10.6084/m9.figshare.3454649.v1
Vincent Fernandez
Vincent
Fernandez
Julien Claude
Julien
Claude
Gilles Escarguel
Gilles
Escarguel
Eric Buffetaut
Eric
Buffetaut
Varavudh Suteethorn
Varavudh
Suteethorn
Biogeographical affinities of Jurassic and Cretaceous continental vertebrate assemblages from SE Asia
Geological Society of London
2016
Jurassic
SE Asia
Cretaceous
faunal assemblages
RFA
formation
94 Regional Faunal Assemblages
Sao Khua Formation
Geology
2016-06-21 12:15:54
Journal contribution
https://geolsoc.figshare.com/articles/journal_contribution/Biogeographical_affinities_of_Jurassic_and_Cretaceous_continental_vertebrate_assemblages_from_SE_Asia/3454649
<p>Over the last 25 years, rich vertebrate assemblages have been discovered in three distinct formations of the Late Jurassic
and Early Cretaceous of Thailand. This work aims to compare the taxonomic assemblages of SE Asia within their palaeogeographical
context in Asia. Occurrences of 477 taxa in 94 Regional Faunal Assemblages (RFA) have provided the raw material for producing
a dissimilarity matrix based on the Raup & Crick index. These distances have been investigated statistically to infer relationships
between the diverse faunal assemblages in space and time. Our results show that the Thai formations are more similar to each
other than to any other formations, suggesting a strong provincialism. The relationship of SE Asian RFAs with other Asian
RFAs is more influenced by the presence of freshwater or near-shore taxa than by strictly terrestrial ones. Our analysis shows
that the faunal interchange between RFAs was rather low from the Late Jurassic to the end of the Early Cretaceous. However,
faunal dispersals dramatically decreased during the mid-Early Cretaceous in Asia. The faunas show an overall stronger provincialism
during the mid-Early Cretaceous, indicating the role of possible geographical barriers. This event is characterized by the
absence of ornithischian dinosaurs in the Sao Khua Formation although they are present in the under- and overlying formations.
Taxonomic diversity and exchanges between faunal assemblages recovered rapidly as early as the Aptian in Asia, but the fauna
of SE Asia still retained a strong biogeographical signature.
</p>