| An Unusual, Three-Dimensionally Preserved, Large Hadrosauriform Pes Track from “Mid”-Cretaceous Jiaguan Formation of Chongqing, China |
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| 作者姓名： | Xing Lid Phil R. Bell Jerald D. Harris and Philip J. Currie |
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| 作者单位： | 1 Department of Biological Sciences, University of Alberta, 11455 Saskatchewan Drive, Edmonton, Alberta T6G 2E9, Canada;2 Key Laboratory of Evolutionary Systematics of Vertebrates, Chinese Academy of Sciences, PO Box 643, 100044 Beijing, China;3 Pipestone Creek Dinosaur Initiative, Clairmont, Alberta T0H 0W0, Canada;4 Physical Sciences Department, Dixie State College, 225 South 700 East, St. George, Utah 84770, USA |
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| 摘 要： | Three-dimensional tracks provide unique insights into the locomotor mechanics of their track makers. An isolated, large hadrosauriform print attributable to Caririchnium lotus from the “mid”-Cretaceous Lotus track site (Jiaguan Formation) in China permits reconstruction of the footfall, weight-bearing, and kick-off phases of the step cycle. Large-scale modifications of the pes during the step cycle indicate C. lotus trackmakers were capable of locomotory modifications in response to substrate consistency beyond the “expected” shift between bipedal and quadrupedal postures. An unusual curvature to the trace of one of the outer digits indicates substantial transverse mobility. The remaining digits demonstrate lesser degrees of transverse movement accompanied by extension of the digits during footfall. The absence of overprinted scale-scratch marks and toe drags are consistent with a vertical kick-off of the pes and concomitant flexion of the digits. This track suggests that pedal mobility in C. lotus track makers was greater than previously suspected and has implications for reconstructions of hadrosauriform locomotion.
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| 关 键 词： | hadrosauriform locomotion footprints Cretaceous step cycle |
| 收稿时间： | 2011/10/17 0:00:00 |
| 修稿时间： | 1/9/2012 12:00:00 AM |
An Unusual,Three‐Dimensionally Preserved,Large Hadrosauriform Pes Track from “Mid”‐Cretaceous Jiaguan Formation of Chongqing,China |
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| Authors: | XING Lida Phil R BELL Jerald D HARRIS Philip J CURRIE |
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| Institution: | 1. Department of Biological Sciences, University of Alberta, 11455 Saskatchewan Drive, Edmonton, Alberta T6G 2E9, Canada;2. Key Laboratory of Evolutionary Systematics of Vertebrates, Chinese Academy of Sciences, PO Box 643, 100044 Beijing, China;3. Pipestone Creek Dinosaur Initiative, Clairmont, Alberta T0H 0W0, Canada.;4. Physical Sciences Department, Dixie State College, 225 South 700 East, St. George, Utah 84770, USA |
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| Abstract: | Three‐dimensional tracks provide unique insights into the locomotor mechanics of their track makers. An isolated, large hadrosauriform print attributable to Caririchnium lotus from the “mid”‐Cretaceous Lotus track site (Jiaguan Formation) in China permits reconstruction of the footfall, weight‐bearing, and kick‐off phases of the step cycle. Large‐scale modifications of the pes during the step cycle indicate C. lotus trackmakers were capable of locomotory modifications in response to substrate consistency beyond the “expected” shift between bipedal and quadrupedal postures. An unusual curvature to the trace of one of the outer digits indicates substantial transverse mobility. The remaining digits demonstrate lesser degrees of transverse movement accompanied by extension of the digits during footfall. The absence of overprinted scale‐scratch marks and toe drags are consistent with a vertical kick‐off of the pes and concomitant flexion of the digits. This track suggests that pedal mobility in C. lotus track makers was greater than previously suspected and has implications for reconstructions of hadrosauriform locomotion. |
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| Keywords: | hadrosauriform locomotion footprints Cretaceous step cycle |
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