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870 results for “Ordovician”
FIGURE 1. 1 in Systematics of the Lower Ordovician pliomerid trilobite Hintzeia, with species from the Great Basin, western USA
FIGURE 1. 1. Road map showing the Ibex area of the Tule Valley, Millard County, western Utah and the location of Section G (black rectangle) in the southern Confusion Range. 2. Portion of U.S. Geological Survey 1: 24,000 Warm Point provisional 7.5' quadrangle topographical map (1991) depicting line of Section G. 3. Road map with location of sections HC5 and HC6 (black box) in Hillyard Canyon, Bear River Range, Franklin County, southeastern Idaho. 4. Lines of sections HC6 and HC5 on areas of U.S. Geological Survey Mapleton (1988) and Egan Basin (2005) 1: 24,000 7.5' quadrangle topographical maps, respectively.
Supplementary Data for "Synchronous asteroid breakup paused the Great Ordovician Biodiversification Event"
<p>Supplementary Data includes a detailed comparison of the YW2 borehole with the well-studied Puxi River section, the U-Pb isotopic data of the bentonite, and coupled carbon isotope data of the YW2 borehole. </p>
Dataset for Globally synchronous meteorite rain paused the Great Ordovician Biodiversification Event
<p>Supporting information includes a detailed comparison of the stratigraphy of the YW2 borehole with the well-studied Puxi River section, the U-Pb isotopic data from the bentonite, and coupled carbon isotope data from the YW2 borehole.</p>
A new marrellomorph arthropod from southern Ontario: A rare case of soft tissue preservation on a late Ordovician open marine shelf
<p>Ordovician open marine lagerstätten are relatively rare and widely dispersed, producing a patchy picture of the diversity and biogeography of non-mineralized marine organisms, and challenging our understanding of the fate of Cambrian groups. Here, for the first time, we report soft-bodied fossils, including a well-preserved marrellomorph arthropod, fragmentary carapaces, and macroalgae, from the late Ordovician (Katian) Upper Member of the Kirkfield Formation near Brechin, Ontario. The unmineralized elements and associated exceptionally preserved shelly biota were entombed rapidly in storm deposits that smothered the shallow, carbonate-dominated shelf. The marrellomorph, <em>Tomlinsonus dimitrii</em> gen. et sp. nov., is remarkable for its ornate, curving cephalic spines and pair of hypertrophied appendages, suggesting a slow-moving, benthic lifestyle. Re-evaluation of marrellomorph phylogeny using new data favours an arachnomorph affinity, though internal relationships are robust to differing outgroup selection. Clades Marrellida and Acercostraca are recovered, but the monophyly of Marrellomorpha is uncertain. The new taxon is recovered as sister to the Devonian <em>Mimetaster</em>, and, as the second youngest known marrellid, bridges an important gap in the evolution of this clade. More generally, the Brechin biota represents a rare window into Ordovician open marine shelf environments in Laurentia, representing an important point of comparison with contemporaneous lagerstätten from other paleocontinents, with great potential for further discoveries.</p>
The Ordovician retroarc foreland basin on the Yangtze Block linked to the final assemblage of Gondwana
<p>Supplementary materials for the paper entitled<em><strong> </strong>The Ordovician retroarc foreland basin on the Yangtze Block linked to the final assemblage of Gondwana.</em></p>
An Ordovician to Silurian graptolite specimen image dataset for global correlation and shale gas exploration
