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492 results for “Silurian”
FIG. 4. — Stroinolepis maenniki n. gen., n in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 4. — Stroinolepis maenniki n. gen., n. sp., microstructure of the scales, Pi 7648, sample MF 49-7, Strojnaya River, October Revolution Island, Ozernaya Formation, Middle-Upper Ordovician. Abbreviations: dt, dentine tubules; lac, lacunae of dentine canals. Scale bar: 0.1 mm.
FIG. 12 in Ordovician and Lower Silurian thelodonts from Severnaya Zemlya Archipelago (Russia)
FIG. 12. — Set of scales of Paralogania consimilis n. sp.; A-E, head scales; F, G, transitional scales; H-P, S, T, W, trunk scales; Q, R, U, V, fin scales; A, LIG 35-149; B, LIG 35-150; C, LIG 35-151; D, LIG 35-152; E, LIG 35-153; F, LIG 35-154; G, LIG 35-155; H, LIG 35-156; I, LIG 35-163; J, K, LIG 35-168; L, LIG 35-169; M, LIG 35-170; N, LIG 35-171; O, LIG 35-172; P, LIG 35-173; Q, R, LIG 35- 174; S, LIG 35-175; T, LIG 35-176; U, LIG 35-177; V, LIG 35-178; W, LIG 35-179; sample 31-208, Ushakov River, October Revolution Island, upper part of Samojlovich Formation, Wenlock, Lower Silurian. Scale bar: 0.3 mm.
FIG. 4. — Drawings made after SEM photos from Figures 2 and 3 in Silurian and Lower Devonian anaspids (Agnatha) from Severnaya Zemlya (Russia)
FIG. 4. — Drawings made after SEM photos from Figures 2 and 3 to illustrate different sculptures of birkeniids of the region; A-C, Birkenia? sp.; D, Birkeniida sp. C; E, G, Birkeniida sp. C1; F, I, Birkeniida sp. C?; H, Birkeniida sp. D; J, Birkeniida sp. F?; K, Birkeniida sp. G; L, Birkeniida sp. H; M, Birkeniida sp. J; N, O, Birkeniida sp. F; A, LIG 35-922; B, LIG 35-918; C, LIG 35-921; D, Pi 7570; E, LIG 35-925; F, LIG 35-929; G, LIG 35-916; H, Pi 7583; I, LIG 35-923; J, LIG 35-924; K, LIG 35-931; L, LIG 35-926; M, Pi 7573; N, LIG 35-919; O, LIG 35-914. A, C, E, I, J, L, N, sample 30-1; B, sample 30, Ushakov River; D, O, sample 157-4; F, sample 47-14, Spokojnaya River, October Revolution Island, lower part of Ust' Spokojnaya Formation, lower Ludlow; G, sample 5d; H, sample 2803; K, sample 8g-1, Pioneer Island, Ludlow; M, sample 157-3, upper part of Ust' Spokojnaya Formation, upper Ludlow, Upper Silurian. Scale bars: A-H, J-N, 0.5 mm; I, O, 0.1 mm.
FIG. 6. — Vilkitskilepis valentinae n. gen., n in Silurian and Lower Devonian anaspids (Agnatha) from Severnaya Zemlya (Russia)
FIG. 6. — Vilkitskilepis valentinae n. gen., n. sp., drawing of the specimen in Fig. 5; A, holotype, LIG 35-909 A, part; B, holotype, LIG 35-909 B, counterpart. Abbreviations: af, anal fin; bb, branchial band; drs, dorsal ridge scales; dls, dorso-lateral scales; pas, preanal spine; pbp, post-branchial plate; pbs, pre-branchial scales; pp?, pectoral plate(?); ps?, pectoral spine?; sps, spiny scales along the ventral mid-line between the pre-anal spine and anal fin; vs, ventral scales; vls, ventro-lateral scales. Scale bar: 1 cm.
FIG. 5. — Vilkitskilepis valentinae n. gen., n in Silurian and Lower Devonian anaspids (Agnatha) from Severnaya Zemlya (Russia)
FIG. 5. — Vilkitskilepis valentinae n. gen., n. sp.; trunk squamation, holotype LIG 35-909, part (A) and counterpart (B); sample 67-12, Pod''emnaya River, October Revolution Island, Severnaya Zemlya Formation, Lochkov, Lower Devonian. Scale bar: 1 cm.
FIG. 15 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 15. — Rusanov and Al'banov formations, and the lowermost part of the Vstrechnaya Formation. Boundaries between formations are indicated by lines. Abbreviations: D1rs, Rusanov Formation; D 1 al, Al'banov Formation; D 2
FIG. 13 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 13. — Severnaya Zemlya Formation. In the centre of the figure (cliff), argillaceous limestones and argillites of the upper part of the formation are exposed. Spokojnaya River, outcrop 41(?). Photo by V. Menner.
