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Found 14 results

  1. 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
  2. Grand Canyon Paleontology

    Hey y'all, hope you're all having a good time! This recently published report by Hodnett & Elliott (2018) describes two fairly diverse chondrichthyan faunas from the late Mississippian/early Pennsylvanian of western Grand Canyon (Arizona). The assemblages, from 2 separate formations, are described on the basis of quite many tooth specimens, and other material (i.e. denticles). Differences between those faunas and other similar-aged Euro-American faunas indicate paleogeographical implications relating to the formation of Pangaea. Hodnett, J. P. M., & Elliott, D. K. (2018). Carboniferous chondrichthyan assemblages from the Surprise Canyon and Watahomigi formations (latest Mississippian–Early Pennsylvanian) of the western Grand Canyon, Northern Arizona. Journal of Paleontology, 92(S77), 1-33. Abstract: Two chondrichthyan assemblages of Late Mississippian/Early Pennsylvanian age are now recognized from the western Grand Canyon of northern Arizona. The latest Serpukhovian Surprise Canyon Formation has yielded thirty one taxa from teeth and dermal elements, which include members of the Phoebodontiformes, Symmoriiformes, Bransonelliformes, Ctenacanthiformes, Protacrodontoidea, Hybodontiformes, Neoselachii (Anachronistidae), Paraselachii (Gregoriidae, Deeberiidae, Orodontiformes, and Eugeneodontiformes), Petalodontiformes, and Holocephali. The euselachian grade taxa are remarkably diverse with four new taxa recognized here; the Protacrodontidae: Microklomax carrieae new genus new species and Novaculodus billingsleyi new genus new species, and the Anchronistidae: Cooleyella platera new species and Amaradontus santucii new genus new species. The Surprise Canyon assemblage also has the youngest occurrence of the elasmobranch Clairina, previously only known from the Upper Devonian. The Surprise Canyon Formation represents a nearshore fluvial infilling of karstic channels, followed by a shallow marine bioherm reef, and finally deeper open water deposition. The early Bashkirian Watahomigi Formation represents open marine deposition and contains only two taxa: a new xenacanthiform, Hokomata parva new genus new species, and the holocephalan Deltodus. The relationship between the Surprise Canyon and Watahomigi chondrichthyan assemblages and other significant coeval chondrichthyan assemblages suggests that there may have been eastern and western distinctions among the Euamerican assemblages during the Serpukhovian due to geographic separation by the formation of Pangea. Here's the paper Hodnett & Elliott 2018 Grand Canyon chondr. fauna.pdf Happy New Year to you all!! -Christian
  3. ediacaran finds

    arrodiscoiscyphozoanaturesrep30590.pdf Ediacaran discs from South America:probable soft-bodied macrofossils unlock the paleogeography of the Clymene ocean Maria Julia Arrouy,Lucas V.Warren,Fernanda Quaglio,Daniel Poire ,Marcello Guimares Soares,Milena Boselli Rosa,Lucia E.Gomez Peral * Nature Scientific reports (6) 30590 publ.: 27-7-2016 *all diacritics omitted
  4. Jersey shore, more or less

    Maureen Mid-Pliocene shorelines of the US Atlantic Coastal Plain — An improved elevation database with comparison to Earth model predictions A. Rovere , P.J. Hearty , J. Austermann , J.X. Mitrovica, J. Gale, R. Moucha, A.M. Forte, M.E. Raymo Earth-Science Reviews 145 (2015) 117–131 Am i saying this would be almost automatically of use to,say,anyone interested in e.g. the Yorktown,or the Pliocene Atlantic coastline in general? No,I am not always difficult ,these Should I tag MikeR,for instance??
  5. Silurian of Norway

    a recognized classic Indispensable! Worsley,Aarhus et al:The Silurian Succession of the Oslo Region NGU Bull.384,1983 ABOuT 7,5 MB NB: NO fossils are figured,the emphasis is on local correlation and stratigraphy
  6. QUAT glacai The Scheldt estuary trawl crowd might find this useful,perhaps About 5-10 mB each,source: JGSL,jan 2018 issue
  7. Texas, a short while back

    I liked the uncluttered format of this pic,decided to post it
  8. Carboniferous Midcontinent

    Concise & clear.What more do you want? algeidcontin143.pdf About 1,5 Mb
  9. Utahs top Paleontologist Jim Kirkland posted this chart on the dinosaur fauna in his state. Pretty amazing diversity See below for an enhanced poster into the triassic
  10. Animals Used The Lost Continent Of Zealandia To Spread Across The Pacific Millions Of Years Ago, Brid-Aine Parnell, Forbes, September 28, 2017 https://www.forbes.com/sites/bridaineparnell/2017/09/28/animals-used-lost-continent-of-zealandia-to-spread-across-the-pacific/ Zealandia: Scientists Reveal Secrets From First Expedition To Lost Continent, Trevor Nace, Forbes, September 28, 2017 https://www.forbes.com/sites/trevornace/2017/09/28/zealandia-scientists-reveal-secrets-from-first-expedition-to-lost-continent/ New Zealand Is Not Just A Small Bunch Of Islands – It's The Lost Continent Of Zealandia, Brid-Aine Parnell, https://www.forbes.com/sites/bridaineparnell/2017/02/17/the-lost-continent-of-zealandia/ Zealandia drilling reveals secrets of sunken lost continent South Pacific landmass may have been closer to land level than once thought, providing pathways for animals and plants, Naaman Zhou, the Guardian, September, 26, 2017 https://www.theguardian.com/world/2017/sep/27/zealandia-drilling-reveals-secrets-of-sunken-lost-continent Zealandia Blog, Stephen Parker, August 18, 2017 http://joidesresolution.org/tag/zealandia/ http://joidesresolution.org Paul H.
  11. Givetian North America

