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Found 44 results

  1. New Abelisaurid from Argentina

    Looks like Abelisaurid week in south america A new Abelisaurid is described here from the late Cretaceous of Argentina : Niebla antiqua For those collectors that have abelisaurid teeth from Argentina this species just adds to the complexity in trying to identify isolated teeth unfortunately its paywalled https://www.sciencedirect.com/science/article/abs/pii/S0895981120304582 Got some better photos
  2. South America’s Missing Megafauna

    What Happened to South America’s Missing Mega-Mammals, Trilobites, New York Times. Related papers Marshall, L.G., 1988. Land mammals and the Great American interchange. American Scientist, 76(4), pp.380-388. MacFadden, B.J., Hulbert, R.C. and Baskin, J.A., 2007. Revised age of the late Neogene terror bird (Titanis) in North America during the Great American Interchange. Geology, 35(2), pp.123-126. Dr. Richard C. Hulbert - More papers Bruce J. MacFadden - More papers Baskin, J.A. and Thomas, R.G., 2007. South Texas and the Great American interchange. Gulf Coast Association of Geological Socities. 57, pp. 37-45. Yours, Paul H.
  3. Hello, Folks, New to the Forum. I am currently going through the collection in an attempt to systematise it and catalogue it properly before I pop my clogs. I came across this ammonite which I purchased online some time ago. All it had with it was South America Cretaceous, which is a start, I guess. Can anyone please help with possible provenance and id? It appears to be preserved in some sort of black and white calcite, and it occurred to me that it might be from Peru, but I could not find anything like it in any searches. I will attempt to describe it - apologies for any poor use of nomenclature. It has a series of well-defined ribs which bifurcate before they cross the venter. There is no keel and there appear to be four maybe five constrictions per whorl. There are occasional secondary ribs which fade out about a third of the way down the flank. I hope the photos are of more help. Any help much appreciated. Regards, Hamish
  4. Fossil? Please help

    Hi everyone, this is another find from south america. Does it look like a fossil? In one of the pictures there is a protuberance which makes me think so but I am no expert. Thank you all for your insights,
  5. Dear Experts and Collectors- I am new to your group and I have limited experience with fossils. I have a large number of fossils I have inherited recently and am trying to get identification of the fossils- I have been advised that most of these are from South America. Can someone help with identification and other relevant information? I can also send additional photos if needed. The coin in the photos measures 1.5cm in diameter for scale. This is just a small sampling of the larger collection and I thought I could start with these. Thanks, Scott fossil 1.jfif fossil 2.jfif fossil 3.jfif fossil 4.jfif fossil 5.jfif fossil 6a & 6b.jfif
  6. Interesting discovery of a new theropod in South America: Overoraptor Chimentoi. Thought to be closely related to 'Rahonavis' from Madagascar; “...........would indicate that Overoraptor chimentoi and Rahonavis could form a new group of paravian runners, which would be closer to the birds than known raptor families.” http://www.sci-news.com/paleontology/overoraptor-chimentoi-08517.html
  7. Looks like scientists from Buenos Aires have discovered the remains of a new species of megaraptor from the late Cretaceous. Discovered in the southwest province of Santa Cruz. http://www.ctys.com.ar/index.php?idPage=20&idArticulo=4011
  8. Monkeys arrived to S America by Raft

    Here is an interesting article that suggests that monkeys arrived to the New World via raft from Africa. A very ironic photo occurs right below the article title. Either the editor was not paying attention or they were having some fun. https://www.cnn.com/2020/04/09/world/prehistoric-monkeys-crossed-atlantic-scn/index.html
  9. revista espanola de Paleontologia,extra/1992 Un cas remarkable d'epigenie chez une notanopliide(chonetacea,Brachiopoda) du Devonien de Bolivie epigenieaberradevonidiagenesrevesp(biomintapho)bolivamericatapho18. bRacheboeuf.pdf First off the bat:THIS deserves to be read A:burial in the sediment B:replacement of the secondary calcite layer by silica C: dissolution of carbonate of the secondary layer(NOT recrystallized),formation of clay minerals D: final state:dissolution of the external mould of both valves Selective,rapid centripetal diagenesis NB: spiriferids in the same concretion nearby do NOT show this form of preservation morphology: the decalcified specimens are SMALL and have a thick shell
  10. it's what you wear

    Tooth wear and microwear of theropods from the Late Maastrichtian Marılia Formation (Bauru Group), Minas Gerais State, Brazil Carlos Roberto A. Candeiro, Philip J. Currie, Caio L. Candeiro and Lılian P. Bergqvist Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 106, 229–233, 2017 candeircurriedinosaattriboldentittooth_wearcretac_theropods_maastrichtianmminasgeraisbrazil.pdf
  11. Jung, P., Baumann, K., et al. (2020). Desert breath—How fog promotes a novel type of soil biocenosis, forming the coastal Atacama Desert’s living skin. Geobiology 18:113–124. PDF Of interest to those who study/like to know more about: - the varied ways in which Earth's biota influences/can influence the surface of our planet - exobiology - Precambrian geology - soil formation and preservation - the interaction between edaphic (geomorphology,precipitation)factors and microbiota - geomorphology - the global carbon and nitrogen cycle - ecosystem formation Skippables: page 114 to part of page 117 are mostly methodological(although I found the remote sensing part interesting) wraasamolovJungbendix_al-aridesatacamericabsol2020Geobiology.pdf
  12. Hello, this was from my grandfather, and I was never able to figure out what it really is. It was found in São Gabriel, Rio Grande do Sul, to the extreme south of Brazil. I particularly think this has an organic appearance, which is why I came to ask for help identifying what might be (I apologize for the quality of the photos and the macro) Size: 15cm x 9,5 cm
  13. These are among the first comma shrimp fossils from 97 million years ago. I didn't even know comma shrimp were a thing. They also found some crabs in this Northern South America site. https://m.phys.org/news/2019-11-world-oldest-comma-shrimp.html
  14. DKNC-002 Carcharodon carcharias (Sacaco)

