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306 results for “Early Cambrian”
Fig. 62. Eocrinoid brachiolar plates A in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 62. Eocrinoid brachiolar plates A (A–H) and associated thecal-plates (I–L) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/42.3. A. Twisted, elongated, brachiolar-plate, SMNH Ec 31488, A1, view of longitudinal articulation (proximal articulation to the base); A2, lateral, oral view (proximal articulation to the base); A3, close-up of proximal articulations with depression surrounding the aboral canal (to the left) and oral groove on the left (composed of half median-furrow and lateral depression to the right); A4, oblique view of distal (upward) and longitudinal articulations. B. Plates articulated longitudinally with irregularly undulose proximal and distal articulation facets, SMNH Ec 314899; B1, oral view with aboral canal visible upward due to the slightly eroded floor of oral, median furrow (proximal articulation to the base); B2, oblique view of proximal articulation with crescentic concavity (aboral canal most probably secondary filled) and distinct tripartite food-groove. C. Oral view of 2 plates articulated longitudinally with undulose, offset proximal (to the base) and distal articulations, SMNH Ec 31490. D. Distal view of isolated brachiolar plates with concave articulation, wide oral-groove (upper-left) and large, oval aboral-groove (upper-right), SMNH Ec 31491. E. Flat and elongated brachiolar plate, SMNH Ec 31492; E1, oblique view of proximal articulation (aboral canal to the right); E2, oblique aboral view of the longitudinal articulation (made of two longitudinal ridges delimiting aboral canal; to the right), the flat distal (to the top) and the angular proximal articulation (to the base). F. Flat brachiolar-plate in lateral (median) view with flat longitudinal articulation-ridge (aboral canal to the right), SMNH Ec 31493. G. Two articulated brachiolar plates (to the middle) delimiting a large, oval aboral-canal partly preserved in diagenetized matrix with thecal plates of unknown affinity (to the top and base), SMNH Ec 31494. H. Articulated (in the middle, aboral canal filled by exogenous grain) and isolated brachiolar plates partly preserved in diagenetized matrix, SMNH Ec 31495. I–L. Rounded to polygonal, concavo-convex thecal plates of unknown affinity. I. Outer view of plates partly preserved in matrix, SMNH Ec 31496. J, K. Outer views of plates ornamented with meshwork, SMNH Ec 31497 and SMNH Ec 31498, respectively. L. SMNH Ec 31499, slightly broken, rounded thecal-plates; L1, outer-surface ornamented with tubercles; L2, inner and L3, lateral view showing the smouth concave inner surface. Scale bar: 600 μm, except I, 1200 μm.
Fig. 61 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 61. Carapace fragment of a?bradoriid from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; SMNH Ar 63462, sample 7/27.5. A. View on the outer surface. B. View on the inner surface. C. Oblique view on the outer surface. D. Oblique view on the inner surface. Scale bar 600 μm.
Fig. 58 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 58. Bradoriids Mongolitubulus spinosus (Hinz, 1987) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River and basal Kuonamka Formation, Malaya Kuonamka River, Anabar Uplift, Siberia, fragments of spines. A. SMNH Ar 63450, sample 7/55; A1, lateral view; A2, close-up of A1 showing ornamentation; A3, oblique basal view; A4, oblique transversal view on the apical end of the fragment. B. SMNH Ar 63452, sample 1/9; lateral view. C. SMNH Ar 63453, sample 1/9; lateral view. D. SMNH Ar 63451, sample 7/70; D1, lateral view; D2, oblique transversal view on the basal end of the fragment. Scale bar: 300 μm, except A1, 120 μm; A2, 60 μm.
