Ebert Y, Shaar R, Stein M. Decadal geomagnetic secular variations from greigite bearing Dead Sea sediments. Geochemistry, Geophysics, Geosystems [Internet]. 2021 :e2021GC009665. Publisher's Version
Shaar R, Matmon A, Horwitz LK, Ebert Y, Chazan M, Arnold M, Aumaître G, Bourlès D, Keddadouche K. Magnetostratigraphy and cosmogenic dating of Wonderwerk Cave: New constraints for the chronology of the South African Earlier Stone Age. Quaternary Science Reviews [Internet]. 2021;259 :106907. Publisher's VersionAbstract
Cave sediments pose dating challenges due to complex depositional and post-depositional processes that operate during their transport and accumulation. Here, we confront these challenges and investigate the stratified sedimentary sequence from Wonderwerk Cave, which is a key site for the Earlier Stone Age (ESA) in Southern Africa. The precise ages of the Wonderwerk sediments are crucial for our understanding of the timing of critical events in hominin biological and cultural evolution in the region, and its correlation with the global paleontological and archaeological records. We report new constraints for the Wonderwerk ESA chronology based on magnetostratigraphy, with 178 samples passing our rigorous selection criteria, and fourteen cosmogenic burial ages. We identify a previously unrecognized reversal within the Acheulean sequence attributed to the base of the Jaramillo (1.07 Ma) or Cobb Mtn. subchrons (1.22 Ma). This reversal sets an early age constraint for the onset of the Acheulean, and supports the assignment of the basal stratum to the Olduvai subchron (1.77–1.93 Ma). This temporal framework offers strong evidence for the early establishment of the Oldowan and associated hominins in Southern Africa. Notably, we found that cosmogenic burial ages of sediments older than 1 Ma are underestimated due to changes in the inherited 26Al/10Be ratio of the quartz particles entering the cave. Back calculation of the inherited 26Al/10Be ratios using magnetostratigraphic constraints reveals a decrease in the 26Al/10Be ratio of the Kalahari sands with time. These results imply rapid aeolian transport in the Kalahari during the early Pleistocene which slowed during the Middle Pleistocene and enabled prolonged and deeper burial of sand while transported across the Kalahari Basin.
Shaar R, Bechar S, Finkelstein I, Gallet Y, Martin MAS, Ebert Y, Keinan J, Gonen L. Synchronizing geomagnetic field intensity records in the Levant between the 23rd and 15th centuries BCE: chronological and methodological implications. Geochemistry, Geophysics, Geosystems [Internet]. 2020 :e2020GC009251. Publisher's Version
Ebert Y, Shaar R, Levy EJ, Zhao X, Roberts AP, Stein M. Magnetic properties of late Holocene Dead Sea sediments as a monitor of regional hydroclimate. Geochemistry, Geophysics, Geosystems [Internet]. 2020 :e2020GC009176. Publisher's Version
Vaknin Y, Shaar R, Gadot Y, Shalev Y, Lipschits O, Ben-Yosef E. The Earth’s magnetic field in Jerusalem during the Babylonian destruction: A unique reference for field behavior and an anchor for archaeomagnetic dating. PloS one [Internet]. 2020;15 (8) :e0237029. Publisher's Version
Amiel N, Shaar R, Sivan O. The effect of early diagenesis in methanic sediments on sedimentary magnetic properties: Case study from the SE Mediterranean continental shelf. Frontiers in Earth Science [Internet]. 2020;8 :283. Publisher's Version
Grossman Y, Aharonson O, Shaar R, Kletetschka G. Experimental determination of remanent magnetism of dusty ice deposits. Earth and Planetary Science Letters [Internet]. 2020;545 :116408. Publisher's Version
Shemer M, Crouvi O, Shaar R, Ebert Y, Matmon A, Horwitz LK, Eisenmann V, Enzel Y, Barzilai O, Team ASTER, et al. Geochronology, paleogeography, and archaeology of the Acheulian locality of ‘Evron Landfill in the western Galilee, Israel. Quaternary Research. 2019;91 (2) :729–750.