<p>A unique high-resolution image dataset consists of key graptolite species used for dating rocks, global correlation, and “gold caliper” for locating shale gas favourable exploration beds (FEBs) in China.</p> <p>All images were taken from 1,550 carefully curated graptolite specimens, taxonomically belong to 113 graptolite species or subspecies. These specimens were collected from 154 representative geological sections of the Ordovician to Silurian sediments of China and published in 1958-2020. All specimens are housed at the Nanjing Institute of Geology and Palaeontology (NIGP), Chinese Academy of Sciences (CAS). Detailed scientific information of every piece of fossil specimen is given in the attached spreadsheet file.</p> <p>My working group spent over two years to complete photographing every specimen using a single-lens reflex camera Nikon D800E with Nikkor 60 mm macro-lens and Leica M125 and M205C microscopes equipped with Leica cameras. Every image is well focused and better shows the morphology of graptolite bodies.</p> <p>In total, we took 40,597 images, including 20,644 camera photos (each with a resolution of 4,912 × 7,360) and 19,953 microscope photos (each with a resolution of 2,720 × 2,048). Photos of low contrast or bad focus were removed from the whole collection. We only kept and selected the photos that show the visual morphology of every specimen and the diagnostic character of each graptolite species that the specimens represent. We selected one image for each specimen as the present final dataset, uploaded to and stored in our cloud server.</p> <p>We incorporated revision suggestions from distinguished palaeontologists to generate the ground-truth labels, providing a taxonomical authority of the dataset. The dataset potentially contributes to a range of scientific activities and provides 1) easy access to high-resolution images of 2951 specimens of 113 graptolite species for teaching and training in palaeontology and geologic survey; 2) Global bio-stratigraphic correlation using graptolites, especially with those bio-zone species; 3) A standard fossil specimen image dataset used in shale gas industry to improve exploration efficiency, and 4) The potential aid of developing image-based automated classification model.</p> <p>Every specimen has two photos, one is original, another shows specimen with a scale bar. Occasionally in some large image the scale bar is embedded and beside the fossil specimen. Example: The file name: ‘9721Cardiograptus_amplus_S.jpg’, ‘9721’ is the specimens number, ‘Cardiograptus_amplus’ means species name is ‘Cardiograptus amplus’, with ‘_S’ means it is a photo with scale bar. In all scale bar, the minimum unit is millimeter.</p> <p>Author and contact:</p> <p>Hong-He Xu</p> <p>Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences</p> <p>39 East Beijing Road, Nanjing, 210008</p> <p>China</p> <p>E-mail: hhxu@nigpas.ac.cn</p>
FIGURE 9 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 9. Mioptychopyge thebawi (Reed) from the Hwe Mawng Beds (uppermost Katian) and Li-Lu Formation (Katian), northern Shan State, Myanmar. 1a, b. Cranidium (original of Reed 1915, pl. 6, fig. 5), GSI 11525, Nawng Yun, original and retrodeformation. 2. Hypostome (original of Reed 1915, pl. 6, fig. 9), GSI 11529, Lilu. 3a, b. Pygidium (original of Reed 1915, pl. 7, fig. 1), GSI 11533, Hwe Mawng, original and reetrodeformation. 4a, b. Cranidium (original of Reed 1915, pl. 6, fig. 7), GSI 11527, Hkawnhkok, original and retrodeformation. 5. Pygidium (original of Reed 1915, pl. 6, fig. 8), GSI 11528, Mong Ha. 6a, b. Pygidium (original of Reed 1915, pl. 6, fig. 12), GSI 11532, Hwe Mawng, original and retrodeformation. 7. Pygidium (original of Reed 1915, pl. 6, fig. 11), GSI 11531, Hwe Mawng. Scale bar = 5 mm for 1, 3–7; = 2 mm for 2.
