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Lotsa New Papers
Hi All -
The latest bunch of stuff, the most "exciting" first:
Zhang, Z., Hou, L., Hasegawa, Y., O'Connor, J., Martin, L.D., and Chiappe,
L.M. 2006. The first Mesozoic heterodactyl bird from China. Acta Geologica
Sinica (English Edition) 80(5):631-635.
Don't get all drooly over this one -- the evidence for heterodactyly is
pretty poor, IMHO. The thing, _Dalingheornis liweii_, does have a rather
longish tail, though, reminiscent of _Liaoxiornis_ (which is supposedly also
matches in size).
Novas, F.E., Ezcurra, M.D., and Agnolin, F.L. 2006. Humerus of a basal
abelisauroid theropod from the Late Cretaceous of Patagonia. Revista del
Museo Argentino de Ciencias Naturales, n.s. 8(1):63-68.
Agnolin, F.L., Novas, F.E., and Lio, G. 2006. Neornithine bird coracoid from
the Upper Cretaceous of Patagonia. Ameghiniana 43(1):245-248.
Coria, R., Currie, P.J., and Carabajal, A.P. 2006. A new abelisauroid
theropod from northwestern Patagonia. Canadian Journal of Earth Sciences
ABSTRACT: The Argentinean record of abelisauroid theropods begins in the
Early Cretaceous (Ligabueino) and spans most of the Late Cretaceous, from
Cenomanian (Ilokelesia, Xenotarsosaurus, and Ekrixinatosaurus) to
Campanian-Maastrichtian (Abelisaurus, Carnotaurus, Aucasaurus, and
Noasaurus). A fragmentary specimen of a theropod dinosaur was collected in
2000 from the middle section of the Lisandro Formation (Turonian?) at Cerro
Bayo Mesa, Neuquén Province, Argentina. The fossil-bearing level, which is
part of the Lisandro Formation that also yielded the remains of the basal
ornithopod Anabisetia saldiviai, corresponds to a reddish, massive mudstone
linked with fluvial channel deposits. The theropod identified as
MCF-PVPH-237 is an abelisauroid theropod that increases our knowledge about
the evolution of South American Abelisauroidea and is the first record of
this clade from the Lisandro Formation.
I don't have this one yet, and so don't know what, if anything, is the
name of this new beast.
Candeiro, C.R.A., and Martinelli, A.G. 2006. A review of paleogeographical
and chronostratigraphical distribution of mesoeucrocodylian species from the
upper Cretaceous beds from the Bauru (Brazil) and Neuquén (Argentina)
groups, southern South America. Journal of South American Earth Sciences
22(1-2):116-129. doi: 10.1016/j.jsames.2006.08.001.
ABSTRACT: This article offers a detailed overview of mesoeucrocodylian
assemblages recovered from the Late Cretaceous southern South America Bauru
and Neuquén groups as a result of extensive research during the past 110
years. The Bauru (Brazil) and Neuquén (Argentina) groups yield numerous
mesoeucrocodylian remains, mainly of Turonian-late Maastrichtian (Late
Cretaceous) age. The majority of the discoveries were made in the Adamantina
and Marília formations of Minas Gerais and São Paulo states, Brazil, and
Candeleros and Bajo de la Carpa formations of Neuquén and Río Negro
provinces, Argentina. Sixty formally described species of mesoeucrocodylians
are recognized on the basis of disarticulated materials; among them,
notosuchians, sebecosuchians, and peirosaurids are the best represented. At
least one species is common to the Bauru and Neuquén groups, and close
phylogenetic affinities are postulated for the remaining taxa. The fossil
record of these two South American units shows three main peaks of
diversity: in the Cenomanian of Argentina, the Santonian of Argentina and
Brazil, and the Maastrichtian of Brazil. The absence of notosuchians and
sebecosuchians in the late Campanian-Maastrichtian of Patagonia is
coincident with the paleoenvironmental changes in that landmass by that
time, as well as with the increase in diversity of several groups of
theropod dinosaurs. In contrast, highly specialized carnivorous
mesoeucrocodylians are abundant in the Maastrichtian of the Bauru group of
Brazil, whereas other tetrapod carnivorous groups are scarcely represented.
