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870 results for “Ordovician”
Fig. 2 in Sequence of post-moult exoskeleton hardening preserved in a trilobite mass moult assemblage from the Lower Ordovician Fezouata Konservat-Lagerstätte, Morocco
Fig. 2. Wrinkled specimens of trilobite Symphysurus ebbestadi Gutiérrez-Marco, Rábano, and García-Bellido 2018, from the early Ordovician of Tigzigzaouine area, Morocco, photographed under low-angle incident lighting, in order to emphasise the three-dimensional surface texture of their exoskeletons. Specimens are organised in relative order of exoskeleton hardening, from that with the most wrinkled and soft exoskeleton (A) to the least wrinkled (D) before being fully hardened. A. MGL 102132. B. MGL 102134. C. MGL 102128. D. MGL 102133. Scale bars 5 mm.
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.
Fig. 6 in Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China
Fig. 6. Late Ordovician trilobites from Xiazhen Formation near Zhuzhai, Yushan County, China. A–E. Meitanillaenus? sp. A. NIGP−151995, cranidium from locality 3; dorsal (A1) and anterior (A2) views. B. NIGP−151996, cranidium from locality 3; dorsal (B1) and lateral (B2) views. C. NIGP−151997, cranidium from locality 3, dorsal view. D. NIGP−151998, cranidium from locality 3, dorsal view. E. NIGP−151999, cranidium from locality 3, dorsal view. F. Amphilichas sp., NIGP−152000, cranidium from locality 3; dorsal (F1), oblique posterior (F2), anterior (F3), and lateral (F4) views. G. Eokosovopeltis sp., NIGP−152001, pygidium from locality 2, dorsal view. H. Eokosovopeltis cf. currajongensis (Edgecombe and Webby, 2007), NIGP− 152002, pygidium from a limestone layer overlying the mudstone at locality 1, dorsal view. I. Styginidae indet. sp. B, NIGP−152003, hypostome from locality 3, ventral view. J. Styginidae indet. sp. A, NIGP−152004, incomplete thoraco−pygidium with four thoracic segments from locality 3, dorsal view. K, M. Asaphidae indet. K. NIGP−152005, free cheek from locality 2, dorsal view. M. NIGP−152006, pygidium from locality 3, dorsal view. L. Nileus sp., NIGP−152007, articulated specimen minus free cheeks from locality 2; posterior (L1), anterior (L2), lateral (L3), and dorsal (L4) views. Scale bars 2.5 mm, except E, F, I 1 mm; G, H, K 5 mm.
Fig. 3 in Late Ordovician trilobites from the Xiazhen Formation in Zhuzhai, Jiangxi Province, China
Fig. 3. Reconstruction of new species described from the Late Ordovician Xiazhen Formation; all drawings are not to scale. A. Remopleurides xiazhenensis sp. nov., dorsal view of exoskeleton (A1), and dorsal (A2) and ventral (A3) view of thoracic segments; exact extent of thoracic axial spine in A1 is not known and articulating half ring is reconstructed as if the anterior margin is broadly notched (see text for details). B. Hibbertia aodiensis sp. nov., dorsal view of exoskeleton; pits and caeca are omitted. C. Vietnamia yushanensis sp. nov., dorsal view of exoskeleton (C1) and lateral view of thoracic segments (C2); granules (see Fig. 9N) are omitted. D. Ceraurinus zhuzhaiensis sp. nov., dorsal view of exoskeleton; granules (see Fig. 10B1, B3) are omitted. E. Pliomerina tashanensis sp. nov., dorsal view of cranidium.
Fig. 2. The marrellomorph arthropod Furca bohemica Fritsch, 1908 in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 2. The marrellomorph arthropod Furca bohemica Fritsch, 1908 from the Upper Ordovician (Sandbian) of Bohemia (Ostrý Hill and Veselá, Beroun District). A. NML 32991. B. NML 32992. C. NML 32993. D. NML 32994a. E. NML 32994b. F. NML 32995. G. NML 32996. H. NML 32997. I. NML 33000. Scale bars 10 mm.
Fig. 7. A in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 7. A new morphological reconstruction of the marrellomorph arthropod Furca bohemica Fritsch, 1908 in dorsal view. Scale bar 10 mm.
Fig. 1 in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 1. Stratigraphic section of the Letná Formation at Ostrý Hill. Abbreviations: md, mudstone; slt, siltstone; fsd, fine sandstone; msd, medium sandstone.
Fig. 4 in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 4. Diagrammatic representations of character and character states. A. The cephalic morphology of the marrellids Furca (A1) and Marrella (A2). B. Morphological variation of the dorsal shield of the acercostracans Xylokorys (B1) and Vachonisia (B2). C. Comparison of the rounded endopod endites of Marrella (C1: arrowed) and the spinose endites of Olenoides (C2). Abbreviations: a, anterolateral spines; m, mediolateral spines; p, posterolateral spines; mr, median ridge.
Fig. 3. The marrellomorph arthropod Furca bohemica Fritsch, 1908 in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 3. The marrellomorph arthropod Furca bohemica Fritsch, 1908 from the Upper Ordovician (Sandbian) of Bohemia (Ostrý Hill and Veselá, Beroun District). A. NML 32998 (A1) and detailed view (A2). B. NML 33001a. C. NML 33001b. D. NML 40881. E. NML CD784−9143a. F. NML CD784−9143b. G. NML CD748−7845b. Scale bars 10 mm.
