ReBecca Hunt-Foster

ReBecca Hunt-Foster
National Park Service | NPS · Dinosaur National Monument

Master of Science

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50
Publications
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241
Citations

Publications

Publications (50)
Article
Full-text available
Heleocola piceanus, a new, relatively large metatherian from Upper Cretaceous (‘Edmontonian’) strata of the Williams Fork Formation in northwestern Colorado is described, based on a recently discovered jaw fragment (MWC 9744), in addition to three isolated teeth initially referred by other studies to Aquiladelphis incus and Glasbius piceanus. Altho...
Article
We describe a microvertebrate assemblage from the J&M site, of the Upper Cretaceous (Campanian–Maastrichtian) Williams Fork Formation. Breakdown of fossil bearing matrix was achieved with the use of heated dimethyl sulfoxide. Nine of the recovered taxa are new to both the J&M site and the Williams Fork Formation. The sharks Lonchidion griffisi, Chi...
Article
Full-text available
The discovery of the Mill Canyon Dinosaur Tracksite (MCDT) in the Cedar Mountain Formation (Ruby Ranch Member), near Moab in eastern Utah, has generated considerable interest. Following the completion of a preliminary study of natural exposures, reported elsewhere in this volume, an international team was assembled to excavate the site in 2013. Com...
Article
Full-text available
We present a previously discovered but undescribed late Early Cretaceous vertebrate fauna from the Holly Creek Formation of the Trinity Group in Arkansas. The site from the ancient Gulf Coast is dominated by semi-aquatic forms and preserves a diverse aquatic, semi-aquatic, and terrestrial fauna. Fishes include fresh- to brackish-water chondrichthya...
Conference Paper
The timing of Cretaceous carbon isotope excursions (CIEs) that provide crucial information on paleoclimate continues to be rather poorly constrained (e.g. Erba et al. 2015, GSA SP 511). We propose that a combined U-Pb dating approach using zircons from paleosol cryptotephra and pedogenic carbonates produces significant improvements. Mature paleosol...
Article
Full-text available
The Mail Station Dinosaur Tracksite (MSDT), situated on Bureau of Land Management land in San Juan County, Utah, is one of the largest and best-preserved Lower Jurassic dinosaur tracksites in the western USA. The site is located stratigraphically near the top of the Navajo Sandstone Formation (Glen Canyon Group) and is dominated by large theropod t...
Article
Full-text available
In 2016 and 2017, the Utah Geological Survey partnered with the U.S. Bureau of Land Management to conduct a paleontological inventory of the Morrison Formation south and west of Blanding, Utah, along the eastern margin of the Bears Ears National Monument. The Morrison in this region is critical to understanding Upper Jurassic stratigraphy across th...
Article
Full-text available
The Little Houston Quarry in the Black Hills of Wyoming contains the most diverse vertebrate fauna in the Morrison Formation (Upper Jurassic) north of Como Bluff and the second-most diverse in the entire formation, after Reed’s Quarry 9. The deposit was an occasionally reactivated abandoned river channel, in interbedded green mudstone and laminated...
Article
Full-text available
The Mygatt-Moore Quarry is a deposit of several thousand dinosaur bones in the Brushy Basin Member of the Morrison Formation in western Colorado. The site has been worked for more than 30 years and nearly 2400 mapped specimens have been collected. This study gathered data about the quarry from many sources to investigate the origin of the deposit....
Article
Full-text available
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence st...
Article
Full-text available
The Mygatt-Moore Quarry is a deposit of several thousand dinosaur bones in the Brushy Basin Member of the Morrison Formation in western Colorado. The site has been worked for more than 30 years and nearly 2400 mapped specimens have been collected. This study gathered data about the quarry from many sources to investigate the origin of the deposit....
Article
Whereas ornithomimosaurs (ostrich-mimic dinosaurs) are well known from Asia during the Early Cretaceous, they are less well known from this time in North America. Represented by a single specimen consisting of pedal elements, a new North American taxon, Arkansaurus fridayi, gen. et sp. nov., consists of a nearly complete right foot, recovered from...
Conference Paper
Full-text available
In the late 1980’s an assemblage of vertebrate material was discovered at the Briar Site Gypsum Mine, the site of extensive sauropod and theropod tracks from the overlying De Queen Limestone outside of Dierks, Arkansas. The assemblage was discovered in an organic-rich, pyrite-bearing dark grey mudstone. Many of the large vertebrate material contain...
Conference Paper
Ornithomimosaurs (ostrich-mimic dinosaurs) are well known from Asia during in the Early Cretaceous, but they are less well known from this time in North America. Represented by a single specimen consisting of pedal elements, a new North American taxon, which consists of a nearly complete right foot, recovered from the Lower Cretaceous (Albian/Aptia...