FIGURE 12 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 12. (1–6,8,10) Reedocalymene unicornis (Reed) from the Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. 1–3. Cranidium (original and refigured of Reed 1917, pl. 8, fig. 10a,b), GSI 11913. 4. Pygidium (refigured from Reed 1917, pl. 8, fig. 13), GSI 11911?. 5. Partial cranidium (original of Reed 1917, pl. 8, fig. 12); GSI 11912?. 6. Partial cranidium (refigured from Reed 1917, pl. 8, fig. 11), GSI 11912?. 8. Partial cranidium (refigured from Reed 1917, pl. 8, fig. 12), GSI 11912?. 10. Partial cranidium (original of Reed 1917, pl. 8, fig. 11), GSI 11912?. (7) Reedocalymene? sp. (Reed), Thorax and pygidium (original of Reed 1917, pl. 8, fig. 14), GSI 11914, Shihtien Formation (Darriwilian); Pupiao, Baoshan Prefecture, western Yunnan, China. (9,11–15) Neseuretinus aff. birmanicus (Reed) from the Li-Lu and Pupiao formations (Katian). 9. Cranidium (lectotype, original of Reed 1906, pl. 5, fig. 27), GSI 8341, Kunkaw, northern Shan State, Myanmar. 11. Cranidium; CMC IP 91532, Pupiao, Baoshan Prefecture, western Yunnan, China. 12. Pygidium and partial thorax, CMC IP 91533, Pupiao, Baoshan Prefecture, western Yunnan, China. 13. Pygidium, CMC IP 91534, Pupiao, Baoshan Prefecture, western Yunnan, China. 14, 15. Pygidium (original of Reed 1915, pl. 8, fig. 5), GSI 11553, Loikok, northern part of Shan State, Myanmar, dorsal and right lateral views. Scale bars = 2 mm for 1–6, 8–10, 12–15; = 5 mm for 7, 11.
FIGURE 15 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 15. (1–4) Metopolichas? sp. 1 (Reed) from the Li-Lu and Kunlein formations (Katian), northern Shan State. 1. Hypostome (original of Reed 1915, pl. 7, fig. 15), GSI 11546, Mân-ngai. 2. Hypostome (original of Reed 1915, pl. 7, fig. 16), GSI 11547, Lilu. 3. Partial cranidium (original of Reed 1915, pl. 7, fig. 14), GSI 11545, Tâ-Pangtawng. 4a, b. Immature cephalon (original of Reed 1915, pl. 7, fig. 17), GSI 11548, Makmongshai, original and retrodeformation. (5) Illaenus caecoides Reed, Complete specimen (refigured from Reed 1917, pl. 7, fig. 9), GSI 11898, Shihtien Formation (Darriwilian), Banpo Village, Shidian County, Baoshan Prefecture, western Yunnan, China. (6–8) Phorocephala mansuyi, Cranidium (refigured and original from Reed 1917, pl. 8, fig. 7), GSI 11848, dorsal and lateral views, Shihtien Formation (Darriwilian), Pu-piao, Baoshan Prefecture, western Yunnan, China. (9) Metopolichas sp. 2 (Reed), Cephalon (original of Reed 1917, pl. 8, fig. 9), GSI 11910, Shihtien Formation (Darriwilian); Pupiao, Baoshan Prefecture, western Yunnan, China. (10) Stygina? sp. (Reed), Cranidium (original of Reed 1915, pl. 7, fig. 13), GSI 11544, Hwe Mawng Beds (uppermost Katian), Mong-Ha, northern part of Shan State, Myanmar. Scale bars = 2 mm for 1, 10; = 1 mm for 2, 4, 6–9; = 5 mm for 3, 5.
FIGURE 5 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 5. Correlation of lithostratigraphic units from Shan State, Myanmar, and the Baoshan Block of western Yunnan.
FIGURE 1 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 1. The modern configuration of the northern part of the Sibumasu terrane with the Baoshan (darkest gray shading) and Tenchong (lightest gray shading) blocks differentiated. Modified from Wernette et al. (2021, fig. 1), where these units are discussed.
