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870 results for “Ordovician”
Fig. 6 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 6. Correlation of Lower to Middle Ordovician (pre Darriwilian) successions in the Amadeus, Georgina and Canning basins of Australia with the Tabita Formation (including at its base the Yandaminta Quartzite) at Mount Arrowsmith, based on global graptolite and conodont zonations.
Fig. 29 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 29. Triangulodus sp. A: A,B, Sa element, AMF124220, TAB1/8.1, A, basal view, B, posterolateral view; C–E, Sa element, AMF124221, Y4–8, C,D, posterolateral view, E, basal view; F, Sb element, AMF120483, Y4–2, inner lateral view; G,H, Sb element, AMF120485, C1613, G, upper, inner lateral view, H, upper, outer lateral view; I, Sb element, AMF120486, C1613, postero-inner lateral view; J,K, Sc element, AMF124222, C1613, J, basal view, K, inner lateral view; L,M, Sc element, AMF124223, C1613, L, inner lateral view, M, postero-inner lateral view; N–P, Sd element, AMF120487, M/A7, N, anterolateral view, O, posterolateral view, P, close up showing the fine striae. Scale bars 100 µm, unless otherwise indicated.
Fig. 12 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 12. Cooperignathus aranda (Cooper, 1981): A–D, Pa element, AMF120333, Y4–4, A, close up showing reticulate surface structure, B, inner lateral view, C, outer lateral view, D, inner lateral, upper view; E, Pa element, AMF120334, C1611, basal view; F–H, Pb element, AMF120335, TAB1/39.5, F, upper view, G, inner lateral view, H, outer lateral, upper view; I, M element, AMF120336, W5, anterior view; J, M element, AMF120337, M/A7, posterior view; K, M element, AMF120338, C1612, basal posterior view; L, Sa element, AMF120339, TAB1/65.2, lateral view; M,N, Sb element, AMF120340, M/A7, M, lateral view, N, close up, lateral view; O,P, Sc element, AMF120341, Y4–4, O, lateral view, P, basal lateral view. Scale bars 100 µm, unless otherwise indicated.
Fig. 9 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 9. Schematic diagram to show possible evolutionary relationships of Cooperignathus. A, Acodus sp. cf. emanuelensis,?M element, AMF120702, TAB1/39.5, anterior view. B, Protoprioniodus yapu, Pb element, AMF120705, outer lateral view; C, P. yapu, Pa element, AMF120706, outer lateral view. D, C. nyinti, Pb element, AMF120703, outer lateral view; E, C. nyinti, Pa element, AMF120704, outer lateral view. F, C. aranda, Pb element AMF120335, TAB1/39.5, basal view; G, C. aranda, Pa element, AMF120334, C1611, upper view. B–E, from EC-5, Horn Valley Siltstone, Ellery Creek, Amadeus Basin. Scale bar 100µm. Bs, basal surface; Bc, basal cavity; Co, ledge-like costa defining the margin of the basal surface; Ou, outer lateral process.
Fig. 4 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 4. Bar charts illustrating relative species abundances in the Lower Ordovician conodont faunas of western New South Wales.
Fig. 21. A–L in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 21. A–L, Prioniodus sp. cf. P. amadeus Cooper, 1981: A,B, P element, AMF120412, TAB1/78.2, A, outer lateral view, B, upper, inner lateral view; C,D, P element, AMF120413, TAB1/78.2, C, upper, antero-inner lateral view, D, postero-outer lateral view; E, Sb element, AMF120415, M/A7, inner lateral view; F, Sb element, AMF120416, M/A7, outer lateral view; G, Sc element, AMF120414, TAB1/78.2, lateral view; H,I, Sd element, AMF120417, TAB1/78.2, H, inner lateral view, I, posterior view; J,K, Sa element, AMF120418, M/A11-3, lateral views; L, M element, AMF124213, W/A11-5, anterior view. M–Q, Prioniodus sp. A: M,N, Pb element, AMF120420, M/A7, M, inner lateral view, N, anterior view; O, Pa element, AMF120419, Y4–2, outer lateral view; P, Pa element, AMF120422, Y4– 2, postero-outer lateral view; Q, Pa element, AMF120421, Y4–2, upper view. Scale bars 100 µm.
