[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Australian dinosaur tracks and other news

From: Ben Creisler

A number of recent news stories:

Australian "Cretaceous Park" dinosaur tracks at Kimberley revealed



Mary Schweitzer interview on dinosaur tissues


Tylosaurus and Pteranodon now official state fossils of Kansas


Crocodile anatomy as insight into dinosaurs



French cartoon adventures of ornithomimosaur from Charente continue (in French)


Tyrannosaurus from Mexico (in Spanish)


Feathered dinosaurs (in German)



Fossil plants reveal warmer climate for Winton Formation dinosaurs in Australia



Tamara L. Fletcher, Patrick T. Moss and Steven W. Salisbury (2014)
Foliar physiognomic climate estimates for the Late Cretaceous
(Cenomanian-Turonian) Lark Quarry fossil flora, central-western
Queensland, Australia.
Australian Journal of Botany 61(8) 575-582
doi:  http://dx.doi.org/10.1071/BT13197

Although there is a broad knowledge of Cretaceous climate on a global
scale, quantitative climate estimates for terrestrial localities are
limited. One source of terrestrial palaeoproxies is foliar
physiognomy. The use of foliar physiognomy to explore Cretaceous
assemblages has been limited, and some of its potential sources of
error have not been fully explored. Although museum collections house
a wealth of material, collection bias toward particular taxa or
preservation qualities of specimens further magnifies existing
taphonomic bias to cold temperatures. As a result, specific collection
for foliar physiognomy can be necessary. Here, we conduct three foliar
physiognomic analyses on the early Late Cretaceous Lark Quarry flora
and assess the results in the context of other proxies from the same
formation. Our results suggest that the climate at the
Cenomanian-Turonian boundary in central western Queensland was warm
and had high precipitation (leaf-area analysis: 1321 mm + 413 mm - 315
mm mean annual precipitation; leaf-margin analysis: 16.4°C mean annual
temperature, 5.3°C binomial sample error; climate leaf-analysis
multivariate program: 16 ± 2°C for mean annual temperature, 9-month
growth season, 1073 ± 483 mm growth-season precipitation). Our
analysis also gave higher mean annual temperature estimates than did a
previous analysis by climate leaf-analysis multivariate program, based
on museum collections for the Winton Formation.