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220 results for “Late Ordovician”
Fig. 8 in A new Late Ordovician bubble-headed trilobite species from South West Wales and its implications for biostratigraphy
Fig. 8. Graph showing the number of lateral denticles on librigenae of various Staurocephalus species through time. Circle represents the mean, vertical lines the range where one was observed in that species. Chatterton and Campbell (1980) described S. struszi as having "twelve (possibly eleven on some specimens)" denticles. Species names in black font represent occurrences in England and Wales, those in red font occur outside Avalonia. Note that Cautleyan and Rawtheyan are regional stages from the AngloWelsh chronostratigraphy and belong in the upper part of the international Katian Stage. The remaining stages are international. The Telychian is approximately twice the length of the other stages (e.g., Ogg et al. 2008: fig. 1.1), hence the wider spacing allocated to it.
Fig. 2 in Late Ordovician scolecodonts and chitinozoans from the Pin Valley in Spiti, Himachal Pradesh, northern India
Fig. 2. Simplified lithological log of the Takche Formation at the Pin River section with the position of samples and the distribution of scolecodont and chitinozoan taxa. Sampling log on the right: solid squares denote productive samples for microfossils, whereas white squares indicate samples barren for scolecodonts and chitinozoans.
Fig. 1. A in Late Ordovician scolecodonts and chitinozoans from the Pin Valley in Spiti, Himachal Pradesh, northern India
Fig. 1. A. Geographic location of the studied area within India. The state of Himachal Pradesh and an enlarged sketch of it with the Lahaul and Spiti district (red) and the Pin Valley (green). B. Geological map of the outcropping area within the Pin Valley in Spiti with the studied section south of Farka Muth indicated. The age of the lithostratigraphic units largely follows Bhargava and Bassi (1998): Haimanta Group (late Proterozoic to middle Cambrian), Sanugba Group including the Thango Formation (Ordovician) and the Tackche Formation (Upper Ordovician to lower Silurian), Kanawar Group (Lower Devonian to lower Permian) with the Lower Devonian Muth Formation at its base, Kuling Group (Permian), Lilang Group (Lower Triassic to Upper Jurassic). C. Photograph of the studied section including the regional lithostratigraphic subdivision to units P/1–P/17. D. Palaeogeographic reconstruction with the assumed position of the Pin River section during the Late Ordovician (redrawn from Scotese 2000).
Fig. 4 in Late Ordovician scolecodonts and chitinozoans from the Pin Valley in Spiti, Himachal Pradesh, northern India
Fig. 4. Photomicrographs of the eunicid polychaete Spitiprion khannai gen. et sp. nov. apparatus preserved on an acetic acid-etched rock surface, CGS PT159_1 (sample P/8/69) from the Katian, Upper Ordovician of the Pin River section (Pin River Valley, Spiti, Himalaya, India). A1, optical microscope photograph; A2, SEM photomicrograph; A3, 3D reconstruction based on images from X-ray micro-computed tomography. The affinity of the maxilla (orange) is yet unknown (could be the second maxilla but diagnostic features are missing). A4, sketch of the maxillary apparatus of the new species of eunicid polychaete Spitiprion khannai. The maxillae white) with dotted lines are assumed according to closely related species but have not been found yet. MI, first maxilla; MII, second maxilla; MIV, fourth maxilla; AL, attachment lamella; BP, basal plate. Scale bars 100 µm.
Fig. 14 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 14. Heliolitine tabulate coral Navoites irregularis (Lin and Chow, 1977), from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. NIGP 201014. A1, A2, transverse sections. A3, A4, longitudinal sections.
Fig. 10 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 10. Heliolitine tabulate coral Wormsipora sp. from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. NIGP 201004. A1, A2, transverse sections. A3, A4, longitudinal sections.
Fig. 13 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 13. Heliolitine tabulate coral Navoites irregularis (Lin and Chow, 1977), from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. NIGP 201013. A1–A3, transverse sections. A4, longitudinal section.
Fig. 5 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 5. Heliolitine tabulate coral Plasmoporella xinjiangensis Lin and Wang in Wang, 1981, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 200955. A1, A2, transverse sections. A3–A5, longitudinal sections. B. NIGP 200946. B1, transverse section. B2, longitudinal section.