Fig. 57 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 57. Paleoscolecids Hadimopanella knappologica (Bengtson, 1977) from lower Cambrian Emyaksin Formation, Malaya Kuonamka River and Bol'shaya Kuonamka River, Anabar Uplift, Siberia; disarticulated sclerites. A. SMNH X 4784, sample 3/61.5; A1, view on the outer surface; A2, oblique lateral view; A3, oblique basal views on the sclerite. B. SMNH X 4785, sample 3/61.5; B1, view on the outer surface; B2, oblique lateral view. C. SMNH X 4786, sample 3/60; view on the outer surface. D. SMNH X 4787, sample 3/60; view on the outer surface. E. SMNH X 4788, sample 3/60; view on the outer surface. L. SMNH X 4795, sample 7/62; view on the outer surface. M. SMNH X 4796, sample 7/62; view on the outer surface. N. SMNH X 4797, sample 7/62; view on the outer surface. F. SMNH X 4789, sample 7/60; view on the outer surface. G. SMNH X 4790, sample 7/60; view on the outer surface. H. SMNH X 4791, sample 7/60; view on the outer surface. I. SMNH X 4792, sample 7/60; view on the outer surface. J. SMNH X 4793, sample 7 /60; view on the outer surface. K. SMNH X 4794, sample 7/60; view on the outer surface. Scale bar: 120 μm, except A, B, 60 μm.
Fig. 43. Tommotiid Camenella aff. C in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 43. Tommotiid Camenella aff. C. garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966, sellate sclerites from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A. L-form, SMNH X 4710, sample 7/31.9; plan (A1), apical (A2), and marginal (A4) views; A3, lateral view on the larger lobe; A5, lateral view on the smaller lobe. B. D-form, SMNH X 4711, sample 6/18; apical (B1) and plan (B2) views; B3, lateral view on the larger lobe; B4, lateral view on the smaller lobe. C. L-form, SMNH X 4712, sample 7/16; plan (C1) and apical (C2) views; C3, lateral view on the larger lobe; C4, lateral view on the smaller lobe. D. D-form, SMNH X 4713, sample 7/16; D1, apical view; D2, lateral view on the larger lobe. Scale bar: A, C, 1200 μm; B, D, 600 μm.
Fig. 47 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 47. Problematicum Rhombocorniculum cancellatum (Cobbold, 1921) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A, C, F. Slender sclerites, sample 7/55. A. SMNH X 4748; A2, proximal end of sclerite in A1. C. SMNH X 4749; C2, proximal end of sclerite in C1. F. SMNH X 4750; lateral view. B, D, E. Sclerites of transitional morphology, sample 7/55. B. SMNH X 4751; B2, proximal end of sclerite in B1. D. SMNH X 4752; lateral view. E. SMNH X 4753; lateral view. G, H. Sclerites, sample 7/55.8. G. Broad sclerite, SMNH X 4754; G1, view on the broader side; G2, lateral view. H. Basal part of sclerite, SMNH X 4755. Scale bar: 300 μm, except A2, B1, C2, 60 μm; H, 120 μm. usually somewhat narrowing towards its base, can bear one to that described for R. insolutum (see above). In many cases, or several stacked rounded structures (Fig. 48A), similar to however, the tubercles are nearly perpendicular to the wall growth increments. These rounded structures can either be (Figs. 46A1, A2, 47A2, C2, H). The lumen is surrounded by smooth or carry a smoothened sculpture. The exterior surface relatively thick walls. The wall contributes to at least half of of the sclerite is covered with a cancellate sculpture, similar the sclerite width between the broader sides and significantly
Fig. 53 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 53. Protoconodonts from lower Cambrian basal Kuonamka Formation, Malaya Kuonamka River and Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia. A–D. Gapparodus bisulcatus (Müller, 1959), sample 1/9. A. SMNH X 4764; A 1, view on the longitudinally concave side and basal opening of sclerite; A 2, lateral view. B. SMNH X 4765; B 1, lateral view; B 2, view on the longitudinally concave side. C. SMNH X 4766; C 1, lateral view; C , oblique view on the longitudinally concave side and basal opening of sclerite; C , view on the longitudinally concave side. D. SMNH X 4767; D 1, lateral view; D 2, close-up of basal part of D 1. E. Amphigeisina danica (V. Poulsen, 1966), SMNH X 4763; sample 1/9; E 1, view on the basal →
Fig. 42 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 42. Tommotiid Camenella admiranda (Missarzhevsky in Rozanov and Missarzhevsky, 1966) from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; fragment of mitral sclerite, SMNH X 4709, sample K6-5.8B; apical (A) and lateral (B) views. Scale bar 600 μm.
