Papers by Daniel Brinkman
Documents in the Division of Vertebrate Paleontology Archives at the Yale Peabody Museum demonstr... more Documents in the Division of Vertebrate Paleontology Archives at the Yale Peabody Museum demonstrate deep ties between the division and Dinosaur State Park. These ties began on 25 August 1966 and have continued intermittently to the present. A number of people associated with the division played pivotal roles in the establishment and development of the park and in the nurturing and fulfillment of its educational and scientific missions. They did so by either contributing to the excavation of the tracksites, supporting the park's educational programs, seeking recognition of the park's importance from both the Society of Vertebrate Paleontology and National Park Service, writing about the site, and/or documenting and analyzing the over 1,800 archosaur footprints found there. Most notable has been the work of John Ostrom, Grant Meyer, and Peter Galton. It is hoped that the longtime ties between the division and the park will only strengthen in the years ahead.
Geology of the Intermountain West, 2018
The sauropod dinosaur genus Diplodocus Marsh, 1878, is currently typified by a morphologically un... more The sauropod dinosaur genus Diplodocus Marsh, 1878, is currently typified by a morphologically undiagnosable type species, D. longus Marsh, 1878. Only two caudal vertebrae and an associated partial chevron of its holotype (Yale Peabody Museum [YPM] VP.001920) remain reasonably complete, but more, fragmentary caudal vertebrae are available, and provide additional morphological information. YPM VP.001920 can be referred to Diplodocus generally, but cannot be distinguished from other Diplodocus species based on autapomorphies. Thus, the genus Diplodocus would have to be considered a nomen dubium. In order to resolve this unsatisfactory taxonomic issue, Tschopp and Mateus (2016) proposed to designate a new type species for the genus Diplodocus: namely, the well-known D. carnegii Hatcher, 1901.Herein, we expand upon historical and taxonomic issues concerning the holotype of D. longus, in order to: (1) provide additional imagery and information on the specimen and (2) to address comments ...
Cretaceous Research, 1999
Cretaceous terrestrial sediments deposited in a series of intracratonic basins across the Gobi De... more Cretaceous terrestrial sediments deposited in a series of intracratonic basins across the Gobi Desert region of southern Mongolia and northern China contain a unique and diverse vertebrate fauna. In 1996 an expedition jointly sponsored by the Mongolian Paleontological Center and the Hayashibara Museum of Natural Sciences revisited a number of famous vertebrate fossil localities in the eastern Gobi region of Mongolia and, as part of a broad geological and paleontological study, collected a series of paleomagnetic samples from measured sections at Bayn Shireh, Burkhant and Khuren Dukh, as well as from an unmeasured locality adjacent to Khuren Dukh. Expedition members also collected palynologic samples from Khuren Dukh and the adjacent locality. Paleomagnetic analysis shows that all the sites from which samples were collected display detrital remnant magnetization that is consistently normal in polarity. The measured Cretaceous magnetic directions are oriented to the east or northeast of the present day expected direction (declination 356.2 , inclination 65.2), and they are wholly concordant with that expected for a mid-latitude Northern Hemisphere sampling locality, and with the directions for this period reported by other workers. These results, when considered in tandem with the known biostratigraphy, strongly suggest that the sedimentary deposits at all four localities in the eastern Gobi correlate to the normal polarity chron 34 (the Cretaceous Long Normal), which ranges in age from approximately 121 to 83.5 million years. Previous vertebrate, invertebrate and palynological data from Khuren Dukh suggest that the lower and middle parts of the stratigraphic interval exposed there (which have been assigned to the Shinekhudag Formation) are 'Khukhtekian' in age and correspond to the Aptian-Albian interval that can be broadly correlated to the older, Early Cretaceous part of the Cretaceous Long Normal, C34n. New palynologic data presented here indicate that these strata are no older than middle to late Albian. The rocks at Bayn Shireh (the Bayn Shireh Formation) have been assigned a 'Baynshirenian' biostratigraphic age that may range from Cenomanian to early Campanian. The magnetostratigraphy results presented here indicate that the strata at both the Bayn Shireh and Burkhant localities do not cross the Santonian/Campanian Stage boundary, however, as this is believed to lie at, or very near, the C34n/C33r reversal boundary. Thus, the Bayn Shireh Formation was most likely deposited near the end of the Cretaceous Long Normal Interval, no later than the latest Santonian.
