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492 results for “Silurian”
Fig. 4 in Filling the Silurian gap of solutan echinoderms with the description of new species of Dehmicystis from Spain
Fig. 4. Camera lucida drawings of solutan echinoderm Dehmicystis ariasi sp. nov. from the Llagarinos Formation, Ludlow, Silurian, northern Central Iberian Zone, Spain; with interpretation of main anatomical parts.
Fig. 3 in Filling the Silurian gap of solutan echinoderms with the description of new species of Dehmicystis from Spain
Fig. 3. Solutan echinoderm Dehmicystis ariasi sp. nov. from the Llagarinos Formation, Ludlow, Silurian, northern Central Iberian Zone, Spain. A. MGM-208S. A1, complete specimen in dorsal aspect preserving proxistele and feeding appendage above the body. A2, counterpart of same specimen. A3, detail of feeding appendage consisting on biserial floor plates and cover plates. Gonopore on single plate, and a possible hydropore close to the feeding appendage attachment. A4, detail of the periproct on right position. Note that the periproct is visible from the inside and was located on dorsal right part of the theca. A5, detail of the appendage preserving the complete proxistele and proximal dististele. Photographs are from latex casts whitened with ammonium chloride sublimated.
Fig. 1. A, B in Late Silurian palynomorphs from the Precordillera of San Juan, Argentina: Diversity, palaeoenvironmental and palaeogeographic significance
Fig. 1. A, B. Geographic location of study areas. C, D. Geologic maps showing the fossil localities (asterisks). The northern and middle (C) and southern D) part of the Silurian–Devonian Basin. 1, Río Jáchal; 2, Río de las Chacritas; 3, Cerro La Chilca (this paper); 4, Quebrada Ancha (this paper).
High-resolution images of 1550 Ordovician to Silurian graptolite specimens for global correlation and shale gas exploration
<p>A unique graptolite 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. <br> All images were taken from 1,550 carefully curated graptolite specimens, taxonomically belong to 113 graptolite species or subspecies. They were collected from the Ordovician to Silurian sediments of China and published in 1958-2020. These specimens are preserved as shale and were collected from 154 representative geological sections of China. All specimens are housed at the Nanjing Institute of Geology and Palaeontology (NIGP), Chinese Academy of Sciences (CAS).</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.</p> <p>All in JPG format. Single JPG file ranges from 822 KB to 7.055 MB. </p> <p>Total :10.4 GB.</p>
Fig. 5 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 5. Thin sections of trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation, Ludfordian, upper Ludlow, Silurian; Delbury Quarry, Shropshire, UK. A. Holotype, NMW 2019.21G.2.3, ramose colony form (A1), thick mesozooecia walls connected by diaphragms, continue cystose shape of earlier growth (A2). B. NMW 2019.21G.2.4, autozooecia rounded in cross-section, some irregularly shaped.
Fig. 4 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 4. Thin section of trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation, Ludfordian, upper Ludlow; Delbury Quarry, Shropshire, UK. Holotype, NMW 2019.21G.2.3, bryozoan colony encrusting gastropod shell and developing ramose form at shell aperture.
Fig. 2 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 2. Trepostome bryozoan Homotrypa cochlea sp. nov. from Upper Leintwardine Formation; Ludfordian, upper Ludlow, Silurian; Delbury Quarry, Shropshire, UK. A. NMW 2019.21G.7.1, bryozoan encrusting the surface of a gastropod shell. B. NMW 2019.21G.33, bryozoan encrusting the surface of a gastropod shell but not growing across aperture.
Fig. 1 in Trepostome bryozoans encrusting Silurian gastropods: A taphonomic window and its implications for biodiversity
Fig. 1. Map showing the location and geological setting (asterisk) of Delbury Quarry in Shropshire, UK (amended from https://digimap.edina.ac.uk/roam/ map/geology and https://digimap.edina.ac.uk/roam/map/os; accessed 05/08/21).