Fig. 39 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 39. Tommotiid Camenella cf. C. garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sellate sclerites. A. D-form, SMNH X 4700, sample 6/2; plan (A1), apical (A2), and marginal (A3) views; A4, lateral view on the larger lobe; A5, lateral view on the smaller lobe. B. L-form, SMNH X 4701, sample 6/3.9; plan (B1), marginal (B2), and apical (B3) views. Scale bar 600 μm.
Fig. 38 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 38. Tommotiid Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; mitral sclerites, D-forms. A. SMNH X 4696, sample 6/2; A1, apical view; accrescent (A2), plicate (A3), obplicate (A4), and decrescent (A5) sides views. B. SMNH X 4697, sample 6/0.3; apical view. C. SMNH X 4698, sample K6-4B; C1, apical view; obplicate (C2), accrescent (C3), decrescent (C4), and plicate C5) sides views. D. SMNH X 4699, sample K6-4B; view on the aperture and decrescent side. Scale bar 600 μm.
Fig. 52 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 52. Problematicum Rhombocorniculum insolutum Missarzhevsky in Missarzhevsky and Mambetov, 1981 from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia; SMNH X 4741; sample 3/42. A. View on the convex (dorsal?) side. B. Lateral view. C. View on the proximal end with broad lumen. D. Apical end with tubular microstructure and central lumen. E. External ornamentation. F. Close-up of E, longitudinal fibres. Scale bar: A–C, 300 μm; D, 30 μm; E, 60 μm; F, 15 μm.
Fig. 37 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 37. Tommotiid Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; mitral sclerites, L-forms. A. SMNH X 4691, sample K6-4B; apical view, with the decrescent, accrescent, plicate, and obplicate sides up, down, right, and left (respectively). B. SMNH X 4692, sample 6/0.3; B1, view on the accrescent side; B2, apical view. C. SMNH X 4693, sample 6/1.8; C1, apical view; accrescent (C2), decrescent (C3), plicate (C4), and obplicate (C5) sides views. D. SMNH X 4694, sample 6/1.8; D1, apical view; accrescent (D2), obplicate (D3), decrescent (D4), and plicate (D5) sides views. E. SMNH X 4695; sample 6/3.9; view on the inner surface of sclerite. Scale bar 600 μm.
Fig. 34 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 34. Chancelloriids Chancelloria spp. from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River and Malaya Kuonamka River, Anabar Uplift, Siberia. A. SMNH X 3416, sample 6/66.2, internal mould of a disarticulated ray with aciculate remains of presumably original microstructure of the wall; lateral (A 1 ) and basal (A 2 ) views. B–D. Articulated sclerites of 6+1 type. B. SMNH X 4672, sample 7/70; lateral (B 1 ) and external (B 2 ) views. C. SMNH X 4673, sample 7/70; basal view. D. SMNH X 4674, sample K1-3B; basal view. E, J, N. Internal moulds of basal parts of larger disarticulated sclerites; sample 7/70. E. SMNH X 4669; basal view. J. SMNH X 4670; oblique basal view. N. SMNH X 4671; external view. F. Articulated sclerites of 4+0 type, SMNH X 4681, sample 7/70; external view. G–I. Articulated sclerites of 7+1 type. G. SMNH X 4675, sample 7/70; lateral view. H. SMNH X 4676, sample K1-3B; external view. I. SMNH X 4677, sample K1-3B; basal view. K–M. Articulated sclerites of 5+0 type. K. SMNH X 4678, sample 7 /34.7; lateral view. L. SMNH X 4679, sample K1-3B; lateral view. M. SMNH X 4680, sample K1-3B; external view. Scale bar 600 μm, except A, 300 μm.
Fig. 56 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 56. Lobopodian Microdictyon sp. from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/34.7. A. Outer surface of the fragment, SMNH X 4782; A 1, close-up of A 2; A 2, view on the outer surface of sclerite; A 3, oblique view on the lower margin of sclerite. B. SMNH X 4783; B , B , general views of the fragment; B , inner surface; B , close-up of the edge of sclerite. Scale bar: 200 μm, except A , B , 60 μm.