Fig. 9 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 9. Heliolitine tabulate coral Mongoliolites sp. from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. NIGP 201003. A1–A3, transverse sections. A4, A5, longitudinal sections.
Fig. 1 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 1. Map of the Xinjiang Uygur Autonomous Region (A) and southern Kuruktag, northeastern Tarim Basin (B) in Northwest China showing location of the studied area (star). C. Stratigraphic column of the studied section of Queerqueke Montain, southern Kuruktag with position of the studied material (star)
Fig. 15. Heliolitine tabulate coral Apekinella zeravshanica Ospanova, 2012a in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 15. Heliolitine tabulate coral Apekinella zeravshanica Ospanova, 2012a, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 201016. A1, A2, transverse sections. A3, A4, longitudinal sections. B. NIGP 201017. B1, B2, transverse sections. B3, longitudinal section.
Fig. 4 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 4. Heliolitine tabulate coral Plasmoporella xinjiangensis Lin and Wang in Wang, 1981, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 200945. A1, A2, transverse sections. A3, A4, longitudinal sections. B. NIGP 200973. B1, B2, transverse sections. B3 longitudinal section.
Fig. 12. Heliolitine tabulate coral Acdalopora sokolovi Bondarenko, 1958 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 12. Heliolitine tabulate coral Acdalopora sokolovi Bondarenko, 1958, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 201012. A1, A2, transverse sections. A3, A4 longitudinal sections. B. NIGP 201007. B1, B2, transverse sections.
Fig. 7. Heliolitine tabulate coral Plasmoporella grandis Bondarenko, 1958 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 7. Heliolitine tabulate coral Plasmoporella grandis Bondarenko, 1958, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 200991. A1, A2, transverse sections. A3, A4, longitudinal sections. B. NIGP 200993. B1, B2, transverse sections. B3, longitudinal section.
Fig. 6. Heliolitine tabulate coral Plasmoporella grandis Bondarenko, 1958 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 6. Heliolitine tabulate coral Plasmoporella grandis Bondarenko, 1958, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. NIGP 200990. A1, transverse section. A2, A3, longitudinal sections.
Fig. 8 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 8. Heliolitine tabulate coral Mongoliolites obliterans (Bondarenko, 1958), from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. A. NIGP 201001. A1, A2, transverse sections. A3, A4, longitudinal sections. B. NIGP 201002. B1, B2, transverse sections. B3, B4, longitudinal sections.
Fig. 3 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 3. Heliolitine tabulate coral Plasmoporella xinjiangensis Lin and Wang in Wang, 1981, from the Yuanbaoshan Formation (lower Katian) of southern Kuruktag, Tarim Basin, Northwest China. NIGP 200961. A1–A3, transverse sections. A4, A5, longitudinal sections.
Fig. 2 in Early Katian, Late Ordovician, heliolitine corals from southern Kuruktag in northeastern Tarim Basin of China
Fig. 2. Distribution of major tectonic units in the early Katian (Late Ordovician), with the Tarim Block (marked in purple). Modified from Torsvik and Cocks (2013).
Fig. 2 in Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China
Fig. 2. Outcrop photographs of sampling localities. Hammer in C, E, and F is about 26 cm long. A. Mudstone outcrop at locality 2; water bottle in the elipse is about 20 cm high. B. Close−up view of mudstone at locality 2; pen is about 13.5 cm long. C. Mudstone outcrop at locality 1. D. Brachiopod lag deposit supposedly underlying mudstone at locality 1; camera lens cap is about 5 cm in diameter. E. Mudstone outcrop at locality 3; a trench was dug to collect specimens. F. Mudstone outcrop at locality 4.
Fig. 1 in Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China
Fig. 1. Location of trilobite collecting localities at Zhuzhai, Jiangxi Province, China. GPS coordinate of the locality 2 is 28°34'23.27" N and 118°20'16.50" E. A. The map of China showing the sampling locality (the black rectangle). B. The magnified view of the rectangled area in A. C. Geologic map of the sampling locality.
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