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287 results for “Middle Ordovician”
Fig. 2 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 2. Map of Northern Europe showing position of the studied section E 60.01053054594174, N 32.56286132296759 (asterisk) at the mouth of the Lynna River (Leningrad Region, Russia).
Fig. 1 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 1. Generalized stratigraphic column of the Middle Ordovician section from the western Leningrad Region (after Dronov 1997).
Fig. 8 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 8. Moulds of outer epithelial cells in gonambonitid brachiopods from the Volkhovian (A) and Kunda (B, C) regional stages, Darriwilian, Middle Ordovician of the Leningrad Region, Russia. A. Antigonambonites planus (Pander, 1830), PIN 4921/805, ventral valve with ridges of mantle canals system bearing cell molds (fragment of Fig. 5H2). B, C. Anchigonites conulus Öpik, 1939, dorsal adductor scars. B. PIN 4921/912, dorsal muscle field (B1), cell moulds covering adductor scars (B2–B4). C. PIN 4921/901, posterior wall of deeply impressed adductor scar with cell moulds.
Fig. 4 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 4. Gonambonitid brachiopod Anchigonites conulus Öpik, 1939 from the Kunda regional stage, Darriwilian, Middle Ordovician of the Leningrad Region, Russia; ontogenetic series of dorsal valves. A. PIN 4921/528, 2.2 mm wide valve in interior (A1) and exterior (A2) views, fragment of ornamentation (A3). B. PIN 4921/689, 2.8 mm wide valve in general view (B1), umbone (B2). C. PIN 4921/688, 3 mm wide valve in general view (C1), umbone (C2). D. PIN 4921/897, 3 mm wide valve interior (D1), cardinalium (D2). E. PIN 4921/913, 3.3 mm wide valve in posterior view (E1), incomplete chilidium (E2). F. PIN 4921/912, interior of 3.5 mm wide valve. G. PIN 4921/917, interior of 4 mm wide valve. H. PIN 4921/526, 5.6 mm wide valve showing strong vertical growth in anterior (H1) and general (H2) views. I. PIN 4921/182, interior of 6 mm wide broken valve. J. PIN 4921/907, adductor scars of 7 mm wide valve. K. PIN 4921/906, 7.4 mm wide valve in posterior (K1) and interior (K2) views, fragment of inner surface near anterior margin (K3), incomplete chilidium (K4).
Fig. 3 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 3. Gonambonitid brachiopod Anchigonites conulus Öpik, 1939 from the Kunda regional stage, Darriwilian, Middle Ordovician of the Leningrad Region, Russia, ontogenetic series of ventral valves. A. PIN 4921/798, 3.5 mm wide valve in exterior (A1) and interior (A2) views. B. PIN 4921/891, 5 mm wide valve with sealed pedicle tube in interior view (B1), spondylium (B2), apical disc infilling the delthyrium apex (B3). C. PIN 4921/911, 4.2 mm wide valve in lateral (C1), ventral (C2), and posterior (C3) views. D. PIN 4921/908, 7 mm wide valve in general (D1) and lateral (D2) views. E. PIN 4921/807, 5.5 mm wide valve in general view (E1), spondylium with rudiment lateral septa (E2). F. PIN 4921/895, 8.3 mm wide valve in general (F1) and lateral (F2) views. G. PIN 4921/913, broken apical disc with imprint of the substrate, general view (G1), enlarged surface of the attachment region (G2).
Fig. 7 in Morphology and ontogeny of some Middle Ordovician gonambonitid brachiopods from Baltoscandia
Fig. 7. Latex casts of the gonambonitid brachiopod Anchigonites heintzi Öpik, 1939 from the Kunda regional stage, Middle Ordovician of Krekling, Norway. A. GIT 801-3, ventral valve. B. GIT 801-7, dorsal valve. Casts prepared by Madis Rubel (University of Tartu, Geology Department, Estonia).
Fig. 2 in Asterozoan pedicellariae and ossicles revealed from the Middle Ordovician of Baltica
Fig. 2. Asterozoan pedicellariae (A–D) and ossicles from (E–H) from the Mishina Gora section, Middle Ordovician. A. TUG 1611-1, external view. B. TUG 1611-2, internal view. C. TUG 1611-3, internal view. D. TUG 1611-4, external view. E. TUG 1611-5 asterozoan disk (?) ossicle. F. TUG 1611-6 asterozoan interradial (?) ossicle. G. TUG 1611-7 asterozoan interradial (?) ossicle. H. TUG 1611-8 asterozoan disk (?) ossicle. Scale bars 200 μm.
Fig. 1 in Asterozoan pedicellariae and ossicles revealed from the Middle Ordovician of Baltica
Fig. 1. Location map (A), excerpt of the simplified geological map of the area (B), plan of the quarry (C), and stratigraphy of the Mishina Gora section 1 (D). Abbreviations: O, Ordovician; S, Silurian; D, Devonian outcrop area.
Fig. 1 in First report on the occurrence of Neseuretinus and Ovalocephalus trilobites in the Middle Ordovician of Iran
Fig. 1. Geographical map (A) showing the position of fossil locality in the Derenjal Mountains north of Tabas and stratigraphical column (B) through Section B in the upper part of the Shirgesht Formation, showing stratigraphical ranges of selected trilobite, ostracod, and conodont species (after Ghobadi Pour et al. 2006). The dashed line for Neseuretinus birmanicus indicates the position of specimens collected lose on the surface and therefore only in approximate stratigraphical position.