    Amongst other things,the article shows North American Paleogeography in the Devonian The correlation chart for Mid-Devonian geochemical events ain't bad ,either Zambito_givetitaghaeventisotop_2015.pdf
  12. ordovician fauna and plates

    old,but good,still cited LARGE FILE!!! http://rspb.royalsocietypublishing.org/content/royprsb/136/883/291.full.pdf NB.:link expires nov.6th
  13. a book review of: "The Monkey's Bridge: Mysteries of Evolution in Central America" by David Rains Wallace. Trinity University Press trade paperback edition (originally published by Sierra Club Books, 1997). 277 pages. Suggested Retail: $18.95 USD. The formation of the Isthmus of Panama, the land bridge connecting the Americas, was the most recent, significant tectonic event of the Cenozoic Era. It occurred just over three million years ago and carried with it not only local but also global consequences. The land connection allowed terrestrial plants and animals to invade new territories north and south as it also cut off a seaway between the Pacific and Atlantic Oceans. It would later pose a confounding and deadly obstacle course to Old World explorers and fortune-hunters - a land untamed even into the 20th century. "The Monkey's Bridge" tells three stories: how the Isthmus of Panama evolved in geologic time; how Europeans discovered Central America across the past five hundred years and how the author arrived at his understanding of it across his adult life. David Rains Wallace is an award-winning natural history writer. He has also collaborated with the National Park Service publishing handbooks about Yellowstone and Mammoth Cave. His research leading to the "The Monkey's Bridge" involved extensive travel through the Americas which also produced his earlier book about Costa Rica's national parks (Wallace, 1992). Following a 10-page prologue, the book is composed of two parts: Exploration and Evolution. Part 1 introduces the European explorers and naturalists who encountered the landforms, organisms, and native peoples of Central America. Part 2 focuses on the landforms, organisms, and peoples themselves. While the first part could be said to be the history section with the second, the prehistory section, the paleontology of the region is also discussed in the first and historic figures reappear in the second. Across both parts Wallace recalls his own trips taken from 1971 to 1994, traveling by hitchhiking, by bus, and often on foot. Wallace writes in a very literate but also readable style different from the comparatively flat descriptions of people, places, and things in the average paleo-related story. It's the difference between a professional travel writer and a scientist who is also a writer. He looks for more connections between history, art, and science while a scientist writing the same book might translate the technical into the popular without unpacking as many adjectives. While this book is clearly well-researched as Wallace cites several publications and quotes numerous people, the reader might sense that he is not a scientist from a few minor fumbles. He refers to the Florida Museum of Natural History twice as the Florida State Museum (p. 70, 71). He thinks that extinct horses did not have toes - just hooves (which he calls "hoofs"). In reality they did have hooves on their toes. Related to that, he notes that "three-toed horses were replaced by larger two-toed horses." Actually, three-toed horses had one-toed descendants without a two-toed transition. Wallace does reveal a good knowledge of today's plants and animals of the Americas. He recognizes species he didn't expect to see in Central America - forms seemingly more at home in parts of the United States. They add more diversity to the picture of the intercontinental exchange of organisms after the formation of the isthmus. Other than a map at the beginning of each of the two parts of the text, there are no illustrations. The writing will hold the attention of the average natural history fan and perhaps even interest the more casual reader used to more visual support. However, I think when dealing with extinct organisms and colorful living ones, an author should include some photos and figures to break up the text. Wallace did not feature much illustration in his "Beasts of Eden" (2004) a book about two museum murals, but he did in his "Neptune's Ark (2007), which discusses several extinct animals of the west coast of North America. Even with so little illustration I highly recommend "The Monkey's Bridge" to anyone interested in natural history. It is very informative with an excellent mainstream explanation of the geologic processes that created the Isthmus of Panama. Throughout the book, the reader travels along and experiences the author's first-timer surprise in different areas of the land bridge: the limited stretches of jungle, the sudden expanses of near-desert, and the abrupt changes in elevation. Wallace meets interesting people, visits remote museums, and seems to find himself on the edge of a bad situation more than a few times so it is an adventure well worth reading. Jess
  14. Regarding the geographic distribution of desmostylians, it's quite ironic that no desmostylians have ever been found in the West Indies or eastern North America or even Africa because DNA studies point to an African origin for all afrotheres and desmostylians themselves are afrotheres (as a matter of fact, a sirenian fossil from the Early Eocene of Tunisia described by Benoit et. al. 2013 is about the same age as the Caribbean forms Prorastomus and Pezosiren, confirming that sirenians did indeed originate in Africa along with other afrothere groups). What would be a possible explanation for the absence of desmostylians from Africa if an African origin of afrotheres implies that Desmostylia originated in Africa? Benoit J, Adnet S, El Mabrouk E, Khayati H, Ben Haj Ali M, et al. (2013) Cranial Remain from Tunisia Provides New Clues for the Origin and Evolution of Sirenia (Mammalia, Afrotheria) in Africa. PLoS ONE 8(1): e54307. doi:10.1371/journal.pone.0054307
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