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306 results for “Early Cambrian”
Fig. 48 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 48. Problematicum Rhombocorniculum cancellatum (Cobbold, 1921) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A–C, E, F. Slender sclerites, sample 7/60. A. SMNH X 4756; A1, distal end of sclerite; A2, proximal end of sclerite; A3, lateral view. B. SMNH X 4757; lateral view. C. SMNH X 4758; lateral view. E. SMNH X 4759; lateral view. F. SMNH X 4760; F1, lateral view; F2, close-up of basal end showing microstructure. D, G. Sclerites, sample 7/62. D. Slender sclerite, SMNH X 4761; lateral view. G. Broad sclerite, SMNH X 4762; G1 and G2, lateral views. Scale bar 300 μm, except F2, 60 μm.
Fig. 28 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 28. Hyolith opercula Conotheca spp. from lower Cambrian Emyaksin Formation, Malaya Kuonamka River and Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A–C. Opercula with long processes, sample K1-3B. A. SMNH X 4630; oblique dorsal (A1), inner (A2), and lateral (A3) views. B. SMNH X 4631; dorsal (B1), inner (B2), and lateral (B3) views. C. SMNH X 4632; outer view. D. Operculum without processes, SMNH X 4633, sample 7/31.5; dorsal (D1) and inner (D2) views. Scale bar 600 μm, except A1, 300 μm.
Fig. 35 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 35. Tommotiid Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sellate sclerites, L-forms. A. SMNH X 4682, sample 6/14; A1, plan view; A2, lateral view on the larger lobe; A3, lateral view on the smaller lobe; A4, view on the duplicature; A5, view on the margin of sclerite; A6, apical view. B. SMNH X 4683, sample 6/3.9; plan (B1), apical (B2), and marginal (B3) views; B4, lateral view on the smaller lobe; B5, lateral view on the larger lobe. C. SMNH X 4684, sample 6/3.9; view on the inner side. Scale bar 1200 μm, except A4, C, 600 μm. sella dividing the sclerite into larger and smaller lobes (e.g., of the dorsal surface, but is only weakly ornamented with Figs. 35A1, B1, 36B1, C1). The sella occupies 1/4 to 1/2 of smooth longitudinal and co-marginal folds. A duplicature the sclerite width. It represents a deep longitudinal depres- strongly adpressed to the opposing wall occupies apical and sion with each side marked by a ridge. With the apical angle lateral parts of larger specimens (Fig. 35A4). The apex is ~30°, the ridges diverge greater in smaller specimens. The coiled through less than half a whorl. ridge situated on the larger lobe may slightly overhang the Pyramidal mitral sclerites (Figs. 37, 38) represent asymfloor of the sella (e.g., Figs. 35A6, 36B3). With respect to the metrical and slightly helically twisted cones, up to 3 mm smaller one, the larger lobe is higher, approximately twice as long (measured from apex to the apertural margin) and up long and more than four times wider. The larger lobe carries to 2.5 mm wide (after Missarzhevsky in Rozanov and Misseveral (up to 15 in available specimens) variously expressed sarzhevsky 1966). The aperture is plicated subquadrate (in radial ridges and striations. The smaller lobe is ornamented smaller specimens) or subrectangular in outline (compare with longitudinal striations. Co-marginal folds are usually e.g., Figs. 37E, 38D with Figs. 37D1, 38C1). The apex is well expressed on the entire dorsal surface of sclerites. The slightly curved over the decrescent side of the sclerites (see ventral surface of the sclerite generally reproduces the relief explanation of morphological terms in comments to Fig.
Fig. 25 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 25. Hyolith conchs from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/36.7. A. Hyolithida sp. indet. 1, SMNH X 4656; lateral (A1), dorsal (A2), and apertural (A3) views. B. "Lenatheca groenlandica (Poulsen, 1932)"?, initial part, SMNH X 4640; apertural (B1), dorsal (B2), and lateral (B3) views. C. Microcornus? sp., SMNH X 4655; lateral (C1), apertural (C2), and dorsal (C3) views. D. Loculitheca? sp., SMNH X 4634; D1, oblique apical view, septum; D2, plan view of the conch. E–G. Conotheca cf. C. mammilata Missarzhevsky in Rozanov et al., 1969. E. SMNH X 4625; lateral view. F. SMNH X 4626; dorsal view. G. SMNH X 4627; lateral view. Scale bar 600 μm.