Figure 17. A, C in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 17. A, C, Struveria sp. 2, from PL206, Wallan. A, NMV P138209, pygidium, × 2. C, NMV P139337, cranidium, × 5.5. B, Dalmanitidae indet., NMV P127957, partial view of incomplete thorax, × 0.9, from old Costerfield Antimony Mine, Costerfield. D–F, Bessazoon sp. D, NMV P147769, pygidium (fragment), × 1.8, from PL256, Wallan. E, NMV P312817, cranidium (fragment), × 2.2, from PL6361, Springfield. F, NMV P147770, pygidium (fragment), × 2.4, from PL256, Wallan.
Figure 14 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 14. Bessazoon sp. A, NMV P139479, pygidium, × 2, from ʻLancefieldʼ. B, NMV P139481, pygidium, × 3.5, from ʻLancefieldʼ. C, NMV P139475, pygidium, from ʻLancefieldʼ. D, NMV P139474, pygidium, × 2.5, from ʻLancefieldʼ. E, NMV P139477, pygidium with doublure exposed, × 6, from ʻLancefieldʼ. F, NMV P139471, crushed cephalon, × 2, from ʻLancefieldʼ. G, NMV P139427, hypostome, × 3, from PL1452, Lancefield. H, J, NMV P139438, pygidium, from PL1452, Lancefield; H, enlargement of anterolateral region showing granular sculpture, × 8; J, × 2. I, NMV P139439, crushed cephalic doublure, × 1.9, from PL1452, Lancefield. K, thoracic segment, enlargement showing granulose ornament on pleural tip, × 8, from ʻLancefieldʼ. L, NMV P139470, fragment of cephalon, × 3, from ʻLancefieldʼ. M, NMV P139473, pygidium, × 2, from ʻLancefieldʼ. (E–F are internal moulds).
Figure 13. A–K in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 13. A–K, Dalmanites athamas Öpik, 1953. A, NMV P138215, thoracopygon, × 1.5, from the ʻIllaenus bandʼ, Costerfield. B, NMV P138219, pygidium, × 3.5, from PL2269, Costerfield. C, paratype NMV P52485, cranidium, × 2, from PL2262, Costerfield. D, G, NMV P138217, pygidium, × 2, from PL389, Costerfield. E, paratype NMV P52486, cranidium, × 2, from PL2269, Costerfield. F, NMV P138218 pygidium, × 2, from PL2269, Costerfield. H, holotype NMV P52484, pygidium, × 1.5, from PL2262, Costerfield. I, NMV P138223, thorax, enlargement showing granulation, from PL2269, Costerfield. J, NMV P139805, teratological pygidium, × 2, from PL386, Costerfield. K, NMV P52482, incomplete fixigena, holotype of ʻDalmanitina (Eudolatites) aborigenumʼ Öpik, 1953, × 2, from PL2269, Costerfield. L, Struveria sp. 2, NMV P52483, pygidium, paratype of ʻDalmanitina (Eudolatites) aborigenumʼ Öpik, 1953, × 3, from PL2269, Costerfield. (B, D are latex casts)
Figure 11 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 11. Ivops wallanensis gen. et sp. nov., from PL206, Wallan. A, G, paratype NMV P138230, dorsal exoskeleton; A, × 4.3; G, × 3.2. B, F, J, L, paratype NMV P139324, exoskeleton with displaced pygidium; B, view of pygidium, × 6.5; F, view of cephalon, × 3.8; J, view of pygidium, × 5.4; L, view of cephalic doublure, × 3.8. C, E, holotype NMV P139323, enrolled exoskeleton, view of cephalon, × 3.8. D, paratype NMV P139325, cephalon, × 3.8. H–I, K, paratype NMV P139328, partly enrolled exoskeleton, view of cephalon, × 4.3. (A, C–F, J–K are internal moulds).
Figure 10. A, D, I in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 10. A, D, I, Ananaspis sp. 1 from PL1338, Wallan. A, D, NMV P139354, cranidium, × 6.5. I, NMV P139356 cephalon (fragment), enlargement of eye, × 9. B–C, Ananaspis sp. 2, NMV P136142, damaged cephalothorax, from PL1371, Coburg; B, × 1.4; C, × 1.2. E–G, J, Ananaspis typhlagogus? (Öpik, 1953), NMV P147055, cephalon (crushed) from PL206, Wallan; E–G, × 3; J, × 2.5. H, Ivops wallanensis gen. et sp. nov., paratype NMV P139326, thoracopygon, × 3, from PL206, Wallan. K, Phacopidae gen. indet. 3, NMV P312077, partly disarticulated thoracopygon, × 4.5, from PL1369, Springfield. (A, C, E–H, J–K are internal moulds).
