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70 results for “Darriwilian”
Figure 16. Periodon aculeatus Hadding 1913. A–B, M in Middle to Late Ordovician (Darriwilian-Sandbian) Conodonts from the Dawangou Section, Kalpin Area of the Tarim Basin, Northwestern China
Figure 16. Periodon aculeatus Hadding 1913. A–B, M element; A, NIGP 152979, posterior view (IY145-001); B, NIGP 152980, anterior view (IY145-002). C–E, Sa element; C–D, NIGP 152981, C, anterior view (IY145-003), D, lateral view (IY145-004); E, NIGP 152982, lateral view (IY145-006). F–I, Sb element; F–G, NIGP 152983, F, inner lateral view (IY145-010), G, outer lateral view (IY145-013); H–I, NIGP 152984, H, upper view (IY145-018), I, inner lateral view (IY145-020). J–K, Sc element; J, NIGP 152985, outer lateral view (IY145-016); K, NIGP 152986, inner lateral view (IY145-017). L–N, Pa element; L, NIGP 152987, inner lateral view (IY145-023); M, NIGP 152988, outer lateral view (IY145-024); N, NIGP 152989, basal view (IY145-025N). O–P, Pb element; O, NIGP 152990, outer lateral view (IY145-027); P, NIGP 152991, inner lateral view (IY145-026). All from sample Nj294; scale bars 100 µm.
Middle Ordovician (middle Darriwilian) Archaeospicularia and Entactinaria (radiolarians) from the Table Cove Formation, Piccadilly Quarry, western Newfoundland, Canada
<p><span><span><span><span><span><span><span><span><span><span><span>New, distinctive, well preserved and previously undescribed constituents of a Middle Ordovician (middle Darriwilian, Dw2) radiolarian assemblage from the Table Cove Formation in Newfoundland are described. Three-dimensional X-ray micro-computed tomography (μ-CT) facilitates detailed examination of key specimens revealing hitherto unknown details of the internal morphologies of key lower Paleozoic taxonomic groups amongst which a lack of knowledge has previously impeded resolution of higher taxonomic rankings. </span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span>Twenty-seven archaeospiculid and entactinarian taxa are described and illustrated including six new species: <i>Westernbrookia polygonata</i> n. sp., <i>Neopalaeospiculum</i> <i>piccadilliensis</i> n. sp.,<i> Ramuspiculum laxum </i>n. sp.<em> </em><i>Spongentactinia</i><i>nazarovi</i> n. sp., <i>Aspiculum</i> <i>irregulare </i>n. sp.,<i> Nyfrieslandia</i> <i>ramosissima</i> n. sp., </span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span>The investigation extends the known ranges of the<em> species: </em><i>Pararcheoentactinia reedae</i> Won and Iams 2002, <i>Sphaeroentactinia robusta </i>Won, 2015, <i>Varispiculum ectospiculatum </i>Won 2015, and </span></span></span></span></span></span></span></span></span></span><i>Svalbardospiculum<em> multifurcatum (</em></i><span><span><span><span><span><span><span><span><span><span>Won, Iams and Reed) 2005, together with the genus <em>Echidnina</em><i> </i>to the mid-Darriwilian.</span></span></span></span></span></span></span></span></span></span></p>
Fig. 9 in A Darriwilian (Middle Ordovician) bivalve-dominated molluscan fauna from the Stairway Sandstone, Amadeus Basin, central Australia
Fig. 9. Diversity of entire shelly fauna in the Areyonga Gorge and Petermann Creek sections.