Oklahoma Geology Notes, 1997
Bulletin of the Peabody Museum of Natural History, 2021
Herein as a preface to Jukar's ongoing comprehensive systematic review, we introduce the fossil v... more Herein as a preface to Jukar's ongoing comprehensive systematic review, we introduce the fossil vertebrate collection made by G. Edward Lewis in 1932 as part of the Yale-North India Expedition to British India, and briefly discuss its historical and scientific significance. The collection, which consists of approximately 1,300 specimens collected from 106 sites, was made 100 years after the first fossils were reported by Europeans in the Siwalik deposits of the Indian subcontinent, and includes several important specimens, most notably fossil primates. Studies of the fossils collected by Lewis on this 1932 expedition have had a substantial and long-lasting influence on Siwalik paleontology, and motivated much subsequent work in this region by both western and local Indian and Pakistani researchers. Studies of primate specimens collected and first described by Lewis have also heavily influenced the field of paleoanthropology and debates surrounding the origin of our species.
Since the 1969 description of Deinonychus antirrhopus Ostrom, cooperative pack hunting behavior f... more Since the 1969 description of Deinonychus antirrhopus Ostrom, cooperative pack hunting behavior for this species and, subsequently, for many other nonavian theropods, has attained wide acceptance. In this paper we assess the hypothesis of mammal-like cooperative pack hunting in D. antirrhopus and other nonavian theropods by examining the behaviors of extant diapsids. Through phylogenetic inference and character optimization, we conclude that this hypothesis is both unparsimonious and unlikely for these taxa and that the null hypothesis should therefore be that nonavian theropod dinosaurs were solitary hunters or, at most, foraged in loose associations. Moreover, we present new evidence from the D. antirrhopus type locality of probable intraspecific aggression in this species. Additionally, our study suggests that some evidence that has previously been proposed in support of highly gregarious, mammal-like behavior in nonavian theropods (e.g., certain theropod-dominated fossil assemblages, preserved bite-mark injuries on some specimens, and the preponderance of theropod trackways at some sites) may alternatively be interpreted as evidence that nonavian theropod behavior was more agonistic, cannibalistic, and diapsid-like than has been widely believed.
SYSTEMATIC REVISION OF SOME POST—ARROYO CLEAR FORK GROUP (LEONARDIAN: LOWER PERMIAN) CAPTORHINIDS FROM NORTH—CENTRAL TEXAS, 1991
Since 1882 numerous specimens of captorhinids have been recovered from deltaic deposits of the po... more Since 1882 numerous specimens of captorhinids have been recovered from deltaic deposits of the post-Arroyo Clear Fork Group (Leonardian: Lower Permian) of north-central Texas. An analysis of skulls, tooth plates, and some postcranial material suggests that two major lineages of captorhinids, the Labidosaurus and Captorhinus groups, were evolving in this area during deposition of the Vale and Choza Formations. Only the Captorhinus group was abundant. The taxa comprising this group are distinguished by their dentition or by the robustness of their mandibles. The Captorhinus group is a continuous phylogenetic lineage, composed of Captorhinus aquti (Cope 1882), Captorhinoides valensis Olson 1951, the new combination Captorhinoides
barkeri (Olson 1954), and possibly Waggoneria knoxensis Olson 1954, which prior to this report was considered to have possibly been a seymouriamorph. A new genus, Olsonia, is proposed to replace the synonymized Captorhinikos Olson 1954.
A partial dentary collected by Arthur Lakes in 1878 belong to the actinopterygian (ray-finned fis... more A partial dentary collected by Arthur Lakes in 1878 belong to the actinopterygian (ray-finned fish) genus Pachyrhizodus. Morphologically, the specimen compares most favorably to. P. leptopsis Cope, 1874, though P. leptopsis comes from Santonian and older beds. The importance of the specimen is that it is the first record of this genus of fish from the Maastrichtian of North America and of its historical association with pioneering Colorado geologist Arthur Lakes.