    From the album Elasmobranchs

    TFF DKNC-002 Tooth height is ≈1-3/8 inches (3.5 cm)

    © David Kn.

  15. Fish from Brazil

    Hi. Brand new here. Over 20 years ago I had a Chinese business colleague who traveled regularly to Brazil. He showed me a beautiful piece once when I was visiting him. A while later he brought me this fossil as a gift. I’ve always loved it but know very little about it. I’m sure this is familiar to you guys. Anything you can tell me about it would be deeply appreciated
  16. Gifted Fossils from South America

    Good Day! These fossils were a gift from a friend in the early 1980's. He was a world traveler and brought them to my family from South America. He has since passed so I can't ask him specifics. Clearly they are fish fossils, but that is all I can derive as a layperson. Are there other things that a more skilled person in the field could relay about them? Thank you for the information. The sizes are on the photos: The larger piece is 14.5 x 4.25 x 4 inches The smaller piece is 5.25 x 6.5 x 3.5 inches They are very heavy.
  17. Does anyone have a copy of these papers??? : Javier Párraga; Albert Prieto-Márquez (2019). Pareisactus evrostos, a new basal iguanodontian (Dinosauria: Ornithopoda) from the Upper Cretaceous of southwestern Europe. Zootaxa 4555 (2): 247–258. doi:10.11646/zootaxa.4555.2.5. PMID 30790960. Julian C. G. Junior Silva; Thiago S. Marinho; Agustín G. Martinelli; Max C. Langer (2019). Osteology and systematics of Uberabatitan ribeiroi (Dinosauria; Sauropoda): a Late Cretaceous titanosaur from Minas Gerais, Brazil. Zootaxa. 4577 (3): 401–438. doi:10.11646/zootaxa.4577.3.1. It's quite odd that despite being described as a distinct genus from Rhabdodon, Pareisactus is known only from one skeletal element. Therefore, it is highly probable that some very fragmentary rhabdodontid specimens from France and Spain assigned to Rhabdodon could be from Pareisactus (Matheronodon shows that more than one rhabdodontid lived in Europe during the late Campanian-Maastrichtian interval).
  18. Reconstruction of trilobite ancestral range in the southern hemisphere January 10, 2019, FAPESP https://phys.org/news/2019-01-reconstruction-trilobite-ancestral-range-southern.html http://agencia.fapesp.br/reconstruction-of-trilobite-ancestral-range/29527/ Carbonaro, F.A., Langer, M.C., Nihei, S.S., de Souza Ferreira, G. and Ghilardi, R.P., 2018. Inferring ancestral range reconstruction based on trilobite records: a study-case on Metacryphaeus (Phacopida, Calmoniidae). Scientific reports, 8(1), p.15179. https://www.researchgate.net/publication/328251419_Inferring_ancestral_range_reconstruction_based_on_trilobite_records_a_study-case_on_Metacryphaeus_Phacopida_Calmoniidae https://www.nature.com/articles/s41598-018-33517-5 Bolivian Trilobites - At The Top Of The World American Museum of Natural History https://www.amnh.org/our-research/paleontology/paleontology-faq/trilobite-website/trilobite-localities/bolivian-trilobites-at-the-top-of-the-world Gallery of the Devonian Trilobites of Bolivia https://www.amnh.org/our-research/paleontology/paleontology-faq/trilobite-website/trilobite-localities/bolivian-trilobites-at-the-top-of-the-world/gallery-of-the-devonian-trilobites-of-bolivia Yours, Paul H.
  19. the Cambrian of Argentina

    harrington cambrian1670-1739-1-PB.pdf Horacio J Harrington Paleontologia del Paleozoico inferior de la Argentina I: Las faunas del Cambrico medio de San Juan Revisto del Museo de La Plata,T II,pt 11(Paleontologia) less than 2,5 MB NOTE: in spanish edit: Diacritics omitted
  20. Devonian trilobites of Gondwana studied with newer mathematical models to determine evolutionary connections https://phys.org/news/2019-01-reconstruction-trilobite-ancestral-range-southern.amp
  21. I was looking through some fossils on an auction house website, when I saw some dinosaur eggs labelled as saltasaurus or argentinosaurus. Does anyone have any views on it?
  22. https://phys.org/news/2019-01-fossil-prehistoric-deer-argentina.html
  23. Who are you calling dimorphic

    Parent_1997-Geobios.pdf Ontogeny and Sexual dimorphism of Eurycephalites gottschei(Tornquist)(Ammonoidea) of the Andean Lower Callovian(Argentine-Chile) Geobios 30-3,30-6-1997 recommended? You bet!! Avoid if allergic to quantitative analytic data treatment
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