FIGURE 8 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 8. (1–6) Birmanites yunnanensis (Reed) from the Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. 1. Librigena (original of Reed 1917, pl. 7, fig. 3), GSI 11892. 2. Pygidium (original of Reed 1917, pl. 7, fig. 6), GSI 11895. 3. Pygidium (original of Reed 1917, pl. 7, fig. 8), GSI 11897. 4. Librigena (original of Reed 1917, pl. 7, fig. 5), GSI 11894. 5. Articulated specimen (original of Reed 1917, pl. 6, fig. 12), GSI 11887. 6. Cephalon (original of Reed 1917, pl. 6, fig. 14), GSI 11889. (7, 10) Remopleuriidae gen. et sp. indet. (Reed) from the Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. 7. Cranidium, (original of Reed 1917, pl. 6, fig. 9), GSI 11884. 10. Librigena (original of Reed 1917, pl. 6, fig. 10), GSI 11885. (8) Dolerobasilicus? sp. (Reed), Pygidium (original of Reed 1915, pl. 7, fig. 3), GSI 11535, Lower Naungkangyi Beds, Nawa, northern Shan State, Myanmar. (9) Nileus sp., Hypostome (original of Reed 1917, pl. 8, fig. 5), GSI 11904, Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. (11, 12) Niobe sp. (Reed). 11a, b. Pygidium (original of Reed 1915, pl. 5, fig. 14), GSI 11516, Hwe Mawng Beds (uppermost Katian), Nati, northern part of Shan State, Myanmar, original and retrodeformation. 12. Pygidium (original of Reed 1917, pl. 6, fig. 11), GSI 11886, Shihtien Formation (Darriwilian), Shidian, Baoshan Prefecture, western Yunnan, China. Scale bars = 5 mm for 1–6, 8, 9; = 2 mm for 7, 10–12)
FIGURE 4 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 4. Map of the Baoshan area, western Yunnan, China. Areas designated as Ordovician outcrops follow the 1990 Geological Map of Yunnan. Shidian indicates the county government seat rather than the name of the town. See text for further information about the individual fossil localities.
FIGURE 6 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 6. Birmanites birmanicus (Reed) from the Hwe Mawng Beds (uppermost Katian), northern Shan State, Myanmar. 1. Hypostome (original of Reed 1915, pl. 5, fig. 17), GSI 11519, Hwe Mawng. 2a, b. Cephalon (original of Reed 1915, pl. 6, fig. 2), GSI 11522, Hwe Mawng, original and retrodeformation. 3. Partial specimen (original of Reed 1915, pl. 6, fig. 3), GSI 11523, Hpakhi. 4a, b. Pygidium (original of Reed 1915, pl. 6, fig. 4), GSI 11524, Hwe Mawng, original and retrodeformation. 5. Cranidium (original of Reed 1915, pl. 7, fig. 2), GSI 11534, Hpakhi. 6. Partial specimen (original of Reed 1915, pl. 5, figs 15,16), GSI 11518, Hpakhi. Scale bars = 2 mm for 1; = 5 mm for 2–6.
FIGURE 14 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 14. (1–7) Parillaenus liluensis (Reed) from the Li-Lu formation (Katian), Lilu, northern Shan State, Myanmar. 1. Cranidium (original of Reed 1915, pl. 7, fig. 10), GSI 11541. 2. Cranidium (original of Reed 1915, pl. 7, fig. 12), GSI 11543. 3. Cranidium (refigured from Reed 1915, pl. 7, fig. 4), GSI 11536. 4. Pygidium and partial thorax (refigured from reed 1915 Pl. 7, fig. 7), GSI 11538. 5. Complete specimen (refigured from Reed 1915, pl. 7, fig. 5), GSI 11537. 6. Complete specimen (original of Reed 1915, pl. 7, fig. 5), GSI 11537. 7. Hypostome (refigured from Reed 1915, pl. 7, fig. 6), GSI 11537. (8, 11) Illaenus sp. 2 (Reed) from the Shihtien Formation (Darriwilian, Banpo Village, Shidian County, Baoshan Prefecture, western Yunnan, China. 8. Pygidium (original of Reed 1917, pl. 7, fig. 12), GSI 11901. 11. Cranidium (original of Reed 1917, pl. 7, fig. 13), GSI 11902. (9, 10) Illaenus sp. 1 (Reed) from the Hwe Mawng Beds (uppermost Katian) and Li-Lu Formation (Katian), northern Shan State, Myanmar. 9. Cranidium (original of Reed 1915, pl. 7, fig. 8), GSI 11539, Hwe Mawng. 10. Cranidium (original of Reed 1915, pl. 7, fig. 9), GSI 11540, Mân-ngai. (12) Illaenus sp. 3 (Reed), Cranidium (original of Reed 1917, pl. 8, fig. 1), GSI 11905, Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. Scale bar = 1 mm for 1, 2, 7; = 5 mm for 3, 8–12; = 2 mm for 4–6.
