An unusual association of hadrosaur and therizinosaur tracks within Late Cretaceous rocks of Denali National Park, Alaska

被引:17
作者
Fiorillo, Anthony R. [1 ]
McCarthy, Paul J. [2 ]
Kobayashi, Yoshitsugu [3 ]
Tomsich, Carla S. [2 ]
Tykoski, Ronald S. [1 ]
Lee, Yuong-Nam [4 ]
Tanaka, Tomonori [3 ]
Noto, Christopher R. [5 ]
机构
[1] Perot Museum Nat & Sci, Dept Paleontol, Dallas, TX 75201 USA
[2] Univ Alaska, Dept Geosci, Fairbanks, AK 99775 USA
[3] Hokkaido Univ Museum, Kita Ku, Kita 10,Nishi 8, Sapporo, Hokkaido 0600810, Japan
[4] Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 08826, South Korea
[5] Univ Wisconsin Parkside, Dept Biol Sci, Kenosha, WI 53141 USA
关键词
CANTWELL FORMATION; DINOSAURS; RANGE; BASIN; DISCRIMINATION; STRATIGRAPHY; PERSPECTIVE; MORPHOLOGY; EVOLUTION; OSTEOLOGY;
D O I
10.1038/s41598-018-30110-8
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
We report details of a unique association of hadrosaur and therizinosaur tracks found in the Late Cretaceous lower Cantwell Formation, Denali National Park, central Alaska Range, Alaska. This rock unit is now well-documented as a source of thousands of fossil footprints of vertebrates such as fishes, pterosaurs, and avialan and non-avialan dinosaurs. The lower Cantwell Formation in this area consists of numerous fining-upward successions of conglomerates and pebbly sandstones, cross-stratified and massive sandstones, interbedded sandstones and siltstones, organic-rich siltstones and shales, and rare, thin, bentonites, typically bounded by thin coal seams, and it contains a diverse fossil flora. We report the first North American co-occurrence of tracks attributable to hadrosaurs and therizinosaurs in the lower Cantwell Formation. Although previously un-reported in North America, this association of hadrosaur and therizinosaur tracks is more characteristic of the correlative Nemegt Formation in central Asia, perhaps suggesting that parameters defining the continental ecosystem of central Asia were also present in this part of Alaska during the Latest Cretaceous.
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页数:12
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