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  • 1
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    New early Jurassic tetrapod assemblages constrain Triassic-Jurassic tetrapod extinction event (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-08-28
    Description: The discovery of the first definitively correlated earliest Jurassic (200 million years before present) tetrapod assemblage (Fundy basin, Newark Supergroup, Nova Scotia) allows reevaluation of the duration of the Triassic-Jurassic tetrapod extinction event. Present are tritheledont and mammal-like reptiles, prosauropod, theropod, and ornithischian dinosaurs, protosuchian and sphenosuchian crocodylomorphs, sphenodontids, and hybodont, semionotid, and palaeonisciform fishes. All of the families are known from Late Triassic and Jurassic strata from elsewhere; however, pollen and spore, radiometric, and geochemical correlation indicate an early Hettangian age for these assemblages. Because all "typical Triassic" forms are absent from these assemblages, most Triassic-Jurassic tetrapod extinctions occurred before this time and without the introduction of new families. As was previously suggested by studies of marine invertebrates, this pattern is consistent with a global extinction event at the Triassic-Jurassic boundary. The Manicouagan impact structure of Quebec provides dates broadly compatible with the Triassic-Jurassic boundary and, following the impact theory of mass extinctions, may be implicated in the cause.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olsen, P E -- Shubin, N H -- Anders, M H -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):1025-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3616622" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Fossils ; Invertebrates ; Nova Scotia ; *Paleontology ; Vertebrates
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Molecular phylogeny of the animal kingdom (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-02-12
    Description: A rapid sequencing method for ribosomal RNA was applied to the resolution of evolutionary relationships among Metazoa. Representatives of 22 classes in 10 animal phyla were used to infer phylogenetic relationships, based on evolutionary distances determined from pairwise comparisons of the 18S ribosomal RNA sequences. The classical Eumetazoa are divided into two groups. Cnidarians arose from a protist ancestry different from the second group, the Bilateria. Within the Bilateria, an early split gave rise to Platyhelminthes (flatworms) and the coelomate lineage. Coelomates are thus monophyletic, and they radiated rapidly into four groups: chordates, echinoderms, arthropods, and eucoelomate protostomes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Field, K G -- Olsen, G J -- Lane, D J -- Giovannoni, S J -- Ghiselin, M T -- Raff, E C -- Pace, N R -- Raff, R A -- GM34527/GM/NIGMS NIH HHS/ -- HD16739/HD/NICHD NIH HHS/ -- HD21337/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1988 Feb 12;239(4841 Pt 1):748-53.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Molecular and Cellular Biology, Indiana University, Bloomington 47405.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3277277" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Evolution ; Humans ; Invertebrates/*genetics ; *Phylogeny ; RNA, Ribosomal/*genetics ; RNA, Ribosomal, 18S/*genetics ; Species Specificity
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
    Location Call Number Expected Availability
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