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    Tytuł:
    A new tritylodontid from the Upper Jurassic of Xinjiang, China
    Autorzy:
    Hu, Y
    Meng, J.
    Clark, J.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/22519.pdf
    Data publikacji:
    2009
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    new tritylodontid
    tritylodontid
    Upper Jurassic
    Jurassic
    paleontology
    Xinjiang
    China
    Tritylodontidae
    Cynodontia
    cynodont
    Yuanotherium minor
    Opis:
    A new genus and species of Tritylodontidae, Yuanotherium minor, is described and compared with other known tritylodontids. The new taxon is represented by a partially preserved upper jaw with three postcanines, collected from the upper part of the Shishugou Formation (Oxfordian, Late Jurassic) in the Wucaiwan area of the Junggar Basin, northwestern Xinjiang, China. Like other tritylodontids its maxillary teeth have three rows of blade−like trenchant cusps separated by deep furrows. The new species differs from other tritylodontids mainly in having posteriormost two cusps of the median row on upper postcanines closely placed. The new tritylodontid may have been omnivorous rather than herbivorous, as previously suggested for tritylodontids in general.
    Źródło:
    Acta Palaeontologica Polonica; 2009, 54, 3; 385-391
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tetrapod trace fossils from lowermost Jurassic strata of the Moenave Formation, northern Arizona, USA
    Autorzy:
    Tanner, L.
    Lucas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061343.pdf
    Data publikacji:
    2008
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    burrows
    tetrapod
    cynodont
    tritylodontid
    rhizolith
    Moenave
    Lower Jurassic
    Opis:
    At Moenkopi Wash along the Ward Terrace escarpment of northern Arizona strata of the upper Dinosaur Canyon Member of the Moenave Formation contain sedimentary structures we interpret as casts of tetrapod burrows. Sandstone casts and in situ burrows occur concentrated in two horizons that extend several hundred meters along the Ward Terrace escarpment. The structures, hosted in beds of eolian sandstone, form interconnecting networks of burrows that branch at right angles. Individual burrow casts have sub-circular cross sections and consist of nearvertical tunnels and horizontal to low-angle galleries that connect to larger chambers. Most burrow casts measure 5 to 15 cm in diameter, are filled by sandstone of similar grain size as the host rock, and have walls that are unlined and lack external ornamentation. Bedding plane exposure of the lower horizon reveals that the density of burrows exceeds 30 vertical tunnels per square meter. One exposure in the upper horizon reveals burrows concentrated in a mound-like structure with 1 m of relief. Rhizoliths, distinguished from burrows by their typical smaller diameters, calcareous infilling, and downward branching, co-occur with these burrows in the upper horizon. The fossil burrows in the Moenave Formation appear to have been constructed by a fossorial tetrapod with social behavior similar to the modern Mediterranean blind mole-rat. Although no skeletal remains are associated with the burrows, the fossil record suggests that the most likely producers of the Moenave burrows were tritylodontid cynodonts.
    Źródło:
    Volumina Jurassica; 2008, 6, 1; 133-141
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Integrated stratigraphical study of the candidate Oxfordian Global Stratotype Section and Point (GSSP) at Redcliff Point, Weymouth, Dorset, UK
    Autorzy:
    Page, K.
    Melendez, G.
    Hart, M.
    Price, G.
    Wright, J.
    Bown, P.
    Bello, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2061363.pdf
    Data publikacji:
    2009
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    burrows
    tetrapod
    cynodont
    tritylodontid
    rhizolith
    Moenave
    Lower Jurassic
    Opis:
    Ham Cliff near Redcliff Point, Weymouth, Dorset (SW England) exposes one of Europe's most complete Callovian-Oxfordian boundary sequences and has consequently been identified as a potential candidate GSSP for the base of the Oxfordian Stage. The boundary sequence lies within the thick mudrock facies of the Oxford Clay Formation and is abundantly fossiliferous, cardioceratid ammonites in particular being conspicuous. By convention, the stage boundary is drawn at the first occurrence of the genus Cardioceras here represented by C. redcliffense Page, Melendez and Wright at the base of the Scarburgense Subchronozone of the Mariae Chronozone. Associated Perisphinctoidea (including Peltoceras, Alligaticeras and Euaspidoceras) provide additional biostratigraphical information. Other macrofossil groups show less discernible changes, although frequent belemnites (Hibolithes) provide new highresolution carbon and strontium isotope data which are consistent with global curves and continuous sedimentation across the boundary interval. Magnetostratigraphic information is also available. Foraminiferal assemblages are dominated by epistominids but include a flood of early planktonic forms, including ?Globuligerina oxfordiana (Grigelis) immediately above the boundary. Well-preserved nannofloras are dominated by Watznaueria with conspicuous Zeugrhabdotus, podorhabdids and Stephanolithion indicating the NJ14 Biozone. Ostracoda and holothurian spicules are also recorded. These results are synthesised to provide a multidisciplinary, integrated review of the suitability of Redcliff Point for the definition of an Oxfordian GSSP. Correlations with the French candidate site in Haute-Provence are discussed and proposals made for formally establishing a GSSP for the base of the Oxfordian Stage in Europe.
    Źródło:
    Volumina Jurassica; 2009, 7, 1; 101-111
    1896-7876
    1731-3708
    Pojawia się w:
    Volumina Jurassica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A new tritylodontid synapsid from Mongolia
    Autorzy:
    Watabe, M
    Tsubamoto, T.
    Tsogtbaatar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/20259.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    tritylodontid synapsid
    Bienotheroides
    Tritylodontidae
    Gobi Desert
    Mongolia
    Synapsida
    Jurassic
    paleontology
    Opis:
    The Upper Jurassic Ulaan Malgait Beds in the Shar Teg locality of southwestern Mongolia have yielded remains of a new tritylodontid therapsid (Synapsida), Bienotheroides shartegensis sp. nov. The specimen consists of a fragmentary skull associated with lower jaws. It is assigned to Bienotheroides based on its short snout, a premaxilla−palatine contact, very reduced maxilla, relatively rounded corner of upper postcanine teeth (PC), and PC cusp formula of 2−3−3. It differs from the other species of Bienotheroides in having a much more reduced middle mesial cusp of PC. It further differs from B. zigongensis and B. ultimus in having shorter and wider PC, from B. ultimus in lacking a projection at the middle mesial margin of PC, and from B. wansienensis in lacking the vestigialmost mesiobuccal cusp of PC and in lacking a diastema between upper I1 and I2. This is the first discovery of the Tritylodontidae in Mongolia. This discovery extends the taxonomic (morphological) diversity and geographic range of Bienotheroides and underlies the success of the genus in the Middle to Late Jurassic biota of eastern Eurasia.
    Źródło:
    Acta Palaeontologica Polonica; 2007, 52, 2
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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