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69Th Annual Meeting Society of Vertebrate Paleontology ISSN 0272-4634 September 2009 Society of Vertebrate Paleontology Society of Vertebrate Volume 29, Supplement to Number 3 Volume 69th Annual Meeting Paleontology Society of Vertebrate and Palaeontology of Vertebrate and the 57th Symposium Comparative Anatomy (SVPCA) University of Bristol Bristol, United Kingdom September 23-26, 2009 Program and Abstracts Vol. 29, Supplement to No. 3 September 2009 Wills Memorial 2 1/8” = 1/4 Mile Bristol/Precinct Map Building A4018, M5 junction 17 Badock Hall, Churchill Hall, Durdham Hall, Hiatt Baker Hall, KEY University Hall, Wills Hall Main Entrance to Sites Car Parks Traffic Flow Railway Station Victoria Rooms Burwalls via the Suspension Bridge A369, M5 junction 19 Bristol Marriott B3129 City Centre Hotel Avon Gorge Hotel to M32, M4 junction 19 (A38, A420, A421) Temple Meads Chemistry Building Broadmead Shopping Centre The Grand by Thistle Clifton Hill House Goldney Hall & Clifton Village DETAIL MAP Hotel Novotel Bristol Centre Bristol Temple Meads Railway Station Bristol Marriott A4 Royal Hotel A38, A420, M5 Bristol Airport Taunton, The South West Travelodge Bristol { Central Hotel SEE Bristol Hotel DETAIL MAP Hotel Ibis At-Bristol Bristol Centre Museum University of Bristol Vol. 29, Supplement to No. 3, September 2009 Vol. Poster Session III, (Friday) of isolated tridactyl footprints (and of both bipedal and quadrupedal trackways). However, LATE CRETACEOUS MICROVERTEBRATE FAUNA FROM THE NORTHERN most footprint shapes and shape variability have been treated descriptively so far, and no STATE OF COAHUILA, MEXICO study has yet tried to exploit the potentials of quantitative characterizations, in particular, MONTELLANO, Marisol, Instituto de Geologia, UNAM, Mexico, Mexico; MONROY, using geometric morphometrics (GM), which are perfectly suited for this particular. Using Heidi, Facultad de Estudios Superiores, Iztacala, Mexico, Mexico; HERNÁNDEZ-RIVERA, GM, we pursue to explore and visualize for the first time the variation of the ornithopod René, Instituto de Geologia, Mexico City, Mexico; TORRES, Esperanza, Posgrado Ciencias track record from Cameros Basin, as well as to disentangle the possible presence of two Biológicas, UNAM, Mexico City, Mexico distinct ornithopod footprint morphotypes. A sample of 43 well-preserved ornithopod Cameros tracks was implemented for comparison with other specimens from the world’s In Mexico, the Late Cretaceous microvertebrate faunas are poorly known. For several fossil record. The footprints were digitalized from field schemes and pictures, and thereafter years field work had been carried on in the northwestern corner of the State of Coahuila, a configuration of landmarks and semilandmarks where used to capture the geometry and where outcrops of the Aguja Formation are present. Previous paleomagnetic studies showed the outline of the footprints. On the one hand, a principal components analysis allows a normal polarity which correlates to the chron C33.1n and corresponds to the upper visualizing that, 1) digit width, the relatively footprint elongation, and the location of both Campanian. Sediments had been collected and screen washed for microfossils, which are hypex, and 2) the relatively footprint width related to digital angulation, both account for not very abundant. The recovered taxa include the chondricthyes Lonchidion selachos, more than 50% of the sample variability. On the other hand, multivariate regressions reveal Squalicorax sp., the rays Myledaphus bipartitus, Myledaphus sp., and Ptychotrygon sp., that footprint shape is statistically correlated with size, in such a way that larger footprints the osteichthyes Lepisosteus sp., and an indetermined phyllodontid form. This assemblage tend to be broader whereas smaller tend to be more slender. This result suggests that the of aquatic forms indicate brackish to freshwater environment, like an estuarine. Also the long-time observed morphotypes are possibly contained within an allometric continuum, crocodiles Goniopholis sp., Brachychampsa sp, and the giant Deinosuchus riograndesis and therefore, that they may have important implications in dinosaur foot morphology and/ are present; the dinosaurs are represented by the small theropods: cf. Troodon, three forms or biomechanics. of the genus Saurornitholestes, S. langstoni, S. n. sp. A? and S. n. sp. C., remains of other theropods: a form of an indetermined tyrannosaurid and teeth of kritosaurinae hadrosaur were also identified. Unusually, Richardoestesia is missing, this taxa had been reported as Poster Session I, (Wednesday) abundant in the Campanian southern faunas. The diversity recognized until now is poor BITE FORCE IN MEGALANIA compared to that reported from the fauna of the Big Bend National Park, Texas, remains