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[dinosaur] Saurolophus bonebed from Nemegt Formation, Mongolia + Korean vertebrate fossils + Brazil fossils





Ben Creisler
bcreisler@gmail.com

Some not so recent papers not yet mentioned:


Somehow missed last month...


P.R. Bell, D.C. Evans, D.A. Eberth, F. Fanti, Kh. Tsogtbaatar & M.J. Ryan (2017)
Sedimentological and taphonomic observations on the âDragon's Tombâ Saurolophus (Hadrosauridae) bonebed, Nemegt Formation (Upper Cretaceous), Mongolia.
Palaeogeography, Palaeoclimatology, Palaeoecology (advance online publication)
doi:Â https://doi.org/10.1016/j.palaeo.2017.11.034
http://www.sciencedirect.com/science/article/pii/S0031018217307150

Highlights

Sedimentology and taphonomy of the Dragonâs Tomb Saurolophus bonebed is documented.
Fossils were deposited in the thalweg of a meandering paleochannel under a variety of high and lower energy flow conditions.
The site is a monodominant bonebed with at least three size classes (juvenile, subadult, and large adult) of Saurolophus.
Provides evidence for a catastrophic mass death of Saurolophus and the first record of gregariousness behavior in this genus.

Abstract

The famous âDragon's Tombâ Saurolophus bonebed at Altan Uul II preserves multiple complete skeletons with skin impressions, and is exceptional among Nemegt Formation dinosaur localities as the only mass accumulation of articulated individuals. Here, we present results from an on-going paleontological project focused on the Baruungoyot-Nemegt succession in order to document this unique locality. Sedimentological data allow us to confirm that the fossils and host sediments were deposited in the thalweg of a meandering paleochannel that experienced a variety of high and lower energy flow conditions. A variety of taphonomic data were collected from exposed fossils, including those displaced by poaching. Three-dimensional maps of the host sediments and fossils were generated, and 13 m2 of exposed, in-situ bones were mapped. Previously undocumented portions of at least 13 additional Saurolophus individuals and a partial subadult Tarbosaurus skeleton were identified. The Dragon's Tomb is a monodominant bonebed with at least three size classes (juvenile, subadult, and large adult) of Saurolophus preserved. The bonebed has a minimum size of ~ 2000 m2, suggesting that over 100 Saurolophus carcasses may have contributed to the thanatocoenose. Although the data provide evidence for a catastrophic mass death of a social group of Saurolophus and provide the first evidence of gregariousness in this taxon, the cause of death cannot be determined.




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Seung Choi & Yuong-Nam Lee (2017)
A review of vertebrate body fossils from the Korean Peninsula and perspectives.
Geosciences Journal 21(6): 867â889Â
DOI: https://doi.org/10.1007/s12303-017-0040-6ÂÂ
https://link.springer.com/article/10.1007/s12303-017-0040-6



For the first time, a comprehensive review was presented for all Korean vertebrate body fossils reported during last 100 years. At present, Korean vertebrate faunas are characterized by no fossil report in the Paleozoic, various Cretaceous terrestrial vertebrates, and the Late Eocene to Middle Miocene mammals. Except for the old collection of land mammals of North Korea, most fossils have been found and published during the last three decades in South Korea. They are commonly incomplete and fragmentary. Articulated skeletons are rare except for fish fossils. Cretaceous vertebrate faunas include six freshwater fish orders (including Jinjuichthys cheongi), two families of turtles, an anguimorph lizard (Asprosaurus bibongriensis), a crocodyliform (âHadongsuchus acerdentisâ), an anurognathid pterosaur, various theropod remains including three kinds of birds, titanosauriform remains, a basal ornithopod (Koreanosaurus boseongensis), and a basal neoceratopsian (Koreaceratops hwaseongensis). Among them, pterosaur and bird specimens from the Sinuiju Series of North Korea have not been described in detail yet, but their fossil assemblages are very similar to those of Jehol Biota of northeastern China. A possibility of the faunal connection is discussed between two regions. Unfortunately, no additional mammal fossil has been reported from North Korea since two important land mammal localities were discovered in the late Eocene and early Miocene strata before 1943. However, new rodent and cetacean fossils were found in both terrestrial and marine Miocene strata in South Korea. Most of the valid vertebrate taxa appear to be endemic in Korea, but some clades show faunal affinities with Mongolia, China, and Japan. However, detailed faunal comparisons have not been performed among these countries. Vertebrate paleontological data of the Korean Peninsula have been rapidly accumulated and become crucial to understand evolutionary dynamics of vertebrates in East Asia. Vertebrate paleontological studies need to focus more on the Paleozoic strata for primitive fishes and early tetrapods, and Cenozoic terrestrial strata for land mammals in Korea. Further work throughout the geologic column will only improve our understanding of the evolution of life in East Asia.

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Free pdf:


Candeiro C. R. A., MendonÃa FigueirÃa S. F., Peyerl D. & De Campos C. (2017)
Railroads in western SÃo Paulo State (Brazil) and the first discoveries of Late Cretaceous fossil vertebrates by naturalists and paleontologists.
Revue de PalÃobiologie 36 (1): 157-167
DOI: 10.5281/zenodo.814105
http://institutions.ville-geneve.ch/fileadmin/user_upload/mhn/documents/Museum/Revue_de_Paleo/157_167_Candeiro_etal.pdf



The first railway companies formed in the SÃo Paulo State during the last decades of the nineteenth century were intended to provide quick and inexpensive transportation to coffee â which was the main agricultural product of the period and had a wide acceptance in the international market. As a result of the construction of railroads, a big quantity fossil materials was discovered; most of them were collected by the workers of the railway companies which then sent the fossils to the ServiÃo GeolÃgico e MineralÃgico do Brasil âSGMB (Geological and Mineralogical Survey of Brazil) in Rio de Janeiro city and to the Paulista Museum in SÃo Paulo city. Therefore, this study aims at providing a brief history of the first studies of Cretaceous vertebrates found in the countryside of the SÃo Paulo State, demonstrating the relationship between these findings with the construction of railroads, and its contribution to the Brazilian paleontological research during this period.



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