Behar N, Shaar R, Tauxe L, Asefaw H, Ebert Y, Heimann A, Koppers AAP, Ron H. Paleomagnetism and paleosecular variations from the Plio-Pleistocene Golan Heights volcanic plateau, Israel. Geochemistry, Geophysics, Geosystems. 2019.
Zeigen C, Shaar R, Ebert Y, Hovers E. Archaeomagnetism of burnt cherts and hearths from Middle Palaeolithic Amud Cave, Israel: Tools for reconstructing site formations processes and occupation history. Journal of Archaeological Science. 2019;107 :71–86.
Stillinger MD, Feinberg J, Ben-Yosef E, Shaar, R., Hardin JW, Blakely JA. A Rejoinder on the Value of Archaeomagnetic Dating: Integrative Methodology Is the Key to Addressing Levantine Iron Age Chronology. Near Eastern Archaeology [Internet]. 2018;81 (2) :141–144. Publisher's Version
Shaar R, Hassul E, Raphael K, Ebert Y, Segal, Y, Eden I, Vaknin Y, S. M, Nowaczyk N, Chauvin A, et al. The First Catalog of Archaeomagnetic Directions From Israel With 4,000 Years of Geomagnetic Secular Variations. Frontiers in Earth Sciences [Internet]. 2018;164. Publisher's Version
Ebert Y, Shaar R, Emmanuel S, Nowaczyk N, Stein M. Overwriting of sedimentary magnetism by bacterially mediated mineral alteration. geology [Internet]. 2018;46 (4) :291-294. Publisher's Version
Shahack-Gross R, Shaar R, Hassul E, Ebert Y, Forget M, Nowaczyk N, Marco S, Finkelstein I, Agnon A. Fire and collapse: Untangling the formation of destruction layers using archeomagnetism. Geoarchaeology [Internet]. 2018;33 :513-528. Publisher's Version
Farchi E, Ebert Y, Farfurnik D, Haim G, Shaar R, Bar-Gill N. Quantitative vectorial magnetic imaging of multi domain rock forming minerals using nitrogen-vacancy centers in diamond. Spin [Internet]. 2017;7 (3). Publisher's Version
Shaar R, Tauxe L, Goguitchaichvili A, Devidze M, Licheli V. Further evidence of the Levantine Iron Age geomagnetic anomaly from Georgian pottery. Geophysical Research Letters [Internet]. 2017;44. Publisher's Version
Ben-Yosef E, Milman M, Shaar R, Tauxe L, Lipschits O. Six centuries of geomagnetic intensity variations recorded by royal Judean stamped jar handles. Proceedings of the National Academy of Sciences [Internet]. 2017. Publisher's Version
Shaar R, Tauxe L, Ron H, Agnon A, Ebert Y, Finkelstein I. The Tel Megiddo paleointensity project: toward a high resolution reference curve for archaeomagnetic dating. In: Megiddo VI. Tel Aviv: Tel-Aviv University ; 2017. shaar_etal_megiddo_vi.pdf
Shaar R, Ben-Yosef E. paleomagnetic geochronology of Quaternary sequences in the Levant. In: Quaternary Environments, Climate Change, and Humans in the Levant. ; 2017. paleomagnetic_quaternary_levant_4_0_withfigures.pdf
Tauxe L, Shaar R, Jonestrask L, Swanson‐Hysell NL, Minnett R, Koppers AAP, Constable CG, Jarboe N, Gaastra K. PmagPy: Software package for paleomagnetic data analysis and a bridge to the Magnetics Information Consortium (MagIC) Database." Geochemistry, Geophysics, Geosystems (2016). eochemistry, Geophysics, Geosystems [Internet]. 2016. Publisher's Version