of MORENO, Karen, UNSW, Paris, France; PINO, Andrea, PUC, Valparaiso, Chile; WROE, amphibians, lizards and mammals had not yet been recovered. The remains of osteichthyes Steven, UNSW, Sydney, Australia; MCHENRY, Colin, U of Newcastle, Newcastle, Australia are the most abundant, follow by those of crocodile, theropods and chondrichthyes. This relative abundance of taxa is similar to that present in the southern faunas such as in the We performed 3D finite element analyses of the skulls ofVaranus komodoensis and V. Big Bend National Park, Texas; compared to the northern faunas (p.e., Two Medicine Fm., giganteus, two of the largest modern varanids. The results show that their bite force is Dinosaur Provincial Park) where the theropod material is much more abundant. So far, proportional to the square of the linear dimensions, despite distinct bone stress distributions this fauna shares most of the genera and species of microvertebrates with the Campanian and feeding behaviors (“hold-and-pull” vs. “puncture-crushing”). We find however, that the southern faunas, supporting the hypothesis of the faunal latitudinal gradient proposed by horizontal component of the bite force is greater in V. komodoensis. This is due to specific previous authors. features in its skull architecture, which are almost certainly related to a distinct feeding behavior. Here, we use morphology and performance data obtained on V. komodoensis and V. giganteus to constrain the feeding behavior of an extinct varanid, Megalania prisca, for Technical Session IX, Thursday 2:30 which remains are too incomplete to build an accurate model of its skull. We find that the INSIGHTS INTO THE PRESERVATIONAL PATTERNS OF VERTEBRATE feeding behavior of M. prisca seems to resemble that of V. giganteus. Furthermore, the bite FOSSILS IN A FLUVIAL SYSTEM USING A TWO-DIMENSIONAL COMPUTER force of M. prisca is estimated to have been under 200N, an extremely low value for an MODEL animal this mass. Indeed, M. prisca is the largest terrestrial varanid known (5 meters) and MOORE, Jason, Texas A&M University, College Station, TX, USA allegedly a top predator in Australian Pleistocene. As the prey of Megalania were potentially large, its feeding behavior is unlikely to have been based solely on bite strength. The three-dimensional distribution of vertebrate fossils preserved in a lithological sequence can vary greatly from formation to formation. Some rock units show preferential preservation in channel lag or fill deposits, others in lacustrine or distal floodplain Poster Session III, (Friday) environments. In addition, the taphonomic characteristics of fossil assemblages (for example A HIGH-DIVERSITY EGGSHELL LOCALITY FROM THE HAUTERIVIAN- the size-frequency distribution of elements or the degree of modification by weathering BARREMIAN TRANSITION OF THE IBERIAN PENINSULA and abrasion) can also vary greatly. An understanding of the processes controlling these MORENO-AZANZA, Miguel, Grupo Aragosaurus. Universidad de Zaragoza, Zaragoza, variations is necessary to accurately assess the information lost from fossil assemblages, Spain; GASCA, José Manuel, Grupo Aragosaurus. Universidad de Zaragoza, Zaragoza, to determine when it is possible to validly compare assemblages and potentially to enable Spain; CANUDO, José Ignacio, Grupo Aragosaurus. Universidad de Zaragoza, Zaragoza, prediction of the fossiliferousness of unstudied units. To investigate the patterns of Spain preservation in fluvial systems, I have created a two-dimensional model of an aggrading floodplain with a meandering channel, inhabited by a steady-state vertebrate community. La Cantalera site is located near the village of Josa (Iberian Range, Teruel, Spain). La During each time-step of the model, a proportion of the individuals in the community Cantalera site is an outcrop of Early Cretaceous clays from the Blesa Formation. The die, disarticulate and are transported across the floodplain. As the river migrates and fossiliferous beds are grey clays with abundant vegetal remains, charophytes, ostracods, the floodplain aggrades, the remains of these individuals become buried.The elements gastropods and vertebrate remains. The site was formed in a restricted palustrine are subject to degradation based on their individual physical properties whilst in the environment with periodic droughts. The charophyte assemblage dates the site as late taphonomically active zone, but are considered preserved once they are buried below this Hauterivian-early Barremian in age. level. By altering the parameters of the model, the influence of different properties on the distribution of fossils in a rock unit can be investigated. Altering the rate, severity or style The highly diverse vertebrate fossils comprise isolated teeth, disarticulated complete
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