Fig. 19. A–N in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 19. A–N, Oepikodus pincallyensis Zhen sp. nov.: A, M element, paratype, AMF120399, M/A7, anterior view; B,C, Pa element, paratype, AMF120401, Y4–2, B, outer lateral view, C, anterior view; D,E, Pa element, paratype, AMF120402, Y4–2, D, outer lateral view, E, upper view; F, Pa element, paratype, AMF124210, M/A7, basal view; G,H, paratype, Pb element, AMF124211, Y4–2, G, outer lateral view, H, anterior view; I–L, Pb element, Holotype, AMF120398, Y4–2, I, antero-outer lateral view, J, inner lateral view, K, upper view, L, outer lateral view; M,N, M element, paratype, AMF120400, M/A/7, M, posterior view, N, postero-inner lateral view, showing basal buttress. O, Oepikodus communis (Ethington & Clark, 1964): Pb element, AMF120403, M/A11-2, outer lateral view. Scale bars 100 µm.
Fig. 11. A–O in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 11. A–O, Cooperignathus nyinti (Cooper, 1981): A, M element, AMF120325, M/A7, anterior view; B, M element, AMF120326, TAB1/86.7, basal view; C, Sa element, AMF120327, M/A7, lateral view; D, Sb element, AMF120328, TAB1/39.5, outer lateral view; E–J, Sb element, AMF120329, TAB1/8.1, E, upper view, F, close up of the cusp, upper view, G, outer lateral view, H, inner lateral view, I, anterior view, J, close up showing striation and basal surface, anterior view; K–M, Sc element, AMF120330, M/A7, K, outer lateral view, L, upper inner-lateral view, M, upper view; N, Sc element, AMF120331, TAB1/39.5, outer lateral view; O, Sc element, AMF120332, M/A7, inner lateral view. P–X, Baltoniodus sp. A; P,Q, M element, AMF120425, Y4–2, P, close up showing the surface sculpture, Q, anterior view; R, M element, AMF120426, Y4–2, anterior view; S, P element, AMF120423, Y4–7, inner lateral view; T,U, P element, AMF120424, M/A7, T, upper view, U, upper, outer lateral view; V, P element, AMF120284, M/A11-5, basal view; W,X, P element, AMF120285, M/A11-5, W, outer lateral view, X, upper view. Scale bars 100 µm, unless otherwise indicated.
Fig. 8. A–J in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 8. A–J, Bergstroemognathus kirki Stait & Druce, 1993: A, Pa element, AMF120307, M/A11-3, outer lateral view; B, Pb element, AMF120308, M/A11-3, outer lateral view; C, Pb element, AMF120309, M/A11-3, inner lateral view; D, M element, AMF120310, M/ A11-3, posterior view; E, Sa element, AMF120311, Y4–4, posterior view; F, Sa element, AMF120212, Y4–4, anterior view; G, Sb element, AMF120313, Y4–4, posterior view; H, Sc element, AMF120314, M/A11-3, posterior view; I, Sc element, AMF120315, M/ A11-3, anterior view; J, Sd element, AMF120316, M/A11-4, anterior view. K,L, Ansella jemtlandica (Löfgren, 1978): K, Sa element, AMF120317, M/A7, lateral view; L, Sa element, AMF120318, C1612, lateral view. M–Q, Acodus sp.: M–O, septicostae element, AMF120305, M/A11-3, lateral view; P, septicostae element, AMF120304, M/A11-3, lateral view; Q, quadricostae element, AMF120306, M/A11-3, lateral view. Scale bars 100 µm.
Fig. 15 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 15. Drepanoistodus costatus (Abaimova, 1971): A–C, Sa element, AMF120361, TAB1/78.2, A, anterolateral view, B, lateral view, C, basal view; D, Sa element, AMF120362, C1612, basal view; E–G, M element, AMF120369, C1611, E, basal view, F, posterior view, G, anterior view; H, M element, AMF120368, TAB1/86.7, anterior view; I, Sb element, AMF120363, C1612, outer lateral view; J,K, Sb element, AMF120364, M/A11-5, J, basal view, K, inner lateral view; L, Sc element, AMF120365, M/A7, inner lateral view; M–O, Sc element, AMF120366, Y4–8, M, inner lateral view, N, basal view, O, outer lateral view; P–R, Sd element, AMF120367, Y4–7, P,Q, lateral views, R, basal view. Scale bars 100 µm.
