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New Avian tracks from the lower to middle Eocene at Fossil Hill, King George Island, Antarctica

  • Héctor G. Mansilla (a1), Silvina De Valais (a2), Wolfgang Stinnesbeck (a3), Natalia A. Varela (a1) and Marcelo A. Leppe (a1)...
Abstract
Abstract

Trace fossils are long known to exist in the Fossil Hill Formation (lower to middle Eocene) at Fildes Peninsula, King George Island, Antarctica. During fieldwork in 2009, abundant new avian tracks were recovered, which are analysed here. Three avian ichnotaxa are distinguished. The most common impressions are tridactyls and tetradactyls with slender digit imprints II–IV and a posterior hallux. They are included in the ichnogenus Gruipeda. In addition tridactyl and tetradactyl footprints with short and thick digit impressions are conferred to Uhangrichnus. The third ichnotaxon is a tridactyl impression with broad and short digits assigned to Avipeda. The latter taxon is here documented for the first time from Antarctica. These avian tracks are preserved in volcaniclastic sediments consisting in reddish-brown layers of mudstone intercalated with coarse sandstone. The sequence represents lacustrine environments which seasonally dried and were episodically refilled.

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      New Avian tracks from the lower to middle Eocene at Fossil Hill, King George Island, Antarctica
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      New Avian tracks from the lower to middle Eocene at Fossil Hill, King George Island, Antarctica
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Copyright
Corresponding author
mansilla_83@yahoo.com
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Antarctic Science
  • ISSN: 0954-1020
  • EISSN: 1365-2079
  • URL: /core/journals/antarctic-science
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