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90 results for “Graptolites”
Fig. 22. A,B. Thallograptus christoffersonae n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 22. A,B. Thallograptus christoffersonae n.sp.: A, AM F114765, stipe development from basal holdfast, BF14 and B, AM F114746, holotype, F14; C, Koremagraptus obscurus n.sp. AM F114745,
Fig. 20. A–E, Acanthograptus praedeckeri praedeckeri n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 20. A–E, Acanthograptus praedeckeri praedeckeri n.subsp., respectively AM F114568, AM F114568, AM F114741, AM F114742 and AM F114740, all from F14; F, Acanthograptus praedeckeri minimus n.subsp., AM F114630, F6. Scale bars 1 mm.
Fig. 16. A, Callograptus ulahensis n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 16. A, Callograptus ulahensis n.sp., AM F114760, holotype, BF15; B, Callograptus niagarensis, AM F114739, W885; C–E, Pseudodictyonema graptolithorum, respectively AM F114755, AM F114753 and AM F114645, all from F14. Scale bars 1 mm.
Fig. 17. A, Callograptus ulahensis n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 17. A, Callograptus ulahensis n.sp., AM F114760, holotype, BF15; B, Stelechocladia praeattenuata n.sp., AM F114743, holotype, BF28; C,D, Acanthograptus praedeckeri praedeckeri n.sp., respectively AM F114792, holotype, BF28 and AM F114568a, F14. Scale bars 1 mm.
Fig. 14. A, Callograptus bridgecreekensis n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 14. A, Callograptus bridgecreekensis n.sp., AM F114569a, holotype, F14; B,C, Callograptus rigbyi n.sp., respectively AM F114651a, holotype, BF28, and paratype AM F114643, W885. Scale bars 1 mm. Note that in Fig. 14B the isolated autothecae of Cyclograptus? australis can be seen at bottom right and on Fig. 14C a specimen of Acanthograptus praedeckeri occurs at the top.
Fig. 18. A, Dictyonema warrisi n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 18. A, Dictyonema warrisi n.sp., AM F114629b, F14; B, Thallograptus christoffersonae n.sp., AM F114644, W885. Scale bars 1 mm.
Fig. 12. A, Dictyonema paululum australis n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 12. A, Dictyonema paululum australis n.subsp., AM F114757, holotype, BF14; B, Dictyonema warrisi n.sp., holotype AM F114647a, F14. Scale bars 1 mm.
Fig. 13. A–D, Dictyonema muirae n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 13. A–D, Dictyonema muirae n.sp., respectivelyAM F114763, BF14, AM F114775, F14, holotype AM F114762, F14, and AM F114764, BF14 proximal part of colony attached to pebble of phosphate; E–G, Dictyonema warrisi n.sp., respectively AM F114647, F14, holotype AM F114717, W885 and AM F114647, F14, with stipes more proximal than E; H, Dictyonema sp. 1, AM F11475, F14. Scale bars 1 mm; shading on C indicates badly preserved area.
Fig. 11. A,B, Dictyonema jenkinsi n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 11. A,B, Dictyonema jenkinsi n.sp., AM F114748, respectively distal thecae and proximal end close to holdfast, F14. Scale bars 1 mm.
Fig. 10. A in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 10. A, Dictyonema falciferum, AM F114750, F14; B–D, Dictyonema venustum, respectively AM F114648 and AM F114873, both BF14, and AM F114751, BF28. Scale bars 1 mm; arrow on B indicates damaged area discussed in text.
Fig. 9. A–E in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 9. A–E, illustrating contrasting stipe and dissepimental patterns in distal parts of colonies: A, Dictyonema cf. delicatulum, AM F114749; B, Dictyonema williamsae n.sp., AM F114565, holotype; C, Dictyonema falciferum, AM F114750; D, Dictyonema venustum, AM F114648a, F14; E, Dictyonema paululum australis n.subsp., holotype AM F114757. Scale bars 1 mm.
Fig. 4. A–G in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 4. A–G, different types of bithecae: A, Bulman's (1928, 1933) Type 1 with bitheca n+1 opening along the lateral wall of autotheca n. This is the most common of autothecal/bithecal relationships; B,C, Bulman's (1928, 1933) Type 2 in which the bithecal aperture opens inside the autothecal tube or aperture; D, Bulman's (1928, 1933) Type 3 where the n+1 bithecal aperture is located on the dorsal side of the aperture of autotheca n; E, Bulman's (1928, 1933) Type 4 in which the bithecal tube n+1 passes between the dorsal wall of autotheca n and the ventral wall of autotheca n+ 1; F,G, Bulman's (1928, 1933) Type 5 a modification of Type 4 in which the bithecal tube turns proximally or distally before the bithecal aperture is reached; H–M, autothecal variation in Dictyonema species; H, autothecal aperture is the termination of a simple tube; I, the ventral lip projects as a short, sharp denticle; J, the ventral lip projects as a spine which may or may not bifurcate; K, the ventral process is adorned with a large shield-like plate; L, the dorsal apertural process has plate-like process hanging more or less in front of the aperture; M, the apertural region is isolated from the ventral wall of the next autotheca; for the sake of simplicity in H–M the Type 1 bithecal arrangement is shown; fuselli omitted; a, autothecal aperture; b, bithecal aperture; these structures are described or commented upon in various places in the text.