Figure 9. Fossil localities about 1 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 9. Fossil localities about 1 km south of Costerfield township; the area covered by the map is indicated on fig. 1.
Figure 8 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 8. Ananaspis typhlagogus (Öpik, 1953). A–B, D–E, NMV P147049, partially enrolled exoskeleton from PL2263, Costerfield; A, × 2.8; B, × 3; D–E, × 3.5. C, NMV P138237, view of pygidium, × 9. F, NMV P138287, pygidium, × 4.3, from PL1460, Costerfield. G, NMV P138233, thorax, × 2.5, from the ʻIllaenus bandʼ, Costerfield. H–I, NMV P138285, pygidium, × 4.5, from PL1460, Costerfield. J, NMV P140152, cephalon, × 3.9, from PL390, Costerfield. (C, F, H–J are latex casts).
Figure 6. A–H, I in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 6. A–H, I?, J–K, Ananaspis kenleyi sp. nov. A, holotype NMV P136802, pygidium, × 6, from ʻBroadhursts Creekʼ, Wandong. B–C, paratype NMV P136821, cephalon × 4, from PL375, Kilmore East. D, paratype NMV P140156, cephalon, × 4.5, from PL375, Kilmore East. E, paratype NMV P140403, cephalon (fragment), × 2.5, from PL1691, Kilmore East. F, paratype NMV P137165, cephalon, × 3.5, from PL286, Wandong. G, paratype NMV P140154, thoracopygon with pygidium displaced and inverted, view of pygidium, × 4.5. H, paratype NMV P136820, pygidium with circular textural markings, × 4, from PL375, Kilmore East. I, paratype NMV P136815 cephalon, × 3, PL377, Kilmore East. J, paratype NMV P136819, exoskeleton with displaced cephalon, view of doublure, × 4, PL375, Kilmore East. K, paratype NMV P138648, thoracopygon, × 2.5, from ʻBroadhursts Creekʼ, Wandong. L–M, Phacopidae gen. indet. 1, NMV P136136 cephalon, × 5, from PL1368, Strathewen. (B–C, F–G, I–K are internal moulds).
Figure 18 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 18. Struveria? plinthourgos sp. nov., holotype NMV P79125, internal mould of dorsal exoskeleton, from PL1374, Camberwell; A, × 1; B–E, × 1.25.
Figure 16 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 16. Preodontochile springfieldensis sp. nov., from PL1369, Springfield. A, E–F, holotype NMV P312070, × 2. B, paratype NMV P312074, pygidium, × 2. C, G, paratype NMV P312075, thoracopygon; C, × 3; G, × 2.7. D, paratype NMV P312072, cranidium and displaced cheek, × 5. H, paratype NMV P139350, enlargement of eye, × 8. I, NMV P139351, three thoracic segments, × 1.5. (B–C, E are internal moulds).
Figure 20 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 20. Berylacaste berylae gen. et sp. nov., from PL206, Wallan. A–B, E, paratype NMV P138226, cephalon; A–B, × 4; E, enlargement of genal angle showing thorn-like genal spine. C, paratype NMV P138225, enlargement of pygidium, × 10. D, paratype NMV P139331, enlargement of pygidium, × 8.
Figure 4 in Early Silurian phacopide trilobites from central Victoria, Australia
Figure 4. Fossil localities of the Springfield Formation, Chintin Formation and Riddell Sandstone in the Springfield area, 65 km NNE of Melbourne; the area covered by the map is indicated on fig. 1. The geology of this area given by Rickards and Sandford (1998) (fig. 6) is incorrect. The presumed faunal similarities with the Bylands Siltstone are not substantiated on description of the fauna herein. On lithological and apparent faunal similarities Rickards and Sandford erroneously correlated the siltstone at PL1369 with the Bylands Siltstone and showed the Chintin Formation underlying it. Additional field observations show that the Chintin Formation crops out upstream from and hence overlies PL1369, which lies in the uppermost beds of the Springfield Formation, as mapped by VandenBerg (1991).
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