FIGURE 3 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 3. Map of the northern part of Myanmar's Shan State. Areas designated as Ordovician outcrops follow LaTouche (1913). See text for further information about individual fossil localities.
FIGURE 11 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 11. Encrinurella insangensis (Reed) from the Li-Lu and Kunlein Formations (Katian), northern Shan State, Myanmar. 1a, b. Cranidium (original of Reed 1915, pl. 8, fig. 16), GSI 11562, Hweyawt, original and retrodeforamtion. 2. Cranidium (original of Reed 1915, pl. 8, fig. 15), GSI 11561, Mân-ngai. 3. Cranidium (original of Reed 1915, pl. 8, fig. 18), GSI 11564, Makmongshai. 4. Cranidium (original of Reed 1906, pl. 5, fig. 24), GSI 8338, Kun-lein. 5. Pygidium (original of Reed 1915, pl. 8, fig. 19), GSI 11565, Mân-ngai. 6. Pygidium (original of Reed 1915, pl. 8, fig. 20), GSI 11566, Mân-ngai. 7. Pygidium (original of Reed 1906, pl. 5, fig. 20), GSI 8336, Insang. 8. Thorax (original of Reed 1906, pl. 5, fig. 25), GSI 8339, Ledet. 9. Cranidium and pygidium (lectotype, original of Reed 1906, pl. 5, figs 21&22), GSI 8335, Hweyawt. 10. Cranidium and pygidium (original of Reed 1906, pl. 5, figs 19 and 23), GSI 8334, Hweyawt. Scale bars = 2 mm.
FIGURE 2 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 2. Asian Equatorial Gondwanan terranes in their modern configuration and regional context. Modified from Metcalfe (2011, 2017), Burrett et al. (2014) and Loydell et al. (2019). B = Baoshan, BRS = Bentong-Raub suture zone, C = Chanthaburin, I = Inthanon, K= Kon Tum, S = Simao/Ailaoshan, ST = Sukhothai, TS = Trýờng Sõn, SD = Sông Ðà, T = Tengchong, Y = Yun- ling. The terranes commonly considered to constitute greater Indochina, as shown here, also include Loei, Trýờng Sõn, Simao, and Kon Tum.