Fig. 6. The marrellomorph arthropod Furca bohemica Fritsch, 1908 in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 6. The marrellomorph arthropod Furca bohemica Fritsch, 1908 from the Upper Ordovician (Sandbian) of Bohemia (Ostrý Hill and Veselá, Beroun District). A. NML 40865. B. NML 40861. C. NML 40875. Scale bars 10 mm.
Fig. 8 in A revision of the Late Ordovician marrellomorph arthropod Furca bohemica from Czech Republic
Fig. 8. Phylogeny of marrellomorph arthropods. Single MPT (most parsimonious tree) (CI = 0.941; RI = 0.941). Tree length is 17 steps with equally weighted characters. With implied weighting tree length equals 0.1667 (k = 5), 0.25 (k = 3) and 0.50 (k = 1). Numbers on the left of the branches indicate support values for jackknifing, and those in brackets are for symmetric resampling. Numbers on the right of branches indicate Bremer support values. Outgroup taxa are represented by trilobite Olenoides serratus.
Fig. 4 in Preservation of soft tissues in an Ordovician linguloid brachiopod from China
Fig. 4. Pedicle of the Early Ordovician and Recent linguloid brachiopods. A. The most complete specimen of Leontiella sp. from the lower Ordovician Fenxiang Formation of Hubei Province, China (PKUM02−0614a); general view showing partially preserved shell (in upper right of the photograph) and pyritized vermiform pedicle (A1) and more detailed view (A2). B. External morphology of the pedicle of extant Lingula anatina Lamarck, 1801, locality unknown (ZPAL Bp 70/6) (compare with A2). C, D. Two enlargements of pedicle from Fenxiang Formation, Hubei Province, China; PKUM02−0614b (C) and PKUM02−0615 (D). Note the surface fine transverse annuli and wider transverse wrinkles, as well as short longitudinal ridges well preserved in D. A slight damage in the upper part of D (arrowed) shows some thickness of the preserved pedicle. E. Fragment of pedicle with well preserved external morphology from Fenxiang Formation, Hubei Province, China (PKUM02−0616); a damage shows three−dimensional aspect of the preserved pedicle.
Fig. 1 in Preservation of soft tissues in an Ordovician linguloid brachiopod from China
Fig. 1. Geographic and stratigraphic location of the Ordovician linguloid fauna. A. Geological sketch map of Yichang area, Hubei Province, China, showing locality of the Tianjialing section. B. Position of the bed from which the present material was collected (arrow head) in the Fenxiang Formation rock column at the Tianjialing section (after Baliński et al. 2012, modified).
Fig. 3 in Preservation of soft tissues in an Ordovician linguloid brachiopod from China
Fig. 3. Linguloid Leontiella sp. from the Early Ordovician Fenxiang Formation of Hubei Province, China. A. Incomplete ventral interior showing pseudointerarea and pedicle groove (ZPAL Bp 70/1). B. Incomplete dorsal internal mould showing median ridge (ZPAL Bp 70/2). C. Fragment of ventral valve showing left pseudointerarea and partly preserved pedicle groove (ZPAL Bp 70/3). D. External surface ornament (ZPAL Bp 70/4). C, D, SEM micrographs.
Fig. 2 in Asterozoan pedicellariae and ossicles revealed from the Middle Ordovician of Baltica
Fig. 2. Asterozoan pedicellariae (A–D) and ossicles from (E–H) from the Mishina Gora section, Middle Ordovician. A. TUG 1611-1, external view. B. TUG 1611-2, internal view. C. TUG 1611-3, internal view. D. TUG 1611-4, external view. E. TUG 1611-5 asterozoan disk (?) ossicle. F. TUG 1611-6 asterozoan interradial (?) ossicle. G. TUG 1611-7 asterozoan interradial (?) ossicle. H. TUG 1611-8 asterozoan disk (?) ossicle. Scale bars 200 μm.
Fig. 1 in Asterozoan pedicellariae and ossicles revealed from the Middle Ordovician of Baltica
Fig. 1. Location map (A), excerpt of the simplified geological map of the area (B), plan of the quarry (C), and stratigraphy of the Mishina Gora section 1 (D). Abbreviations: O, Ordovician; S, Silurian; D, Devonian outcrop area.
Fig. 3 in A review of the endocerid cephalopod Protocyptendoceras from the Floian (Lower Ordovician) of the Eastern Cordillera, Argentina
Fig. 3. Stratigraphic column at La Ciénaga, 5 km northwest of Purmamarca, indicating the beds containing cephalopods.
Fig. 2. A in A review of the endocerid cephalopod Protocyptendoceras from the Floian (Lower Ordovician) of the Eastern Cordillera, Argentina
Fig. 2. A. Map of Argentina with the Jujuy region in black. B. Jujuy region with the study are indicated. C. Location map of the fossil locality (La Ciénaga), 5 km northwest of Purmamarca.
Fig. 1 in A review of the endocerid cephalopod Protocyptendoceras from the Floian (Lower Ordovician) of the Eastern Cordillera, Argentina
Fig. 1. Explanation of some of the measurements indicated in Table 2: a, distance between adjacent sutures; b, dorsoventral conch diameter; c, distance between the plane of the suture and the culmination of the septum. (a/b).100 = Cam. Dep. (c/b).100 = Sep. Dep. For abbreviations see epigraph of Table 2.
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