Fig. 24 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 24. Opercula of hyoliths Majatheca tumefacta Missarzhevsky in Rozanov et al., 1969 with phosphatised microstructure of the walls from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia. A. SMNH X 4607 (Mo 160465 in Kouchinsky 2000b: fig. 7), sample 1/7.8; inner (A 1), dorsal (A 2), and ventral (A 3) views. B. SMNH X 4608 (Mo 160467 in Kouchinsky 2000b: fig. 7), sample K1-3B; broken operculum with phosphatised canals preserved. Scale bar: A, 600 μm; B, 300 μm.
Fig. 55 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 55. Lobopodian Microdictyon cf. M. rhomboidale Bengtson, Matthews, and Missarzhevsky, 1986 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia compared to the paratype of M. rhomboidale from lower Cambrian of the Altai-Sayan Folded Area. A. Microdictyon cf. M. rhomboidale Bengtson, Matthews, and Missarzhevsky, 1986; SMNH X 4780, sample 7/54; A 1, A 2, general views of sclerite; →
Fig. 22 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 22. Hyolith conchs from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/36.7. A–E. Majatheca tumefacta Missarzhevsky in Rozanov et al., 1969, conchs with phosphatised microstructure of the walls. A. SMNH X 4600 (Mo 160442 in Kouchinsky 2000b: fig. 3); dorsal view. B. SMNH X 4601; apertural view. C. SMNH X 4602 (Mo 160441 in Kouchinsky 2000b: fig. 3); oblique lateral (C1) and dorsal C2) views. D. SMNH X 4603; dorsal view. E. SMNH X 4604; apertural (E1) and dorsal (E2) views; E3, septum in the apical part; E4 and E5, phosphatised fibrous bundles near the aperture. F–I. Allatheca? cf. A. corrugata Missarzhevsky in Rozanov et al., 1969. F. SMNH X 4609; lateral view. G. SMNH X 4610; lateral (G1), dorsal (G2), and apertural (G3) views. H. SMNH X 4611; dorsal (H1), apical (H2), and apertural (H3) views. I. SMNH X 4612; ventral view. Scale bar 600 μm, except C1, 300 μm; E3–E5, 200 μm.
Fig. 27 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 27. Hyolith conchs from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River and basal Kuonamka Formation, Malaya Kuonamka River, Anabar Uplift, Siberia. A–E, H. Conotheca cf. C. mammilata Missarzhevsky in Rozanov et al., 1969. A. SMNH X 4623, sample 7/29; longitudinal view on presumably dorsal side. B. SMNH X 4621, sample 7/27.5; longitudinal view on presumably dorsal side. C. SMNH X 4622, sample 7/27.5; longitudinal view. D. SMNH X 4663, sample 7/30; D1, transversal view from the apertural end; D2, longitudinal view. E. SMNH X 4620, sample 3/65; lateral (E1) and dorsal (E2) views. H. SMNH X 4624, sample 7/31.5; longitudinal view. F. Conotheca circumflexa Missarzhevsky in Rozanov et al., 1969, SMNH X 4629; F1, oblique longitudinal view showing transversal section; F2, longitudinal view. G, J. Linevitus? minutus Missarzhevsky in Rozanov and Missarzhevsky, 1966. G. SMNH X 4657, sample 7/31.5; lateral (G1), dorsal (G2), and apertural (G3) views. J. SMNH X 4658, sample 7/70; ventral side with growth increments. →
Fig. 21 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 21. Internal moulds of bivalved molluscs from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. Fordilla cf. F. sibirica Krasilova, 1977, SMNH Mo 167690; right lateral (A1), dorsal (A2), and oblique dorsal (A3) views; A4, close-up of A1. B. Undetermined fordillid bivalve, SMNH Mo 167691, left lateral view. C. Fragment of a larger specimen, interpreted herein as Fordilla cf. F. sibirica, SMNH Mo 167692, lateral view. Scale bar 1000 μm, except A4, 100 μm.