Fig. 45 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 45. Problematic cones from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 6/3.9. A. SMNH X 4722; A1, view on the inner surface; A2 and A3, lateral views. B. SMNH X 4723; B1, B2, B5, and B6, lateral views; B3, view on the inner surface; B4, closeup of B1 showing ornamentation. Scale bar: A, B2, 600 μm; B1, B3, B5, B6, 200 μm; B4, 60 μm.
Fig. 31 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 31. Hyolith opercula Parkula cf. P. esmeraldina Skovsted, 2006 from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia; sample K1-3B. A. SMNH X 4660; inner (A1), oblique ventral (A2), lateral (A3, A4), and dorsal (A5) views. B. SMNH X 4661; lateral (B1), dorsal (B2), and inner (B3) views. Scale bar 300 μm.
Fig. 41 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 41. Tommotiid Camenella sp. from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; mitral sclerites, sample 6/3.9. A. L-form, SMNH X 4707; A1, oblique apical view; A2, decrescent side; A3, plicate side; A4, aperture; A5, microstructure of the wall; A6, close-up of A5. B. D-form, SMNH X 4708; accrescent side (B1) and apical (B3) views; B2, oblique view on the accrescent and obplicate side. Scale bar: A1–A4, B1, 1200 μm; A5, 120 μm; A6, 30 μm; B2, B3, 600 μm.
Fig. 30 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 30. Hyolith opercula from lower Cambrian Emyaksin Formation, Malaya Kuonamka River, Anabar Uplift, Siberia; sample K1-3B. A. Operculum type 1, SMNH X 4650; dorsal (A 1), inner (A 2), and lateral (A 3) views. B, F. Operculum type 2. B. SMNH X 4651; dorsal (B 1), lateral (B 2), inner (B 3), and oblique ventral (B 4) views. F. SMNH X 4652; lateral (F 1), inner (F 2), and ventral (F 3) views. C–E. Operculum type 3, SMNH X 4653 (C), SMNH X 4654 D), and SMNH X 4668 (E); inner (C, D , E) and oblique lateral (D ) views. Scale bar 600 μm.
Fig. 50 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 50. Problematicum Rhombocorniculum insolutum Missarzhevsky in Missarzhevsky and Mambetov, 1981 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sample 7/19. A. Sclerite with twinned apical parts, SMNH X 4727; A1, oblique lateral view; A2, close-up of A1; A3, close-up of basal end showing microstructure; A4–A6, lateral views; A7, oblique apical view. B. SMNH X 4728; lateral view. C. SMNH X 4729; C1, general view; C2, view on the transversally compressed sclerite. D. SMNH X 4730; D1 and D2, lateral views. Scale bar: A1, A2, A4, A5, A7, 120 μm; A3, 30 μm; A6, B–D, 300 μm.
Fig. 36 in An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia
Fig. 36. Tommotiid Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 from lower Cambrian Emyaksin Formation, Bol'shaya Kuonamka River, Anabar Uplift, Siberia; sellate sclerites, D-forms. A. SMNH X 4685, sample K6-4B; plan (A 1), apical (A2), and marginal (A 4) views; A 3, lateral view on the larger lobe; A 5, lateral view on the smaller lobe. B. SMNH X 4686, sample 6/3.9; plan (B 1), marginal (B 2), and apical (B 3) views; B 4, lateral view on the larger lobe; B 5, lateral view on the smaller lobe. C. SMNH X 4687, sample 6/0.3; plan (C 1), apical (C 2), and marginal (C 3) views; C 4, lateral view on the larger lobe; C 5, lateral view on the smaller lobe. D. SMNH X 4689, sample 6/1.8; marginal (D 1), plan (D 2), and apical (D 3) views; D 4, lateral view on the smaller lobe; D 5, lateral view on the larger lobe. E. SMNH X 4688, sample 6/0.3; marginal (E 1), apical (E 2), and plan (E 3) views. F. SMNH X 4690, sample 6/1.8; F 1, lateral view on the smaller lobe; F 4, lateral view on the larger lobe; marginal (F 2), plan (F 3), and apical (F 5) views. Scale bar 600 μm, except A, 1200 μm.
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