Fig. 10 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 10. Longitudinal section of Archigeisonoceras picus sp. nov., NRM−Mo 14455, Limbata−Limestone, Resmo (Öland) (A) and Nilssonoceras nilssoni (Boll, 1857), NRM−Mo 3328, Segerstad−Limestone, Hulsterstadkanalen (Öland) (B) showing the development of cameral and endosiphuncular deposits (× 0.55).
Fig. 6 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 6. Schematic sketches of the cross section of the shell. Shell ornamentation of Orthoceras (A), Nilssonoceras (B), and Kinnekulloceras (C) (aperture to the right).
Fig. 3 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 3. Variation of the body chamber impressions in adult Orthoceras bifeovatum Noetling (right flanks, apex down, × 0.7). A. NMB C. 5383, coll. Remelé 1241. B. NRM−Mo 154270. C. NMB C. 5384, coll. Remelé. D. NRM−Mo 154268.
Fig. 2 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 2. Longitudinal sections of the apical parts of the phragmocone of Orthoceras. A. Orthoceras sp. from Czerwińsk near Kwidzyn, N Poland, NMB C. 5381, Lasnamägian (apical diameter 3.3 mm). B. Orthoceras regulare from Bydgoszcz, Poland, NMB C. 5382(apical diameter 4.5 mm). Endosiphuncular and cameral deposits dotted.
Fig. 9 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 9. Longitudinal section of the siphuncle of Nilssonoceras latisiphonatum sp. nov., NRM−Mo 158037, holotype (diameter of the siphuncle 10 mm). The siphuncle shows different areas of sparite (dotted: fin grained calcite, medium hatched: medium grained sparite, coarsely hatched: coarse grained sparite) which are interpreted as residues of the spherulitic prismatic layer of the connecting ring (dotted), the endosiphonal annuli (medium hatched) and the endosiphuncular lining (coarsely hatched).
Fig. 5 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 5. Histogram of the entire number of observed Orthoceras (n = 66) classified by the expansion rate (e). The frequency peak between e = 0.04 (a = 2.3°) – 0.05 (a = 0.9°) represents O. bifeovatum Noetling and O. regulare Schlotheim, the frequency peak between e = 0.09 (a = 5.1°) – 0.1 (a = 5.7°) represents O. scabridum Angelin.
Fig. 8 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 8. Histogram of the entire number of observed specimens of Nilssonoceras nilssoni (Boll) (n = 130) classified by the expansion rate (e).
Fig. 4 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 4. Variation of the body chamber impressions and aperture in adult Orthoceras scabridum Angelin (A–D, × 0.8; E, × 1). A. NRM−Mo 3140. B. NRM−Mo 155513. C. NRM−Mo 155520. D. NRM−Mo 154202. E. NRMMo 155508.
Fig. 7 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 7. Longitudinal section of the apical part of the phragmocone of Archeisonoceras folkeslundense sp. nov. (NRM−Mo 155476, holotype, diameter of the shell 10 mm).The cameral and endosiphuncular deposits are dotted. Note the short cyrtochoaniticseptal necks.
Fig. 12 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 12. Polished sections of the siphuncle. A. Archigeisonoceras folkeslundense sp. nov., NRM−Mo 3223, Källa (Öland), showing the structure of the connectig ring and the layered structure of the endosiphuncular annuli, × 35. B. Archigeisonoceras picus sp. nov., NRM−Mo 14455, Resmo (Öland), apical part of the phragmocone, × 8. C. Nilssonoceras nilssoni (Boll), NRM−Mo 3328, Hulterstad Kanalen (Öland), middle part of the phragmocone, × 12. D. Kinnekulloceras kinnekullense (Foord), NRM−Mo 155245, Utby (Dalarna), × 12. E. Archigeisonoceras picus sp. nov., NRM−Mo 14455, Resmo (Öland), middle part of the phragmocone, × 8. F. Nilssonoceras nilssoni (Boll), NRM−Mo 3328, Hulterstad Kanalen (Öland), apical part of the phragmocone with irregular endosiphuncular annuli and lining and strong cameral deposits, × 12. G. Arionoceras lotskirkense sp. nov., NRM−Mo 3296, Hällar (Öland), × 25.
Fig. 11 in Revision of Middle Ordovician orthoceratacean nautiloids from Baltoscandia
Fig. 11. Polished sections of the siphuncle. A. Ctenoceras schmidti (Noetling), NRM−Mo 160668b, Kandel (Estonia). Note the calcified connecting ring and the thin lining of a sphaerolitic−prismatic layer at the outer surface of the connecting ring, × 25. B. Archigeisonoceras folkeslundense sp. nov., NRM−Mo 3223, Källa (Öland). Note the porous structure of the calcified connecting ring and the sphaerolitic−prismatic layer, × 10. C. Orthoceras scabridum Angelin, NRM−Mo 154771, Södre Bäck (Öland), × 30. D. Plagiostomoceras fragile sp. nov., NRM−Mo 160559, Gardslösa (Öland), × 6.3. E. Archigeisonoceras repplingense sp. nov., NRM−Mo 3285 not numbered, Hälludden (Öland), note the asymmetrical development of the endosiphuncular annuli, × 18. F. Archigeisonoceras repplingense, NRM−Mo 3284, Hälludden (Öland), apical part, × 18. G. Archigeisonoceras repplingense sp. nov., NRM−Mo 3293, Torp (Öland), note the thin sphaerolithic−prismatic layer of the connecting ring, × 22.
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