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PALAIOS; October 2002; v. 17; no. 5; p. 516-521; DOI: 10.1669/0883-1351(2002)017<0516:TDMADF>2.0.CO;2
© 2002 SEPM Society for Sedimentary Geology
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Tail-Drag Marks and Dinosaur Footprints from the Upper Cretaceous Toreva Formation, Northeastern Arizona

GRACE V. IRBY1 and L. BARRY ALBRIGHT, III1

1 Department of Geology, Museum of Northern Arizona, Flagstaff, AZ 86001

ABSTRACT

The first Late Cretaceous dinosaur tracksite recorded from Arizona, preserving over 100 footprints, also preserves sinuous grooves here interpreted to be impressions left by the tail of a large vertebrate as it dragged through sediment now assigned to the Toreva Formation. Although no footprints are preserved that can be referred unambiguously to the individual or individuals that produced the tail-drag marks, the dynamic nature of the surface upon which the tracks were made, likely a river or stream shoreline, could have easily resulted in their disturbance or obliteration. As best as can be determined on the basis of a depauperate marine fauna from the lower part of the unit, and on the basis of a substantial hiatus that separates the lower and upper parts, the site is probably middle Coniacian in age. These tracks and drag marks add significantly to the exceptionally rare record of terrestrial vertebrates known from the Toreva Formation.




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W. M. Seiler and M. A. Chan
A Wet Interdune Dinosaur Trampled Surface in the Jurassic Navajo Sandstone, Coyote Buttes, Arizona: Rare Preservation of Multiple Track Types and Tail Traces
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[Abstract] [Full Text] [PDF]

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B. F. PLATT and S. T. HASIOTIS
A NEW SYSTEM FOR DESCRIBING AND CLASSIFYING TETRAPOD TAIL TRACES WITH IMPLICATIONS FOR INTERPRETING THE DINOSAUR TAIL TRACE RECORD
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