FIG. 12 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 12. — Devonian section on the Matusevich River (for location of outcrops see Figs 1 and 2; for legend refer to Fig. 5). To the right of the lithological log are shown the rock colour, the numbers of the beds described, and the extent of the outcrops studied. The interval above bed 6 in outcrop 18a was not described in detail. Abbreviation: S, top of Silurian strata (Ust'-Spokojnaya Formation).
FIG. 11 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 11. — Dolomitic marlstones and argillaceous dolostones of the Ust'-Spokojnaya Formation. Matusevich River, outcrop 2. Photo by P. Männik.
FIG. 10 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 10. — The Silurian-Devonian boundary between argillaceous limestones below and conglomeratic sandstones above. The hammer lies on the upper surface of the Silurian strata. Matusevich River, contact between sections 2 (below) and 1 (above). Photo by P. Männik.
FIG. 9 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 9. — Localities in the Spokojnaya River region. For legend refer to Fig. 1. Numbers correspond to outcrops.
FIG. 8 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 8. — Stromatolites in the middle part of the Samojlovich Formation. The length of the hammers handle is about 80 cm. Ushakov River, outcrop 32. Photo by P. Männik.
FIG. 7 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 7. — Reef in the upper part of the Srednij Formation. Srednij Island, outcrop 1(79). Photo by P. Männik.
FIG. 6 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 6. — Localities on the Ushakov and Strojnaya rivers. For legend refer to Fig. 1. Numbers correspond to outcrop numbers.
FIG. 5 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 5. — Silurian section on the Matusevich River, and in the Spokojnaya River-Krasnaya Bay region (for location of outcrops see Figs 1; 2; 9). To the right of the lithological log are shown the numbers of the beds described, and the extent of the outcrops studied. The interval above bed 24 in outcrop 45 was not logged in detail. 1, limestone; 2, argillaceous limestone; 3, dolomitized limestone; 4, limestone with pentamerids; 5, limestone with tabulate corals; 6, limestone with stromatoporoids; 7, limestone with stromatolites; 8, coral-stromatoporoid biostromes and bioherms; 9, oolithic limestone; 10, oncolitic limestone; 11, carbonate conglomerates; 12, silicified limestone; 13, sandstone; 14, conglomeratic sandstone; 15, fine cross-bedding in sandstone; 16, coarse cross-bedding in sandstone; 17, marlstone; 18, dolomitized marlstone; 19, siltstone; 20, argillite; 21, gypsum. Colour of rock for Fig. 12: 22, grey; 23, red; 24, variegated.
FIG. 2 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 2. — Localities on the Matusevich River (= A on Fig. 1). For legend refer to Fig. 1. Numbers along river correspond to outcrops as shown on logs in Figs 4 and 12.
FIG. 1 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 1. — Distribution of Palaeozoic strata on Severnaya Zemlya, showing location of studied sections and spot samples (geology modified from Egiazarov 1959). Areas A, B and C show the location of detailed maps in Figs 2; 6; 9. Areas of Silurian outcrops studied on Pioneer Island (according to Klubov et al. 1980) are indicated as follows: I, samples 2A-4G; III, samples 4D-6A, 8G; V, sample 12. Samples 7A-7B, 8D-8G, 9E, 9Zh and 10A-10B come from areas I or II (precise location not known). Bedov. R., Bedovaya River; Obryv. R., Obryvistaya River; Gr. R., Gremyashchaya River; Krasn. Bay, Krasnaya Bay; Pod. R., Pod''emnaya River. 1, Cambrian and older rocks; 2, Ordovocian; 3, Silurian; 4, Devonian to Quaternary strata.
FIG. 4 in Silurian and Devonian strata on the Severnaya Zemlya and Sedov archipelagos (Russia)
FIG. 4. — Limestones in the lower part of the Vodopad Formation. Matusevich River, outcrops 13a and 13. Photo by P. Männik.
FIGURE 8 in A trilobite cluster from the Silurian Rochester Shale of New York: predation patterns and possible defensive behavior
FIGURE 8. Plot of regressed PC coordinates against log-centroid size and histogram of maximum specimen length, coded for injured and noninjured specimens. A, Regressed PC coordinates against log-centroid size that shows no obvious pattern in injured and noninjured specimens, although many of the larger specimens are injured. B, Histogram of specimen length has an approximately normal distribution with the two largest specimens showing an injury.
FIGURE 1. Slab preserving a in A trilobite cluster from the Silurian Rochester Shale of New York: predation patterns and possible defensive behavior
FIGURE 1. Slab preserving a cluster of 18 fully articulated individuals of Arctinurus boltoni (AMNH- FI-101514–101531) from the mid-Silurian (Wenlock) Rochester Shale, New York state. Stars indicate injured specimens. Scale bar = 10 cm.
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