Crossing Slopes: Unusual Trackways of Recent Birds and Implications for Tetrapod Footprint Preservation
Autor: | Novella L. Razzolini, Hendrik Klein |
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Rok vydání: | 2017 |
Předmět: | |
Zdroj: | Ichnos. 25:252-259 |
ISSN: | 1563-5236 1042-0940 |
DOI: | 10.1080/10420940.2017.1337634 |
Popis: | In a neoichnological study, the trackway of a small recent bird (Limicola- like) crossing the slope of a river bank is documented and analyzed in detail. It was preserved along the Issene River in the western High Atlas of Morocco. Photogrammetry and 3-D techniques revealed three different phases of the trackmaker's movement that were essentially controlled by the biomechanical adaptations of the limbs and by the differences in how the foot was indented from up to down slope on the tilted, mud-cracked surface of the tilted mud-cracked surface. The slope of the surface is reflected in the variation of different track parameters, such as stride length, pace length, pace angulation, and imprint depths of different digits. A “didactyl” or fully collapsed morphology preservation pattern is observed as an intra-trackway morphological variation along the whole trackway. Tracks preserve only the up-slope digits: left tracks typically preserve only digit III and IV impressions, while right tracks preserve ... |
Databáze: | OpenAIRE |
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