|2011 GSA Annual Meeting in Minneapolis (9–12 October 2011)|
|Paper No. 27-23|
|Presentation Time: 9:00 AM-6:00 PM|
TERRESTRIAL VERTEBRATE TRACKWAYS OF THE EARLY JURASSIC NUGGET FORMATION AT DINOSAUR NATIONAL MONUMENT, UTAH
ANDERSON, Jacob L., Department of Geography/Geology, University of Nebraska at Omaha, Omaha, NE 68106, firstname.lastname@example.org, MELSTROM, Keegan M., University of Michigan, 5083 S. 45 1/2 rd, Cadillac, MI 49601, and PANOSKY, Joanna M., 4400 S Quebec st. Apt. W 206, Denver, CO 80237|
A track site in the Lower Jurassic Nugget Formation within Dinosaur National Monument, Utah, preserves numerous tracks and trackways. The large site located near Cub Creek within Dinosaur National Monument is approximately 70 meters by 20 meters of track-bearing surface. The tracks are preserved on sands beneath the massive eolian dune sands of the Nugget Formation. Tracks are preserved on two different layers separated by about 10cm. There are an estimated 300 tracks at this locality, with a track density of about 3 or 4 tracks per square on average. The size of the tracks ranges from approximately 10 to 25 cm wide. Most of the tracks are poorly preserved and probable undertracks, but there are many well preserved tracks in which pushup rims and toe impressions are evident and manus and pes can be distinguished. Some trackways can be distinguished in the field. Well preserved tracks and trackways can be identified as cheirothere tracks. The tracks and trackways do not appear to have a common orientation, indicating that the track makers were walking in different directions.
Another track site located north of the Carnegie quarry within Dinosaur National Monument is in approximately the same stratigraphic position as the Cub Creek site. Track density is much lower at this site and several trackways are easily distinguished, including a well preserved cheirothere trackway which extends for 14 meters.
Analysis of maps of the site near Cub Creek should make it possible to recognize additional and longer trackways at that site and determine the orientation of trackways. And, together with the long cheirothere trackway mapped at the other site, will provide information about the stride length and gait of the cheirothere track maker.
2011 GSA Annual Meeting in Minneapolis (9–12 October 2011)
General Information for this Meeting
|Session No. 27--Booth# 64|
Paleontology (Posters) I: Ecology and Phylogeny
Minneapolis Convention Center: Hall C
9:00 AM-6:00 PM, Sunday, 9 October 2011
Geological Society of America Abstracts with Programs, Vol. 43, No. 5, p. 85
© Copyright 2011 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.