[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Sweeney Todd: The Demon Barber of New Papers
González Riga, B.J., and Calvo, J.O. 2007. Huellas de dinosaurios saurópodos
en el Cretácico de Argentina; pp. 173-179 in Díaz-Martínez, E. and Rábano,
I. (eds.), 4th European Meeting on the Palaeontology and Stratigraphy of
Latin America. Instituto Geológico y Minero da España, Madrid.
González Riga, B.J., Calvo, J.O., and Porfiri, J. 2007. An articulated
titanosaur from Patagonia (Argentina): new evidence of neosauropod pedal
evolution. Palaeoworld. doi: 10.1016/j.palwor.2007.08.003.
ABSTRACT: Most titanosaur dinosaurs are represented by incomplete skeletal
elements lacking articulated pes. An exceptionally preserved specimen from
the Late Campanian?Early Maastrichtian strata of Patagonia (Argentina)
provides new data on pedal morphology and the evolutionary trends of these
huge dinosaurs. This finding is one of the few articulated titanosaur pes
known in the world, and shows a phalangeal formula of 2-2-2-2-0. The first
three digits possess sickle-shaped claws and the articular facets of ungual
phalanges, suggesting mobility in horizontal and vertical planes. A
comparative analysis of available record suggests that titanosaurs had a
progressive reduction of size and number of pedal phalanges in digits III
and IV during the Late Cretaceous.
de la Fuente, M.S., Salgado, L., Albino, A., Báez, A.M., Bonaparte, J.F.,
Calvo, J.O., Chiappe, L.M., Codorniú, L., Coria, R.A., Gasparini, Z.,
González Riga, B.J., Novas, F.E., and Pol, D. 2007. Tetrápodos continentales
del Cretácico de la Argentina: una síntesis actualizada.
ABSTRACT: The Argentinean territory has the most extensive and informative
record of tetrapods of the South Hemisphere. The increase of finds produced
in recent years has permitted to devise an adequate systematic framework to
reinterpret the evolution of the faunas during more than 70 million years.
In this work, an updated synthesis of the knowledge about the continental
tetrapod fauna from the Cretaceous of Argentina is presented, based on the
record of anurans, turtles, lepidosaurs, crocodiles, pterosaurs, dinosaurs,
Schoch, R.R. 2008. A new stereospondyl from the German Middle Triassic, and
the origin of the Metoposauridae. Zoological Journal of the Linnean Society
152(1):79-113. doi: 10.1111/j.1096-3642.2007.00363.x.
ABSTRACT: Recent finds of well-preserved temnospondyl skeletons from the
Lower Keuper (Ladinian, Middle Triassic) in southern Germany are assigned to
a new genus and species, Callistomordax kugleri. This taxon is characterized
by the following autapomorphies: (1) wide unpaired frontal; (2) vomerine
fangs greatly enlarged to occupy entire width of element; (3) intercentra
elongated and massive, anterior face being convex; (4) humerus semilunar
with enlarged deltopectoral crest; (5) cleithrum strongly curved and
bow-shaped; (6) trunk extremely elongated to reach three times the length of
the skull. Callistomordax shares with the Metoposauridae the pattern of
dermal ornamentation, the proportion of both posterior skull table and
snout, the position of the lacrimal, the morphology of the basicranial
region, and the structure of the clavicle and interclavicle. Phylogenetic
analysis suggests Callistomordax to be the sister taxon of the
Metoposauridae, nested within a grade formed by various trematosaurian taxa.
In this assemblage, Lyrocephaliscus and a clade formed by Almasaurus,
Rileymillerus, Callistomordax, and the Metoposauridae are sister taxa. In
all variants of the cladistic analysis, Callistomordax and the
Metoposauridae form immediate sister groups. According to the present
findings, neither plagiosaurids nor brachyopoids and rhytidosteids are
closely related to this ?trematosaurian? monophylum, although these taxa
share a range of homoplasies.