Jiang, B., and Sha, J. 2006. Late Mesozoic stratigraphy in western Liaoning,
China: a review. Journal of Asian Earth Sciences 28(4-6):205-217. doi:
ABSTRACT: Based on progress in stratigraphic and paleontological studies, we
discuss the subdivision of Late Mesozoic strata in western Liaoning,
focusing on the controversies surrounding the relationship of the Jiufotang
and Shahai formations, and whether or not the Zhanglaogongtun and Banlashan
formations exist as distinct lithologic units. We describe the Late Mesozoic
strata at representative sections associated with the new discoveries. We
also discuss the correlation of Late Mesozoic strata between western
Liaoning and eastern Heilongjiang and their implications for the ages of the
strata in Liaoning.
Among other things, one important tidbit in here: the Shahai and
Jiufotang formations look like lateral equivalents, not successive units.
Paik, I.S., Huh, M., Park, K.H., Hwang, K.G., Kim, K.S., and Kim, H.J. 2006.
Yeosu dinosaur track sites of Korea: the youngest dinosaur track records in
Asia. Journal of Asian Earth Sciences 28(4-6):457-468. doi:
ABSTRACT: Eighty two dinosaur trackways were newly discovered in Upper
Cretaceous lacustrine deposits on islands in the vicinity of Yeosu, Korea.
Most dinosaur tracks occur in marginal lake deposits with polygonal
desiccation cracks. The dinosaur tracks at the Yeosu site include 65
ornithopod trackways, 16 theropod trackways and one sauropod trackway. The
prevalence of ornithopod tracks and the limited occurrence of sauropod
tracks at the Yeosu site evidently reflect decreased sauropod diversity in
the Upper Cretaceous. All ornithopod trackways represent bipeds, and most of
the ornithopod tracks are similar to Caririchnium from other sites of the
Korean peninsula. All fossil wood specimens collected in the study area
represent conifers (three species of cupressaceous and two species of
taxodiaceous conifers, and a new species) except for one, which is a
discotyledon. It is thus inferred that the southwestern part of the Korean
Peninsula was primarily covered with mesic forests with taxodiaceous trees
during the Late Cretaceous. The K-Ar age of the Yeosu tracksite is
determined as 81-65 Ma (Camapnian to Maastrichtian). It indicates that the
Yeosu track site contains the last records of dinosaurs living in Asia.
Consequently, semi-arid palaeoclimatic conditions, together with a large
lake as a persistent water source and rich vegetation of gymnosperm trees as
food, resulted in the preservation of abundant dinosaur tracks in the Upper
Cretaceous on the Korean Peninsula.
Jouve, S., Iarochene, M., Bouya, B., and Amaghzaz, M. 2006. New material of
Argochampsa krebsi (Crocodylia: Gavialoidea) from the Lower Paleocene of the
Oulad Abdoun Basin (Morocco): phylogenetic implications. Geobios
39(6):817-832. doi: 10.1016/j.geobios.2005.07.003.
ABSTRACT: New material from the Lower Paleocene of the Oulad Abdoun Basin,
Morocco, including postcranial material permits a new description of
Argochampsa krebsi. The odontoid process of the axis bears a strong lateral
apophysis, continuous on the anterolateral margin of the centrum. This
process has never been observed such developed in other crocodylians. The
single preserved posterior cervical vertebra exhibits a particularly short
neural spine, much shorter than that is observed in Alligator
mississippiensis, Crocodylus porosus, and Gavialis gangeticus. A
phylogenetic analysis, including new coding of A. krebsi, provide a result
that is globally congruent with previous works, but differs significantly in
the relationships of the gavialoids. A. krebsi is more closely related to G.
gangeticus than is Eogavialis africanum. The South American Ikanogavialis
gameroi and Gryposuchus colombianus form a polytomy, and are more closely
related to G. gangeticus than is Piscogavialis jugaliperforatus, a gavialoid
from Peru. The South American gavialoids may thus not be monophyletic. This
result may indicate, contrary to previous result, a more complex
paleobiogeographic history. Thus, a multiple invasion of South America by
gavialoids from Africa is equally parsimonious with a single invasion, and
an invasion from South American to Asia is equally parsimonious with an
invasion from Africa.
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
"Trying to estimate the divergence times
of fungal, algal or prokaryotic groups on
the basis of a partial reptilian fossil and
protein sequences from mice and humans
is like trying to decipher Demotic Egyptian with
the help of an odometer and the Oxford
-- D. Graur & W. Martin (_Trends
in Genetics_ 20, 2004)