Page 1. OKLAHOMA GEOLOGICAL SURVEY Charles J. Mankin, Director ISSN 0078-4389 BULLETIN 146 First ... more Page 1. OKLAHOMA GEOLOGICAL SURVEY Charles J. Mankin, Director ISSN 0078-4389 BULLETIN 146 First Occurrence of Deinonychus antirrhopus (Dinosauria: Theropoda) from the Antlers Formation (Lower Cretaceous ...
Gaia, 1998
ABSTRACT: As in many carnivorous vertebrates, the teeth of most theropod dinosaurs are characteri... more ABSTRACT: As in many carnivorous vertebrates, the teeth of most theropod dinosaurs are characterized by serrations. Denticle size (or serration coarseness) and its inverse, serration density, scale with relation to absolute tooth size along the same allometric curve for most groups of carnivorous vertebrates. One of the few fossil groups traditionally interpreted as carnivorous that does not follow this same allometric scale is the theropod dinosaur family Troodontidae. Troodontids differ from all other theropods with the exception of ...
Cretaceous Research, Jan 1, 1999
Cretaceous terrestrial sediments deposited in a series of intracratonic basins across the Gobi De... more Cretaceous terrestrial sediments deposited in a series of intracratonic basins across the Gobi Desert region of southern Mongolia and northern China contain a unique and diverse vertebrate fauna. In 1996 an expedition jointly sponsored by the Mongolian Paleontological Center and the Hayashibara Museum of Natural Sciences revisited a number of famous vertebrate fossil localities in the eastern Gobi region of Mongolia and, as part of a broad geological and paleontological study, collected a series of paleomagnetic samples from measured sections at Bayn Shireh, Burkhant and Khuren Dukh, as well as from an unmeasured locality adjacent to Khuren Dukh. Expedition members also collected palynologic samples from Khuren Dukh and the adjacent locality. Paleomagnetic analysis shows that all the sites from which samples were collected display detrital remnant magnetization that is consistently normal in polarity. The measured Cretaceous magnetic directions are oriented to the east or northeast of the present day expected direction (declination 356.2°, inclination 65.2°), and they are wholly concordant with that expected for a mid-latitude Northern Hemisphere sampling locality, and with the directions for this period reported by other workers. These results, when considered in tandem with the known biostratigraphy, strongly suggest that the sedimentary deposits at all four localities in the eastern Gobi correlate to the normal polarity chron 34 (the Cretaceous Long Normal), which ranges in age from approximately 121 to 83.5 million years. Previous vertebrate, invertebrate and palynological data from Khuren Dukh suggest that the lower and middle parts of the stratigraphic interval exposed there (which have been assigned to the Shinekhudag Formation) are ‘Khukhtekian’ in age and correspond to the Aptian–Albian interval that can be broadly correlated to the older, Early Cretaceous part of the Cretaceous Long Normal, C34n. New palynologic data presented here indicate that these strata are no older than middle to late Albian. The rocks at Bayn Shireh (the Bayn Shireh Formation) have been assigned a ‘Baynshirenian’ biostratigraphic age that may range from Cenomanian to early Campanian. The magnetostratigraphy results presented here indicate that the strata at both the Bayn Shireh and Burkhant localities do not cross the Santonian/Campanian Stage boundary, however, as this is believed to lie at, or very near, the C34n/C33r reversal boundary. Thus, the Bayn Shireh Formation was most likely deposited near the end of the Cretaceous Long Normal Interval, no later than the latest Santonian.
Transport-Induced Abrasion of Fossil Reptilian Teeth: Implications for the Existence of Tertiary Dinosaurs In the Hell Creek Formation, Montana
Geology, 1987
Page 1. Transport-induced abrasion of fossil reptilian teeth: Implications for the existence of T... more Page 1. Transport-induced abrasion of fossil reptilian teeth: Implications for the existence of Tertiary dinosaurs in the Hell Creek Formation, Montana Scott Argast, James 0. Farlow, Rose M. Gäbet, Daniel L Brinkman Department ...
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Papers by Daniel Brinkman
barkeri (Olson 1954), and possibly Waggoneria knoxensis Olson 1954, which prior to this report was considered to have possibly been a seymouriamorph. A new genus, Olsonia, is proposed to replace the synonymized Captorhinikos Olson 1954.