期刊
ICHNOS-AN INTERNATIONAL JOURNAL FOR PLANT AND ANIMAL TRACES
卷 19, 期 1-2, 页码 75-83出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10420940.2012.664054
关键词
Didactyl tracks; Dromaeosauripus; Cretaceous; Jinju Formation; Korea
类别
资金
- National Research Foundation of Korea [2010-0023409]
New didactyl dinosaur tracks from the fine-grained sandstone of the Early Cretaceous Jinju Formation, Namhae area, Korea, are herein described as Dromaeosauripus jinjuensis ichnosp. nov. A trackway about 4.3 m long is composed of 12 consecutive didactyl traces. The tracks average about 9.3 cm long and 6.8 cm wide. Pace, stride, and pace angulation are 40 cm, 80 cm, and 175 degrees, respectively. D. jinjuensis is a small didactyl track characterized by slender digit impressions, very narrow divarication angle between digits III and IV, digit III slightly longer than IV, and sharp claw impressions. D. jinjuensis measurements differ significantly from D. hamanensis in length (only 60% of the latter), width (81%), length/width ratio (0.72), and digit thickness (55%). The didactyl tracks are tentatively interpreted to be formed by a small dromaeosaurid walking bipedally on a lake margin. D. jinjuensis represents the oldest theropod dinosaur tracks described in the Cretaceous of Korea and the second ichnospecies of Dromaeosauripus. It suggests more diversity and wider stratigraphic and paleogeographic distribution of dromaeosaurids. The track morphology may also indicate a more digitigrade gait.
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