Fig. 40 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 40. Tommotiid Camenella plana (Missarzhevsky in Rozanov et al., 1969) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; mitral sclerites. A. D-form, SMNH X 4702, sample 6/2; A1, apical view; A2, view on the obplicate and decrescent sides; A3, view on the decrescent and plicate sides. B. L-form, SMNH X 4703, sample 6/2; B1, apical view; B2, oblique apical view; B3, view on the obplicate side; B4, view on the accrescent side. C. L-form, SMNH X 4704, sample 6/6.6; C1, oblique apical view; C2, accrescent side view; C3, oblique view on the basal aperture and plicate side; C4, oblique view on the accrescent and plicate sides. D. L-form, SMNH X 4705, sample 6/3.9; D1, oblique apical view on the accrescent side; D2, view on the obplicate side; D3, view on the accrescent side. E. D-form, SMNH X 4706, sample 6/6.8; E1, oblique view on the accrecent and obplicate sides; E2, oblique view on the obplicate and decrescent sides; E3, view on the accrescent side; E4, view on the decrescent side; E5, oblique apical view; E6, oblique apical view on the plicate side. Scale bar 600 μm.
Fig. 19 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 19. Comparison of internal moulds of two pelagiellid molluscs Pelagiella sp. 1 (A) and Pelagiella sp. 2 (B, C) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. SMNH Mo 167685; sub-apical (A1), apertural (A2), and spiral side (A3) views. B. SMNH Mo 167686; sub-apical (B1), apertural (B2), and spiral side (B3) views. C. SMNH Mo 167687; sub-apical (C1), umbilical side (C2), apertural (C3), and spiral side (C4) views. Scale bar 600 μm.
Fig. 29 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 29. Hyolith opercula Triplicatella spp. from lower Cambrian Emyaksin Formation, Malaya Kuonamka River and Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A, B. Triplicatella papilio sp. nov. A. SMNH X 4646, holotype, sample K1-3B; dorsal (A1), lateral (A2, A4), inner (A3), and ventral A5, note flattened rounded polygons at the base of the dorsal folds) views. B. SMNH X 4647, paratype, sample 7/70; dorsal (B1) and inner (B2) views. C. Triplicatella sinuosa Skovsted, Peel, and Atkins, 2004; SMNH X 4648, sample B-247; outer (C1), oblique ventral (C2), lateral (C3), and dorsal (C4) views. D. Triplicatella cf. T. peltata Skovsted, Peel, and Atkins, 2004; SMNH X 4649, sample 7/70; dorsal (D1), inner (D2), oblique inner (D3), and lateral D4) views. Scale bar 600 μm, except A1, A5, 300 μm.
Fig. 18 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 18. Pelagiellid mollusc Pelagiella sp. 1, external mould of the outer shell surface, from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. SMNH Mo 167683, sinusoidal course of transverse ribs of the shell exterior. B. SMNH Mo 167684; B1, transversal ribs fade out distally; B2, close-up of B1. Scale bar: A, B1, 300 μm; B2, 120 μm.
Fig. 17 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 17. Pelagiellid mollusc Pelagiella sp. 1 internal moulds from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. SMNH Mo 167679; sub-apical (A1), spiral side (A2), and apertural (A3) views; A4, close-up of A2, striation on the surface of internal mould. B. SMNH Mo 167680; umbilical side (B1) and apertural (B2) views. C. SMNH Mo 167681; oblique umbilical (C1) and umbilical side (C2) views. D. SMNH Mo 167682; umbilical side (D1), spiral side (D2), abapertural (D3), and oblique abapertural (D4) views. Scale bar 1200 μm, except A4, 300 μm.
