Ben Creisler
Some recent dino and Mesozoic papers (mainly for Spain and Portugal)
with free pdfs
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Not yet mentioned...
E. Malafaia, J. M. Gasulla, F. Escaso, I. NarvaÃz & F. Ortega (2020)
An update of the spinosaurid (Dinosauria: Theropoda) fossil record from the Lower Cretaceous of the Iberian Peninsula: distribution, diversity, and evolutionary history.
Journal of Iberian Geology 46(4): 431 - 444
doi:
https://doi.org/10.1007/s41513-020-00138-9https://link.springer.com/article/10.1007/s41513-020-00138-9Free pdf:
https://link.springer.com/content/pdf/10.1007/s41513-020-00138-9.pdfÂ======
Carlos de Miguel Chaves, Francisco Ortega & AdÃn PÃrez-GarcÃa (2020)
The Iberian Triassic fossil record of Sauropterygia: an update.
Journal of Iberian Geology 46(4): 445 - 464
DOI:
https://doi.org/10.1007/s41513-020-00137-whttps://link.springer.com/article/10.1007/s41513-020-00137-wFree pdf:
https://link.springer.com/content/pdf/10.1007/s41513-020-00137-w.pdf===
Angelica Torices, Josà M. Valle MelÃn, GarbiÃe Elorriaga Aguirre, Pablo Navarro LorbÃs & Ãlvaro RodrÃguez Miranda (2020)
Multiscale geometric 3D recording of palaeontological heritage in La Rioja (Spain): regional context, sites, tracks and individual fossils.
Journal of Iberian Geology 46(4): 465 â 474
DOI:
https://doi.org/10.1007/s41513-020-00132-1https://link.springer.com/article/10.1007/s41513-020-00132-1Free pdf:
https://link.springer.com/content/pdf/10.1007/s41513-020-00132-1.pdf====
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New issue of Âopen access Boletim do Centro PortuguÃs de Geo-HistÃria e PrÃ-HistÃria
https://www.cpgp.pt/boletim.phpContents:
https://www.cpgp.pt/pdf/BoletimCPGP-V2N1-2020.pdf***
Of dinosaur interest (free pdfs):
A new site with dinosaur tracks is described from the middle Oxfordian from PedrÃgÃo beach. Presenting in general low preservational conditions, the stratigraphic level from CabaÃos Formation shows, however, some tridactyl medium-to-giant size tracks, attributed to Megalosauripus and other morphotype with high angles of divarication between digits. Megalosauripus are compared with the large theropod tracks of Cabo Mondego, the only ichnological site dated from the Oxfordian until now known in Portugal.
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SilvÃrio D. Figueiredo, Xabier Pereda-Suberbiola, Pedro P. Cunha, Fernanda Sousa & Pierluigi Rosina (2020)
A brief approach about the ornithopods dinosaurs from the Papo-Seco Formation (Cabo Espichel, western central Portugal).
Boletim do Centro PortuguÃs de Geo-HistÃria e PrÃ-HistÃria 2(1): Â59-63
https://www.cpgp.pt/boletim/Artigos-Boletim-V2-N1/Figueiredo-S_etal_2020_59-63_BCPGPV2N1.pdf
New ornithopod remains are reported from the Papo-Seco Formation (Lower Barremian, Lower Cretaceous) at the Espichel Cape, western central Portugal, south of Lisboa. Marine, lagoonal and estuarine sedimentary rocks, consisting in limestones, marls, sandstones and conglomerates, have yielded fossil remains of dinosaurs and other vertebrates since the 19th century. Recent field work has found new vertebrate remains, including turtle shell fragments and isolated crocodilian teeth, fish bones and pterosaurs. Bones and teeth of large ornithopod dinosaurs have also been identified. These new discoveries are an important contribution to the knowledge of the ornithopod diversity from the Portuguese Cretaceous.
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Short items (no abstracts) in Portuguese:
Determining the location of the Cretaceous-Paleogene (K-Pg) boundary in terrestrial strata is highly significant for studying the evolution of terrestrial ecosystems at the end of the Cretaceous (especially the extinction of non-avian dinosaurs). At present, research on terrestrial K-Pg boundaries worldwide is concentrated in the middle and high latitudes, such as North America and Northeast China. Although many studies have also been carried out in the Nanxiong Basin, located at low latitudes (which has become the standard for dividing and comparing the continental K-Pg stratigraphy in China), many researchers have proposed four possible boundaries from different perspectives. Therefore, the exact location remains to be determined. In this study, the total mercury (Hg) content, environmental magnetism, geochemistry, and other parameters for the samples collected near the four boundaries were determined and compared with existing records. Results indicated that: 1) The total Hg content significantly increased in the upper part of the Zhenshui Formation and Pingling part of the Shanghu Formation with sharp fluctuations. As per latest dating results of Deccan Traps, the significantly high Hg value was attributed to the Deccan Traps eruption. Boundary 1 was located in the middle of the Hg anomaly interval, which was consistent with the relationship between the global K-Pg boundary and time of volcanic eruption. 2) The reconstructed paleoclimate evolution curve revealed that the red sediments in the basin recorded the late Maastrichtian warming event (66.2 Ma). Regarding the relationship between the four boundaries and this warming event, only boundary 1 was found to be closest to the real K-Pg boundary of the Nanxiong Basin.
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A recent article describes minute insects that are on or close to two feathers in two pieces of mid-Cretaceous (100 Ma) amber from Myanmar, and states that evidence "strongly suggest[s] that Mesophthirus is ectoparasitic". The feathers are presumably from stem-group, feathered avialan dinosaurs. Despite the abundance of feathers in Burmese amber and even the rare occurrence of nestling pennaraptorans, ticks have been the only ectoparasites found thus far in Burmese amber.
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How do we explain the presence of the coccoids on the feathers and the putative feeding traces? This is damage that could have been made by anything. If the feathers had shed on the ground or in a nest they could have been consumed by larval dermestid beetles, which today are ubiquitous in and around bird and mammal nests feeding on keratinous debris, and which we know occurred at least by this time period.
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Coccoids are never ectoparasitic, since the fine mouthparts could never penetrate and draw up tough, dry keratin. Given the abundance of coccoids generally in amber deposits around the world and the abundance of feathers specifically in Burmese amber, a coincidental cooccurrence of the two is quite probable.
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