Fig. 23. A–P in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 23. A–P, Protopanderodus nogamii (Lee, 1975): A, Sa element, AMF120430, C1611, basal view showing the basal cavity; B, Sa element, AMF120428, C1612, lateral view; C,D, Sb element, AMF120427, C1612, C, lateral view of the basal part showing furrow and striation, D, lateral view; E,F, Sc element, AMF120431, Y4–2, E, inner lateral view, F, outer lateral view; G,H, Sd element, AMF120429,
Fig. 24. A–D in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 24. A–D, Protoprioniodus yapu Cooper, 1981: A, M element, AMF120448, M/A7, posterior view; B,C, Pb element, AMF 120449, Y4–2, B, outer lateral view, C, inner lateral view; D, Pb element, AMF120450, M/A7, outer lateral view. E,F, Oneotodus sp.: E, AMF120451, M/A11-3, posterolateral view; F, AMF 124226, C1612, inner lateral view. Scale bars 100 µm.
Fig. 16. Erraticodon patu Cooper, 1981 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 16. Erraticodon patu Cooper, 1981: A,B, Pa element, AMF120370, M/A11-3, A, posterobasal view, B, posterior view; C, Pa element, AMF120371, Y4–6, posterior view; D, Pb element, AMF120372, M/A4, postero-upper view; E, Pb element, AMF120373, Y4–5, antero-outer lateral view; F, Pb element, AMF120374, Y4–7, upper, anterior view; G, Pb element, AMF120375, Y4–7, upper, posterior view; H, Pb element, AMF120376, M/A4, upper, posterior view; I, Pa element, AMF120296, Y4–6, anterior view; J,K, Pb element, AMF124209, M/A7, J, antero-upper view, K, postero-upper view. Scale bars 100 µm.
Fig. 28 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 28. Triangulodus larapintinensis (Crespin, 1943): A,B, Pa element, AMF120476, TAB1/85.7, A, inner lateral view, B, outer lateral view; C,D, Pb element, AMF120477, Y4–6, C, inner lateral view, D, outer lateral view; E, M element, AMF120478, Y4–6, anterior view; F, M element, AMF120479, M/A7, posterior view; G, Sa element, AMF120480, M/A7, anterior view; H, Sa element, AMF120481, Y4–6, posterolateral view; I, Sa element, AMF120482, M/A4, lateral view; J,K, Sa element, AMF124214, Y4–8, lateral views; L,M, Sb element, AMF120484, Y4–7, L, inner lateral view, M, outer lateral view; N,O, Sb element, AMF124215, Y4–8, N, inner lateral view, O, basal view; P,Q, Sc element, AMF124216, Y4–8, P, basal view, Q, inner lateral view; R,S, Sc element, AMF124217, Y4–7, R, outer lateral view, S, inner lateral view; T, Sd element, AMF124218, M/A11-3, outer lateral view; U,V, Sd element, AMF124219, Y4–8, U, posterior view, V, outer lateral view. Scale bars 100 µm.
Fig. 25 in Early Ordovician Conodonts from Far Western New South Wales, Australia
Fig. 25. Scalpellodus latus (van Wamel, 1974): A,B, Sa element, AMF120452, Y4–2, A, inner lateral view of the basal part showing the fine striae, B, lateral view; C, Sb element, AMF120453, Y4–2, inner lateral view; D, Sb element, AMF120454, M/A11-1, inner lateral view; E,H, Sd element, AMF120455, M/A7, E, inner lateral view, H, close up showing fine striae; F, Sd element, AMF120456, M/A7, posterior view; G, P element, AMF120457, TAB1/39.5, inner lateral view; I, Sd element, AMF120458, M/A7, inner lateral view; J, Sc element, AMF120459, Y4–2, lateral view. Scale bars 100 µm, unless otherwise indicated.