Fig. 16 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 16. Mollusc Enigmaconus? pyramidalis sp. nov., paratypes, internal moulds from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/70. A. SMNH Mo 160422; upper (A 1) and lateral (A 2) views; A 3, view on the pegma-like structure; A 4, view on the side opposite to the pegma-like structure with shell deformation reflected on the internal mould. B. SMNH Mo 167677; upper (B 1) and lateral (B 2) views. C. SMNH Mo 167678; lateral (C ) and upper (C ) views. Scale bar 600 μm, except A , A , 200 μm.
Fig. 20 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 20. Pelagiellid mollusc Pelagiella sp. 2 from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia; sample K1-3B. A. SMNH Mo 160429, internal mould; spiral side (A1), apertural (A2), sub-apical (A3), and abapical (A4) views; A5, polygonal network on the spiral side arrowed in A4). B. SMNH Mo 167688; B1–B3, external mould of the outer shell surface. Scale bar: A1–A3, 600 μm; A4, B1, 300 μm; and A5, B2–B3, 120 μm.
Fig. 33 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 33. Halkieriid Halkieria sp. from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A. SMNH X 4667, sample 7/36.7; A1, plan view on the lower side of sclerite and its aperture; A2, oblique lateral view; A3, close-up of A2, fibrous microstructure. B. SMNH X 4666, sample 7/25.6; B1, lateral view; B2, plan view on the lower side of sclerite and its aperture. Scale bar 300 μm, except A3, 30 μm.
Fig. 54 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 54. Problematicum Fengzuella zhejiangensis He and Yu, 1992 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift and middle Lena River, Siberia. A. Planispiral sclerite, SMNH X 4776, sample 7/45; A1, lateral view on the sclerite; A2 and A3, oblique views; A4, close-up of overlapping growth increments. B. Curved sclerite, SMNH X 4778, sample 7/64; B1, lateral view of the fragment; B2, close-up of B3; B3, view on the cross-section of sclerite, in the upper part of B1. C. Curved sclerite, SMNH X 4777, sample 7/55.8; C1, lateral view on the sclerite; C2, transversal view. D. Curved sclerite, SMNH X 4779, sample 2001-11b; lateral (D1), oblique transversal (D2), and oblique apical (D3) views; D4, close-up of the apical end of sclerite. Scale bar: 200 μm, except D1–D3, 300 μm; A4, B2, D4, 60 μm.
Fig. 44 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 44. Tommotiids Lapworthella spp. from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River and Malaya Kuonamka River, Anabar Uplift, Siberia. A. Lapworthella cf. L. tortuosa Missarzhevsky in Rozanov and Missarzhevsky, 1966, SMNH X 4714, sample K6-8.1B; lateral (A1) and basal (A2) views. B. Lapworthella sp., SMNH X 4715, sample 6/4.9; lateral (B1) and apical (B2) views. C–H. Lapworthella dentata Missarzhevsky in Rozanov et al., 1969. C. SMNH X 4716, sample 7/60; apical view. D. SMNH X 4717, sample 7/60; oblique apical view. E. SMNH X 4719, sample 7/62; lateral (E1) and basal (E2) views. F. SMNH X 4718, sample 7/60; lateral view. G. SMNH X 4720, sample 7/64; apical (G1) and lateral (G2) views. H. SMNH X 4721, sample 1/5; lateral view on the fragment. Scale bar 300 μm, except H, 600 μm.
Fig. 14. Helcionellid mollusc Mellopegma uslonicum Parkhaev, 2004 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 14. Helcionellid mollusc Mellopegma uslonicum Parkhaev, 2004 internal moulds from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample B-247 (A), sample 7/70 (B–D). A. SMNH Mo 167672; lateral (A1), sub-apical (A2), and upper (A3) views. B. SMNH Mo 167671; sub-apical (B1), lateral (B2), and upper (B3) views. C. SMNH Mo 160410; lateral (C1), upper (C2), and sub-apical (C3) views. D. SMNH Mo 167612; lateral view. Scale bar 600 μm, except D, 300 μm.
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