Fig. 3 in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 3. Early evolution of some benthic Dendroidea, and modifying the suggestions of Chapman et al. (1996), and illustrating the rôle of anastomosis and dissepiments development. Full explanation is to be found in text. Asterisks indicate genera from which species are described in this paper. Boxes indicate approximate time of appearance of that character.
Fig. 7. A in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 7. A, Dictyonema venustum, AM F114751, BF28; B, Dictyonema williamsae n.sp., holotype AM F114565, W885; C– E, Dictyonema jenkinsi n.sp., respectively AM F114747, F14, holotype AM F114716, BF24; and AM F114761, F14, holdfast region attached to roughly circular object, possibly a pebble; F,G, Dictyonema paululum australis n.subsp., AM F114757, parts of holotype, BF14. Scale bars 1 mm; on B hatching indicates specimen obscured by sediment, stipple indicates badly preserved area, and horizontal shading indicates fractures in rock.
Fig. 6. A,B, Dendrograptus avonleaensis n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 6. A,B, Dendrograptus avonleaensis n.sp., respectively AM F114650 and holotype AM F114646a, both from BF14; C, Dictyonema cf. delicatulum, AM F114749, F14. Scale bars 1 mm.
Fig. 8. A, Dictyonema williamsae n in Dendroid and Tuboid Graptolites from the Llandovery (Silurian) of the Four Mile Creek Area, New South Wales
Fig. 8. A, Dictyonema williamsae n.sp., holotype AM F114565, F14; B, Dictyonema falciferum, AM F114750, F14. Scale bars 1 mm.
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. 8. Mastigograptus aff. tenuiramosus. A in The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus
Fig. 8. Mastigograptus aff. tenuiramosus. A. Thecal base of Fig. 6B. Scale bar 50 µm. B, C. Fractured thecal bases, and occluded autotheca (arrowed) (ZPAL G.30/17). Scale bars: B, 100 µm, C, 50 µm. D. Thecal base on main stem, with occluded autotheca (arrowed), a needle preparation from ZPAL G.30/18. Scale bar 20 µm. E. Stem, looking obliquely proximally, with two thecal bases (ZPALG.30/15). Scale bar 200 µm. F, G, H. Successively more distal cross−sections of thecal bases. Scale bars 10 µm, 50 µm, 100 µm. I. Thecal base with occluded autotheca (ZPALG.30/17). Scale bar 50 µm. J. Diaphragm of stolonal triad in thecal base, looking proximally (ZPALG.30/15). Scale bar 10 µm. K. Stolotheca looking proximally with adjacent thecal base displaying astolothecaltriad,seeH(ZPALG.30/11).Scalebar200µm. L.Crassal,fusellarandcorticaltissuesinthecalbase(ZPALG.30/17).Scalebar5µm. M."E.T. head" of thecal base, with central occluded autotheca (ZPAL G.30/4). Scale bar 50 µm.
Fig. 4. Mastigograptus aff. tenuiramosus. A in The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus
Fig. 4. Mastigograptus aff. tenuiramosus. A. Fractured wall of stolotheca. The head of a fusellus is arrowed (ZPALG.30/9). Scale bar 10 µm B, C. External ornament on stolothecae (ZPAL G.30/10). Scale bars 100 µm, 50 µm. D. Sectional view of stolonal triad on main stem, looking distally (ZPAL G.30/11). Scale bar 50 µm. E. Stolonal triad on main stem, looking proximally; diaphragm at base of occluded autotheca (arrowed) (ZPALG.30/12). Scale bar 50 µm. F. Base of diaphragm on main stem, looking distally, and showing two pores (ZPALG.30/13). Scale bar 10 µm. G. Portion of stem with monopodial branch to right. a, occluded first thecal base on branch, with short stolotheca. b, borings on main stem (ZPAL G.30/14). Scale bar 500 µm.
Fig.3. Mastigograptus aff. tenuiramosus. A in The ultrastructure, development, and systematic position of the graptolite genus Mastigograptus
Fig.3. Mastigograptus aff. tenuiramosus. A.Stipewiththickcortexandfracturedthecalbase.(ZPALG.30/4).Scalebar100µm. B.Occludedthecalbaseon proximal portion of stem (ZPALG.30/3). Scale bar 10 µm. C. Proximal portion of stem, with occluded sicula and first thecal base. (ZPALG.30/2). Scale bar 200 µm. D. Portion of stem with monopodial branch (ZPALG.30/5). Scale bar 2 µm. E. Fractured stolotheca; distal to left (ZPALG.30/6). Scale bar 50 µm. F. Fractured stem with thick cortex and borings (ZPALG.30/7). Scale bar 50 µm. G. Amphorate stolothecae, and broken thecal bases (ZPALG.30/4) Scale bar 1 mm. H. Amphorate stolotheca, looking proximally. (ZPAL G.30/8). Scale bar 100 µm. I. Stereopair view of thecal base (ZPAL G.30/4). Scale bar 100 µm.
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Allen Brain Atlas
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.