Data from: The Fezouata Shale Formation biota is typical for the high latitudes of the early Ordovician – a quantitative approach
<p>The Fezouata Shale Formation has dramatically impacted our understanding of early Ordovician marine ecosystems before the Great Ordovician Biodiversification Event (GOBE), thanks to the abundance and quality of exceptionally preserved animals within. Systematic work has noted that the shelly fossil sub-assemblages of the Fezouata Shale biota are typical of open-marine deposits from the Lower Ordovician, but no studies have tested the quantitative validity of this statement. We extracted 491 occurrences of recalcitrant fossil genera from the Paleobiology Database to reconstruct 31 sub-assemblages, to explore the paleoecology of the Fezouata Shale and other contemporary, high-latitude (66°S – 90°S) deposits from the Lower Ordovician (485.4 Ma – 470 Ma) and test the interpretation that the Fezouata Shale biota is typical for an Ordovician open-marine environment. Sørensen's dissimilarity metrics and Wilcoxon tests indicate that the sub-assemblages of the Tremadocian-aged lower Fezouata Shale are approximately 20 percent more heterogenous than the Floian-aged upper Fezouata Shale. Dissimilarity metrics and visualization suggests that while the lower Fezouata and upper Fezouata share faunal components, the two sections have distinct faunas. We find that the faunal composition of the lower Fezouata Shale is comparable with other Tremadocian-aged sub-assemblages from high latitudes, suggesting that it is typical for an early Ordovician open-marine environment. We also find differences in faunal composition between Tremadocian- and Floian-aged deposits. Our results corroborate previous field-based and qualitative systematic studies that concluded that the shelly assemblages of the Fezouata Shale are comparable with those of other Lower Ordovician deposits from high latitudes. This establishes the first quantitative baseline for examining the composition and variability within the assemblages of the Fezouata Shale which will be key to future studies attempting to discern the degree to which it can inform our understanding of marine ecosystems just before the start of the GOBE.</p>
→ Fig. 2. Marellomorph arthropod Mimetaster florestaensis sp. nov. from Tremadocian of Mojotoro Mountains, Salta, Argentina. A–C. CNS-I 133/1-1, part. A. Cephalic shield and spines. Detail of the secondary spines on mediolateral spine (A2). B. View of the imprint of the ventral posterior margin of the cephalic shield. C. Explanatory drawing revealing the most important morphological characters. D. CNS-I 133/1-1´, counterpart showing detail of strong secondary spines on anterolateral spine. Arrows indicate the secondary spines. in A new marrellomorph euarthropod from the Early Ordovician of Argentina
→ Fig. 2. Marellomorph arthropod Mimetaster florestaensis sp. nov. from Tremadocian of Mojotoro Mountains, Salta, Argentina. A–C. CNS-I 133/1-1, part. A. Cephalic shield and spines. Detail of the secondary spines on mediolateral spine (A2). B. View of the imprint of the ventral posterior margin of the cephalic shield. C. Explanatory drawing revealing the most important morphological characters. D. CNS-I 133/1-1´, counterpart showing detail of strong secondary spines on anterolateral spine. Arrows indicate the secondary spines.
Fig. 17 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 17 (previous page). Rioceratid and orthocerid cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A-C. Eosomichelinoceras borealis sp. nov., from bed PO 123.3. A. Specimen FMNH-P30278, lateral view with ventral, prosiphuncular side toward left. B. Specimen FMNH-P30279, lateral view with ventral, prosiphuncular side toward left. C. Specimen FMNH-20288, holotype, ventral view. D–F, I. Hinlopoceras tempestatis gen. et sp. nov., from bed PO 07. D. Specimen FMNH-P30359, lateral view with ventral, prosiphuncular side toward right. E. Specimen FMNH-30479, adult(?) body chamber, ventral view, prosiphuncular side. F. Specimen FMNH-P30362, strongly annulated fragment of body chamber. G–H, J. Hinlopoceras venti gen. et sp. nov. G. Specimen FMNH-P30262, from bed PO 07, lateral view with ventral, prosiphuncular side toward left. H. Specimen FMNH-P30266, from bed PO 7.5, lateral view with ventral, prosiphuncular side toward right. I. Specimen FMNH-P30360; note the nearly smooth adapical part of the fragment. J. Specimen FMNH-P30267, from bed PO 7.5, lateral view with ventral, prosiphuncular side toward left. Scale bar = 10 mm for all figures.
Fig. 55 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 55. Model of cephalopod habitat and faunal composition for three intervals (trilobite biozones V1a, V1b-c, V2b) of the depositional time of the Olenidsletta Member, Floian, Ordovician at Profilstranda (PO) section, Ny Friesland, Spitsbergen. Absolute water depth is estimated from septal implosion depths of cephalopods during V2b, from presence of photic zone biomarker signatures in all Olenidsletta Member samples (Lee et al. 2019), and from a global amplitude of eustatic sea level change of ca 80 m during the Floian (Haq & Schutter 2008).
Fig. 53 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 53. Cephalopod occurrences in sampled intervals of the Olenidsletta Member, Floian, Ordovician, Profilstranda (PO) section, Ny Friesland, Spitsbergen. 0 from Fortey (1980), 1 from Lehnert et al. (2013), 2 from Cooper & Fortey (1982). Grey shaded time interval marks nileid trilobite assemblage after Fortey & Barnes 1977. Section from Kröger et al. (2017). Symbols for organism groups as in Fig. 3.
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