FIGURE 13 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 13. (1) Hadromeros? submitis (Reed), Cranidium (original of Reed 1915, pl. 8, fig. 13), GSI 11560, Li-Lu Formation (Katian); Lilu, northern Shan State, Myanmar. (2) Placoparina? dravidicus (Reed), Pygidium (original of Reed 1915, pl. 8, fig. 12), GSI 11559, Lower Naungkangyi Beds; Mâ Shio, northern Shan State, Myanmar. (3) Sphaerocoryphe sp. (Reed), Cranidium (original of Reed 1906, pl. 5, fig. 26), GSI 8340, Naungkangyi Beds, Insang, northern part of Shan State, Myanmar. (4–9) Yanhaoia wynnei (Reed) from the Li-Lu Formation (Katian) and Hwe Mawng Beds (uppermost Katian), northern Shan State, Myanmar. 4. Cranidium (original of Reed 1915, pl. 9, fig. 3), GSI 11569, Mân-ngai. 5. Partial cranidium (original of Reed 1915, pl. 9 fig. 7), GSI 11573, Hwe Mawng. 6. Partial cranidium (original of Reed 1915, pl. 9, fig. 11), GSI 11577, Mong Ha. 7. Pygidium (original of Reed 1915, pl. 9, fig. 12), GSI 11578, Hpakhi. 8. Cranidium and thorax (cast from lectotype, original of Reed 1915, pl. 9, fig. 10), GSI 11576, Hwe Mawng. 9. Pygidium (original of Reed 1915, pl. 9, fig. 5), GSI 11571, Nawng Yu. (10–11) Dalmanitina? dagon (Reed) from the Li-Lu Formation (Katian) and Hwe Mawng Beds (uppermost Katian), northern Shan State, Myanmar. 10. Cranidium (refigured from Reed 1915, pl. 9, fig. 2), GSI 11568-11572, Mân-ngai. 11. Cephalon (original of Reed 1915, pl. 9, fig. 1), GSI 11568, Mân-ngai. (12) Illaenus sp. (Reed), Partial cranidium (refigured from Reed 1917, pl. 8, fig. 3), GSI 11906, Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. Scale bar = 2 mm for 1, 3, 4, 6–9; = 5 mm for 2, 5, 10–12.
FIGURE 10 in Revision of F. R. C. Reed's Ordovician trilobite types from Myanmar (Burma) and western Yunnan Province, China
FIGURE 10. (1, 2) Lonchodamas? sp. (Reed) from the Li-Lu Formation (Katian), Lilu, northern Shan State, Myanmar. 1a, b. Pygidium (original of Reed 1915, pl. 5, fig. 6), GSI 11508, original and retrodeformation. 2. Cranidium (refigured from Reed 1915, pl. 5, fig. 5), GSI 11507. (3, 6) Lonchodamas shanensis (Reed) from the Hwe Mawng Beds (uppermost Katian), northern Shan State, Myanmar. 3. Pygidium (original of Reed 1915, pl. 5, fig. 3), GSI 11505, Hwe-hok. 6. Cranidium (original of Reed 1915, pl. 5, fig. 2), GSI 11504, Mong Ha. (4) Dionide hybrida (Reed), Cephalon (original of Reed 1915, pl. 5, fig. 7), GSI 11509, Hwe Mawng Beds (uppermost Katian), Hwe-hok, northern Shan State, Myanmar. (5, 8) Ovalocephalus? sp. indet. (Reed) from the Li-Lu Formation (Katian), Mân-ngai, northern part of Shan State, Myanmar. 5. Cranidium (original of Reed 1915, pl. 8, fig. 17), GSI 11563. 8. Thorax (original of Reed 1915, pl. 8, fig. 21), GSI 11567. (7) Pliomerina martellii (Reed), Cranidium (original of Reed 1917, pl. 8, fig. 15), GSI 11915, Shihtien Formation (Darriwilian), Pupiao, Baoshan Prefecture, western Yunnan, China. (9) Prionocheilus liluensis (Reed), Cranidium (original of Reed 1915, pl. 8 figs 6 and 7), GSI 11554, Li-Lu Formation (Katian), Lilu, northern Shan State, Myanmar. (10, 13) Ovalocephalus sp. (Reed) from the Li-Lu Formation (Katian), Lilu, northern Shan State, Myanmar. 10. Pygidium (original of Reed 1915, pl. 8, fig. 9), GSI 11556. 13. Cephalon; not previously figured; no GSI catalogue number. (11, 12) "Calymene" oldhami (Reed) from Lower Naungkangyi Beds (probable Darriwilian), Mâ Shio, northern Shan State, Myanmar. 11. Cephalon and thorax (original of Reed 1915, pl. 8, fig. 11), GSI 11558. 12. Cephalon and partial thorax (original of Reed 1915, pl. 8, fig. 10), GSI 11557. Scale bars = 2 mm for 1–3, 6, 8–13; = 5 mm for 4, 5; = 1 mm for 7.
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