Witzmann, F., and Gassner, T. 2008. Metoposaurid and mastodonsaurid
stereospondyls from the Triassic - Jurassic boundary of Portugal.
Alcheringa. doi: 10.1080/03115510701757316.
ABSTRACT: Remains of stereospondyl amphibians from the Triassic - Jurassic
boundary of the Algarve, southern Portugal, are described for the first
time. They consist of several intercentra of different sizes, ribs and
fragments of the scapular girdle and the skull. The opisthocoelous
morphology of some of the disc-like intercentra and the presence of a
lateral flange on the clavicle indicate that parts of the material can be
referred unambiguously to metoposaurid stereospondyls, representing the
first evidence of this group from the Iberian Peninsula. Several other
disc-like intercentra that are amphicoelous and thinner than those of the
metoposaurids can be referred to mastodonsaurid stereospondyls (either
Mastodonsaurus or Cyclotosaurus). The fossil locality is situated in a
palaeorift system that linked the known metoposaurid localities in eastern
North America, Morocco, and Central Europe.
Hone, D.W.E., and Benton, M.J. 2008. A new genus of rhynchosaur from the
Middle Triassic of south-west England. Palaeontology 51(1):95-115. doi:
ABSTRACT: We present a description of new cranial and postcranial material
representing a new genus of rhynchosaur (Diapsida, Archosauromorpha) from
the Otter Sandstone Formation (Mid Triassic) of Devon, south-west England.
The taxon had been named Rhynchosaurus spenceri Benton, 1990, but cladistic
analysis of the clade, and one autapomorphy, show that it does not belong to
Rhynchosaurus, and a new generic name is required. We propose the name
Fodonyx for this genus. A cladistic analysis of the Rhynchosauria confirms
the main discoveries of previous analyses, and that Fodonyx is sister group
to the Hyperodapedontinae, the clade of Late Triassic rhynchosaurs. The new
cladistic analysis, for which many more characters were coded for Fodonyx
than before (a rise from 39 to 75 per cent), counter-intuitively produced
less well-resolved results: the new codings of previously uncoded characters
introduced conflict so that Fodonyx turns out to be less like the Late
Triassic rhynchosaur clade than had been assumed before.
Varban, B.L., and Plint, A.G. 2008. Palaeoenvironments, palaeogeography, and
physiography of a large, shallow, muddy ramp: Late Cenomanian-Turonian
Kaskapau Formation, Western Canada foreland basin. Sedimentology
55(1):201-233. doi: 10.1111/j.1365-3091.2007.00902.x.
ABSTRACT: The Kaskapau Formation spans Late Cenomanian to Middle Turonian
time and was deposited on a low-gradient, shallow, storm-dominated muddy
ramp. Dense well log control, coupled with exposure on both proximal and
distal margins of the basin allows mapping of sedimentary facies over about
35 000 km2. The studied portion of the Kaskapau Formation is a
mudstone-dominated wedge that thins from 700 m in the proximal foredeep to
50 m near the forebulge about 300 km distant. Regional flooding surfaces
permit mapping of 28 allomembers, each of which represent an average of ca
125 kyr. More than 200 km from shore, calcareous silty claystone
predominates, whereas 100 to 200 km offshore, mudstone and siltstone
predominate. From about 30 to 100 km offshore, centimetre-bedded very fine
sandstone and mudstone record along-shelf (SSE)-directed storm-generated
geostrophic flows. Five to thirty kilometres from shore, decimetre-bedded
hummocky cross-stratified fine sandstone and mudstone record strongly
oscillatory, wave-dominated flows whereas some gutter casts indicate
shore-oblique, apparently mostly unidirectional geostrophic flows. Nearshore
facies are dominated by swaley cross-stratified or intensely bioturbated
clean fine sandstone, interpreted as recording, respectively, areas strongly
and weakly affected by discharge from distributary mouths. Shoreface
sandstones grade locally into river-mouth conglomerates and sandstones,
including conglomerate channel-fills up to 15 m thick. Locally, brackish
lagoonal shelly mudstones are present on the extreme western margin of the
There is no evidence for clinoform stratification, which indicates that
the Kaskapau sea floor had extremely low relief, lacked a shelf-slope break,
and was probably nowhere more than a few tens of metres deep. The absence of
clinoforms probably indicates a long-term balance between rates of
accommodation and sediment supply. Mud is interpreted to have been
transported >250 km offshore in a sea-bed nepheloid layer, repeatedly
re-suspended by storms. Fine-grained sediment accumulated up to a ?mud
accommodation envelope?, perhaps only 20 to 40 m deep. Continuous re-working
of the sea floor by storms ensured that excess sediment was redistributed
away from areas that had filled to the ?accommodation envelope?, being
deposited in areas of higher accommodation further down the transport path.
