7LZaHALwIt1edgDmk1uTBfr_AtFOv-EU_JBvgYOJpNk7A3haaH42lrau_ouH_6gergro6tAcpx9J2bbLkfvvO9NXJQSGthenPkslmbBZaYcgbjCPuWZTW0VBYNg-Mf_mOezNaOJ91zmrJAJnS1SKYPbWHf5yXyeoJOJz28BRNCp1DltI9vMtwJ6Tvaml5VFO3dzbDU5o59aIdBfg0G4Umf9MjmDdNBQe1tkH6oaLvs7A8MJwG0W2Vnx_S7Lzor6Zl2BNvm8S7tmhohDpVnpo9l39WLsZROutmoqQstDZfJRe_gvNv36ooOHkQsGmEbS5VEic98FUhR5BK4ilkeQZj5QZGLgCUSVQTHxIkf6DjBVmQiKHSoA4iiFUJFpGWuCi4yzWOmuQT0QAVAqDTjUolV4jUiTe8cY0faQNmuUyeC1Igg9VmKIlglSSP3tPY6nDeRogB_nbn275nrZAZ7BkXohXyDTI4eHvUmmTQ6tVVr9Bssj_oM

   Svoboda, Jiří; Pokorný, Petr; Horáček, Ivan; Sázelová, Sandra...

   Quaternary International, Vol. 465, pp. 234 - 250.

   This paper combines complex archaeological records from excavations of sandstone rockshelters with paleobotanical investigations in the adjacent wetlands of Northern Bohemia, Czech Republic. Severa... Read more

   This paper combines complex archaeological records from excavations of sandstone rockshelters with paleobotanical investigations in the adjacent wetlands of Northern Bohemia, Czech Republic. Several pollen diagramms from nearby peatbogs are used to document the paleoenvironmental development from the Late Glacial to the Middle Holocene. In addition, two recently excavated key archaeological sections were selected to document human behavioral responses to the climatic development: Kostelní rokle, and Smolný kámen. This region remained mostly unsettled during the Upper Paleolithic (Magdalenian or Epigravettian) so that the Late Paleolithic colonization after the LGM appears to be a major behavioral adaptation. The Early and Middle Mesolithic foragers developed this pattern to be optimally adapted to the versatile landscape of sandstone plateaus and canyons during the Holocene. The aim was to exploit its changing vegetational, aquatic and terrestric faunal resources, until the Late Mesolithic. Read less

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3. Cooling rates of pyroclastic deposits inferred from mineral magnetic investigations: a case study... 2020

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwlV1LaxRBEC40QfCi8QGuxqUOHhRtsjsz3dsjIRCWJLIQCZLocehnNpBswu56iH_F3-LJP2ZVzyMbiIec5tA9DdNV01XVVd9XAO8GpTEuy0gCMkpROKuFNcYK6ctozSAOQ2lvX-Z0OO5U7N5mJNNB3WHdkroIjnYGQ62koJBnXZLx47YF-mTSpQ6KvI6y6ClyCn8apMzda9y2Rjcu5mpWNG-Mzf5TqFrITqox4c4Gq8X2W4ngMLFarJA53ueTNuBJ44fibq04z-BBmD2HRwepz-_1C_g9vuRuPqfITBILvIx4dU2mjlxtmo8-pFqvBXIp13wePDJKBS_OEoU1XpjTGWMjabgj8SDl_owGHRlNTJS29SvkfuLReWB-A0enLh7-_bM8mxk8NGaO77enO-NfwU3xW6jpuLe3pjsfXsLJ_t7x-Ito-jgIk6vRUni-2OCe9hQQRxmLodYylrpw2Ui5QtmQMT5oFIMqrHfByhhM5smx8cqXhfL5K0Cdh9LbqLSjWTKo0pDfqY3JbJCqtLoHH1tBVlc1T0fVMTKnfa5on6u0z9WwB5utrKvmn11UGfum3Hy96MGnVmA3w_9f7fX9pr-Bx1mSOdf8bsLacv4zvIU11qI-PBwdH_STQveZsvRHH9a_Hn2fTP4B6Fn1RQ

   Lied, Philipp; Kontny, Agnes; Nowaczyk, Norbert; Mrlina, Jan; Kämpf, Horst

   International Journal Of Earth Sciences : Geologische Rundschau, Vol. 109, Issue 5, pp. 1707 - 1725.

   Tephra layers of the Mýtina Maar, Czech Republic, contain ferrimagnetic Mg–Al-rich titanomagnetite, which is suggested to originate from a fractionated alkaline CO 2 -rich lithospheric mantle melt.... Read more

   Tephra layers of the Mýtina Maar, Czech Republic, contain ferrimagnetic Mg–Al-rich titanomagnetite, which is suggested to originate from a fractionated alkaline CO 2 -rich lithospheric mantle melt. We investigated the magnetic mineralogy and Curie temperature ( T C ) from tephra deposits of two drill cores (< 9 m depth). T C calculated (208 ± 14 °C) from chemical composition (Fe 2+ 0.8 Mg 0.5 Fe 3+ 1.1 Al 0.3 Ti 0.3 O 4 ) is in accordance with T C retrieved from cooling curves of temperature-dependent magnetic susceptibility measurements (195–232 °C). However, thermomagnetic curves are irreversible either with lower (type I) or higher (type II) T C in the heating curve. All curves show transition temperatures above ca. 390 °C, indicating maghemitization. We interpret the irreversibility of T C (∆ T C ) in terms of different degrees of cation ordering, overprinted or masked by different degrees of maghemitization, which is a low-temperature phenomenon. Negative ∆ T C indicates that original deposited titanomagnetite has cooled faster and, therefore, has stored a lower degree of cation ordering compared to heating/cooling rate of 11 °C/min in the Kappabridge. Type II with positive ∆ T C indicates higher degree of cation ordering, and, therefore, slower cooling rate. The central part of this deposit shows most severe maghemitization, indicating rather wet emplacement. We, therefore, suggest different eruption styles for deposition of type I pyroclastics with more phreatomagmatic and type II pyroclastics with more phreato-Strombolian eruption styles. Our study is a new approach to discriminate different cooling histories in maar deposits using the Curie temperature of titanomagnetite. We suggest that this method has the potential to discriminate different emplacement modes resulting from different eruption styles. Read less

   Journal Article  |  Full Text Online

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