Goryeocrinus pentagrammos n. gen. n. sp. (Rhodocrinitidae; Diplobathrida), the first record of camerate crinoid from the Middle Ordovician (Darriwilian) of South Korea (East Gondwana)
<p><em>Goryeocrinus</em> <em>pentagrammos</em> n. gen. n. sp. from the Jigunsan Formation of South Korea is described, which is the first diplobathrid record from Middle Ordovician (middle Darriwilian) of East Gondwana. Phylogenetic analyses suggest that <em>G</em>. <em>pentagrammos</em> is a member of the paraphyletic Rhodocrinitidae of the Diplobathrida and most closely related to <em>Paradiabolocrinus</em> from the Late Ordovician (Sandbian) of Laurentia. <em>G</em>. <em>pentagrammos</em> is characterized by having a pentameral, flat bowl-shaped calyx, conspicuous pentagrammatic ridge formed by bifurcated median ray ridge and pentagonal basal ridge, at least two interradials in the first row of regular interrays, and anitaxial ridge originating from CD interray but close to C ray radial, and lacking intrabrachials and interradials between secundibrachials. The occurrence of <em>G</em>. <em>pentagrammos</em> from South Korea (East Gondwana) drastically expands Ordovician paleogeographic range of the camerates which have otherwise been recorded from Laurentia, West Gondwana, Avalonia, and Baltica.</p>
Goryeocrinus pentagrammos n. gen. n. sp. (Rhodocrinitidae; Diplobathrida), the first record of camerate crinoid from the Middle Ordovician (Darriwilian) of South Korea (East Gondwana)
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Middle Ordovician (middle Darriwilian) Archaeospicularia and Entactinaria (radiolarians) from the Table Cove Formation, Piccadilly Quarry, western Newfoundland, Canada
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Data from: Ecology, biofacies, biogeography and systematics of micromorphic lingulate brachiopods from the Ordovician (Darriwilian–Sandbian) of south-central China
Ordovician (Darriwilian to Sandbian) micromorphic linguliform lingulate brachiopods are described from the Guniutan Formation at the Fenxiang section in Hubei province, and the Maocaopu and Cili sections in Hunan province of south-central China, situated on the Yangtze Platform. A total of 7560 specimens from 155 limestone samples (within the interval of Lenodus variabilis – Pygodus anserinus biozones) are assigned to 22 species, representing a low taxonomic diversity and low abundance fauna. The fauna is dominated by the Acrotretoidea, mainly species of the Torynelasmatidae, with Torynelasma the most abundant (more than 40% of total number of specimens), along with the Eoconulidae and Eoconulus (18% of total) representing the second most common forms. Species of the Ephippelasmatidae are also common (16% of total) diverse, and include representatives of Myotreta and Numericoma, as well as Ephippelasma, whereas species of the Scaphelasmatidae are somewhat less common (13% of total). All three investigated sections represent outer shelf environments, but the Maocaopu section is situated in a relatively deeper position, in proximity of the south-eastern outer margin of the Upper Yangtze Platform, close to its boundary with the Jiangnan Slope. A quantitative analysis of the relative abundance data was carried out in order to investigate the biofacies distribution of the micromorphic brachiopod communities across the Yangtze Platform, something that has not been attempted before with Palaeozoic linguliforms. Six lingulate microbrachiopod communities could be recognized in the sections. The major biofacies shift, which occurred in the Cili section in the upper part of the Microzarkodina ozarkodella Zone, at the time of the onset and initial rise of the Mid Darriwilian Carbon Isotope Excursion (MDICE) suggests that these biofacies may have been depth controlled.