The facies distributions and stratal geometry of the Kaskapau shelf strongly
suggest that sedimentary facies, especially grain-size, were related to
distance from shore, not to water depth. As a result, the ?100 to >300 m?
depth interpreted from calcareous claystone facies for the more central
parts of the Interior Seaway, might be a significant overestimate.
Cleveland, D.M., Nordt, L.C., and Atchley, S.C. 2008. Paleosols, trace
fossils, and precipitation estimates of the uppermost Triassic strata in
northern New Mexico. Palaeogeography, Palaeoclimatology, Palaeoecology
257(4):421-444. doi: 10.1016/j.palaeo.2007.09.023.
ABSTRACT: This study provides a detailed pedogenic evaluation of two Upper
Triassic (Late Norian through Rhaetian) stratigraphic intervals in New
Mexico in order to assess the climate and ecology of the Latest Triassic,
which ended in a mass extinction. The two study areas are located in
north?central and east-central New Mexico and are separated by 200 km. Each
section contains abundant paleosols of varying maturity with features that
reflect an arid to semiarid climate. There is little pedogenic variation
throughout the strata at each location, and a typical paleosol profile is
about 1 m thick and has an AB?Bw?Bk?BC horizon succession. Bkm, Bss, Bssk,
or Bssg horizons are present in some paleosols. Micromorphological features
suggest dominantly well-drained sola (e.g., abundant carbonate nodules,
illuviated clay) with minor periods of moist or saturated conditions (e.g.,
FeMn concretions, FeMn coatings and hypocoatings, sepic-plasmic fabrics).
Trace fossils are abundant in these strata and are dominated by Taenidium
serpentinum and root traces. Depth-to-carbonate functions estimate that mean
annual precipitation was between 200 and 450 +/- 95 mm. Relative to location
1 (eastern New Mexico), location 2 (north?central New Mexico) produced
higher paleo-precipitation estimates and has stronger and more abundant
sepic-plasmic fabrics in thin sections. The presence of a gleyed paleosol,
Camborygma eumnkenomos, and slickensides at location 2 also suggests
conditions wetter than at location 1. Taxonomically, all of the paleosols in
this study appear to be Entisols or Aridisols and can be grouped into seven
representative pedotypes of varying maturity. By comparing these paleosols
to modern soils, this study demonstrates that the Late Triassic Western
Interior during the Late Norian to Rhaetian was arid to semiarid and
supported a desert shrub environment that had localized and periodic moist
or saturated soil conditions.
Jerry D. Harris
Director of Paleontology
Dixie State College
225 South 700 East
St. George, UT 84770 USA
Phone: (435) 652-7758
Fax: (435) 656-4022
"There's a saying that goes 'people who live in glass houses shouldn't throw
stones'... OK. How about...NOBODY should throw stones. That's crappy
behavior! My policy is 'no stone-throwing regardless of housing situation.'
There's an exception, though. If you're TRAPPED in a glass house...and you
have a stone, then throw it! What are you, an idiot? It's really 'ONLY
people in glass houses should throw stones'... provided they're trapped, in
a house... with a stone. It's a little longer, but you know..."
--- Demetri Martin