Micrometeorite Impacts in Beringian Mammoth Tusks and a Bison Skull Page: 3 of 11
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Fij L Close up rholosrap and cnlagcmenl oFtmeta[Iic pai tickes 'zttedded in usk I Sowia al eitmic can be ktfl
assowiated with Uiesc part tck i aised urn (A), "burn t ng (B U). and builgedi cemiter (B)
Fig 2 (a] Close-up phtifogtapF of a particle embedded in tusk 2 (IS) X-iay image or die same pat ticie tn cross
sccuon showing hemtsphCcc dCbi-t panrn Tbh pariigk ' abeid tho S s o as p~iukc~ B 'o F'g I
Sectiornig and polishing of tusk/particle samples below (sl mum) the zone of eoncentrsked debris
shcrw many small pauriles (<20 pim diameter) widely dispersed within the tusk mstri The taurnbel
and fundamental curmpkxity of the embedded particles suggest thst ihey are Lhe result of a nature]
explustve event, and determmrug their dhem teal COmpYOSLIOtis key to discovering their origin and
the nature of this ancient eveinl
XWanalyzedtpei (tles extracted fionsix oftchc usks and bisonakull with lasei abanOIILdUCLIVCly
coupled plasma mass spectroreetry (LA-]CP-MS) In paxtictilar, we determined Ni/Fe ratios, as these
are diagnostic of meteoritic and terreshiial compositions Oui results are given in Table 1. which
also include, for comparison, values foi ai vanity of extraterrestrial and tei restrial satuples These
analyses cfii in t.he high Fe contend of the partcles and indicatae conipositiotis highly ema iched in Ni
and depleted in Ti, unlike any ter restrial values A particle fioin tusk 1 also has a Ti/Fe ratio of 0 004,
which is 3% of tei isirial values and comparable icr those foi CI chondrites Fiom X ray fluorescence3
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Hagstrum, Jonathon T.; Firestone, Richard B; West, Allen; Stefanka, Zsolt & Revay, Zsolt. Micrometeorite Impacts in Beringian Mammoth Tusks and a Bison Skull, article, February 3, 2010; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc835563/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.