FIGURE 3 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
FIGURE 3. Sclerites of species here assigned to Acanthoparyphinae, showing unique perforate tubercle sculpture found in multiple taxa and the occasional presence of transverse pit rows in place of pleural furrows. 1, 3. Forteyops sexapugius (Ross, 1951). 1. Pygidium, SUI 148403, dorsal view, x10, Garden City Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Round Hill, near Mantua, Box Elder County, Utah, USA. 3. Left librigena, SUI 148404, external view, x20, Fillmore Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section H, 290.4 m, southern Confusion Range, Millard County, Utah, USA.. 2. Forteyops n. sp., pygidium, SUI 148405, dorsal view, x12, Wah Wah Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section J 46.8 m, southern Confusion Range, Millard County, Utah, USA. 4. Kawina? webbi Hintze, 1953, left librigena, SUI 148406 external view, x20, Wah Wah Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section J
FIGURE 5 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
FIGURE 5. Hypostomes of Early and Middle Ordovician species assigned herein to Acanthoparyphinae. 1. Cydonocephalus griphus Whittington, 1963, ventral view of hypostome in articulated cephalon, holotype specimen GSC 16272, x15, Shallow Bay Formation (lower Darriwilian), Lower Head, western Newfoundland, Canada. 2. Kawina arnoldi Whittington, 1963, ventral view of hypostome in articulated cephalon, holotype specimen GSC 162692, x7.5, Shallow Bay Formation (lower Darriwilian), Lower Head, western Newfoundland, Canada. 3. Forteyops sexapugius (Ross, 1951), hypostome, SUI 148410, ventral view, x10, Garden City Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Round Hill, near Mantua, Box Elder County, Utah, USA. 4. Kawina n. sp., hypostome, SUI 148411, ventral view, x12, Kanosh Formation (Dapingian), Section K 1.5T m, southern Confusion Range, Millard County, Utah, USA. 5. Kawina? webbi Hintze, 1953, hypostome, SUI 147662, ventral view, Wah Wah Formation (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Section J 40.0 m, southern Confusion Range, Millard County, Utah, USA. 6. Acanthoparyphinae n. gen. n. sp., hypostome, SUI 148412, ventral view, x12, Yellow Hill Limestone (Floian; Blackhillsian; "Pseudocybele nasuta Zone"), Yellow Hill, near Pioche, Lincoln County, Nevada, USA.
FIGURE 4 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
FIGURE 4. The holotype incomplete dorsal exoskeleton of Pandaspinapyga salsa Esker, 1964 (provenance given in explanation of Fig. 3.6), demonstrating the presence of 13 thoracic segments in this two pygidial segment form of Acanthoparyphinae. OU 5200, dorsal view, x10. An example of an intact pygidium of this species is illustrated in Fig. 3.6.
FIGURE 2 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
FIGURE 2. Stratigraphic column of Table Cove Formation at Section TCM, near Marechal Island, Hare Bay, Great Northern Peninsula, western Newfoundland (see Fig. 1 for exact geographic position). Horizons from which material is illustrated are shown. Light colored lithologies are limestones; dark interbeds are calcareous shales. Wavy symbols next to the column indicate beds that are debris flows.
FIGURE 1. 1 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
FIGURE 1. 1. Map of western Newfoundland, Canada. Position of detailed map of Fig. 1.2 is shown as small inset square. 2. Location of section TCM on coast north of town of Main Brook, Hare Bay, Great Northern Peninsula, western Newfoundland, Canada.
Data from: Ecology, biofacies, biogeography and systematics of micromorphic lingulate brachiopods from the Ordovician (Darriwilian–Sandbian) of south-central China
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Figure 20. A–E in Middle to Late Ordovician (Darriwilian-Sandbian) Conodonts from the Dawangou Section, Kalpin Area of the Tarim Basin, Northwestern China
Figure 20. A–E, Protopanderodus cooperi (Sweet & Bergström, 1962), from the Pratt Ferry Formation of Alabama. A–C, M element, OSU 52802, from the topotype locality, A–B, posterior views (IY170-024, IY170-025), C, anterior view (IY171-011). D–E, Sb element, OSU 52803, from the topotype locality, D, outer lateral view (IY171-012), E, inner lateral view (IY170-023). F–L, Protopanderodus varicostatus (Sweet & Bergström, 1962); from the Pratt Ferry Formation of Alabama. F–H, M2 element, OSU 52804, topotype, sample 64B2-12 from the top bed of the formation, F–G, posterior views (IY170-002, Iy170-001), F, anterior view (IY171-015); I–J, M2 element, OSU 52805 from the topotype locality, I, posterior view (IY170-007), J, anterior view (IY171-018). K–L, M1 element, OSU 52806, topotype, sample 64B2-12 from the top bed of the formation, K, posterior view (170-026), L, anterior view (IY171-013). Scale bars 100 µm.
PLATE 2 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
PLATE 2
PLATE 10 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
PLATE 10
PLATE 1 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
PLATE 1
PLATE 5 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
PLATE 5
PLATE 13 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
PLATE 13
PLATE 11 in Middle Ordovician (Darriwilian) cheirurid trilobites from the Table Cove Formation, western Newfoundland, Canada
PLATE 11
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