Conference Paper
Dinosaur paleontology provides for a unique synergy that can combine the public’s interest in science with the federal mandate for the inventory, monitoring, and educational use of paleontological resources on public lands. Dinosaur fossils have been well known on the public lands of the Rocky Mountain West for over 150 years. Collaborative efforts...
Conference Paper
In the late 1980’s an assemblage of vertebrate material was discovered at the Briar Site Gypsum Mine, the site of extensive sauropod and theropod tracks from the overlying De Queen Limestone outside of Dierks, Arkansas. The assemblage was discovered in an organic-rich, pyrite-bearing dark grey mudstone. Many of the large vertebrate material contain...
Article
Full-text available
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence st...
Conference Paper
Full-text available
Every year, well-meaning researchers are reprimanded or issued citations for failing to seek the required permissions to work on public land. Permitting is required by law and may involve several steps including environmental review, and because this involves a variety of officials, there is a certain amount of time involved in issuing the permit....
Conference Paper
Looting and vandalism of paleontological resources on public lands has been an ongoing problem for well over a century. Fascination with dinosaurs and other prehistoric creatures, largely fueled by movie and toy industries, feeds individual desires to possess these irreplaceable pieces of Earth’s history rather than understand them and their place...
Conference Paper
In 2009, the Paleontological Resources Preservation Act was enacted, instructing the Secretary to manage and protect paleontological resources on Federal Land using scientific principles and expertise, and to develop plans to increase public awareness about the significance of paleontological resources. Many rural communities throughout the country...
Conference Paper
The Early Jurassic Navajo Sandstone is a vast eolian deposit that represents the largest erg to have existed on Earth. Exposed throughout southern Utah, the Navajo Sandstone contains localized, water-lain interdune deposits consisting of impermeable, fine-grained sediments. Through both trace and body fossil evidence, these interdunal “lakes" are k...
Conference Paper
In 2010 the Bureau of Land Management (BLM) created a field-based paleontology position in the Canyon Country District in Southeastern Utah. BLM officials chose this area based on its world-renowned fossil resources and multiple-use activities that take place in this region, leading to a delicate balance between science, and other activities such a...
Conference Paper
An otherwise essentially complete Tricrepicephalus texanus found in the Weeks Formation (Cambrian, global Series 3, Guzhangian) at North Canyon, Utah, is missing the distal half of the left pygidial spine, with the broken surface slightly rounded off and more rugose than the smoother, intact part of the spine. The right spine is intact and complete...
Article
Full-text available
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence st...
Article
Full-text available
Although only recognized as a discrete stratigraphic unit since 1944, the Cedar Mountain Formation represents tens of millions of years of geological and biological history on the central Colorado Plateau. This field guide represents an attempt to pull together the results of recent research on the lithostratigraphy, chronostratigraphy, sequence st...
Article
Full-text available
Mygatt-Moore Quarry in the Brushy Basin Member of the Upper Jurassic Morrison Formation is one of the more important large dinosaur quarries in the formation, yielding fossils of sauropod dinosaurs including Apatosaurus, Camarasaurus, and an indeterminate diplodocine (cf. Diplodocus or Barosaurus), the theropod dinosaurs Allosaurus and Ceratosaurus...
Article
The Williams Fork Formation is a late Campanian-early Maastrichtian unit of the Mesaverde Group, and this study focuses on the exposures found on Bureau of Land Management-administered lands in northwestern Colorado. The formation is comprised of thick sandstones, dark, often carbonaceous mudstones, and coals representing a coastal, prograding delt...
Conference Paper
In July of 1941, J. W. Stovall of the University of Oklahoma, with graduate student Don Savage and undergraduate Wann Langston, Jr., traveled to the San Juan Basin of New Mexico to collect fossils for the University of Oklahoma Museum. While on this trip they discovered the remains of the largest and most complete specimen of Pentaceratops sternber...
Article
Full-text available
A bone bed in the middle part of the Javelina Formation (Maastrichtian) in Texas yielded parts of about 37 identifiable ceratopsid dinosaur bones, mostly appendicular and limb girdle elements belonging to one juvenile and two adult individuals of Torosaurus cf. utahensis. The bone bed is a lag assemblage comprising large immobile parts of the skele...

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