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287 results for “Middle Ordovician”
Fig. 17 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 17 (previous page). Rioceratid and orthocerid cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A-C. Eosomichelinoceras borealis sp. nov., from bed PO 123.3. A. Specimen FMNH-P30278, lateral view with ventral, prosiphuncular side toward left. B. Specimen FMNH-P30279, lateral view with ventral, prosiphuncular side toward left. C. Specimen FMNH-20288, holotype, ventral view. D–F, I. Hinlopoceras tempestatis gen. et sp. nov., from bed PO 07. D. Specimen FMNH-P30359, lateral view with ventral, prosiphuncular side toward right. E. Specimen FMNH-30479, adult(?) body chamber, ventral view, prosiphuncular side. F. Specimen FMNH-P30362, strongly annulated fragment of body chamber. G–H, J. Hinlopoceras venti gen. et sp. nov. G. Specimen FMNH-P30262, from bed PO 07, lateral view with ventral, prosiphuncular side toward left. H. Specimen FMNH-P30266, from bed PO 7.5, lateral view with ventral, prosiphuncular side toward right. I. Specimen FMNH-P30360; note the nearly smooth adapical part of the fragment. J. Specimen FMNH-P30267, from bed PO 7.5, lateral view with ventral, prosiphuncular side toward left. Scale bar = 10 mm for all figures.
Fig. 55 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 55. Model of cephalopod habitat and faunal composition for three intervals (trilobite biozones V1a, V1b-c, V2b) of the depositional time of the Olenidsletta Member, Floian, Ordovician at Profilstranda (PO) section, Ny Friesland, Spitsbergen. Absolute water depth is estimated from septal implosion depths of cephalopods during V2b, from presence of photic zone biomarker signatures in all Olenidsletta Member samples (Lee et al. 2019), and from a global amplitude of eustatic sea level change of ca 80 m during the Floian (Haq & Schutter 2008).
Fig. 53 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 53. Cephalopod occurrences in sampled intervals of the Olenidsletta Member, Floian, Ordovician, Profilstranda (PO) section, Ny Friesland, Spitsbergen. 0 from Fortey (1980), 1 from Lehnert et al. (2013), 2 from Cooper & Fortey (1982). Grey shaded time interval marks nileid trilobite assemblage after Fortey & Barnes 1977. Section from Kröger et al. (2017). Symbols for organism groups as in Fig. 3.
Fig. 52 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 52. Single most parsimonious tree resulting from constrained analysis with the "concave" interpretation plotted against stratigraphy. Stratigraphic units (in grey boxes) are Ordovician stage slices after Bergström et al. (2009), modified by Rasmussen et al. (2019). Vertical range of stage slices represents absolute age (after Rasmussen et al. 2019). Abbrevations: Tr = Tremadocian; Fl = Floian; Dp = Dapingian; Dw = Darriwilian.
Fig. 51 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 51. Single most parsimonious trees of four separate cladistic analyses to test different a priori interpretations and hypotheses. A–B. Shape of siphuncular segments of critical species interpreted as "tubular". C–D. Shape of siphuncular segments of critical species interpreted as "concave". B–D. Analyses with several topological constraints enforced under an assumption of the monophyly of the Endocerida, Oncocerida, and Orthocerida (see methods for details). Critical species are: Ethanoceras solitudines sp. nov., Olenidslettoceras farmi gen. et sp. nov., Svalbardoceras sterna gen. et sp. nov., and Valhalloceras floweri Evans & King, 1990. Grey boxes indicate established order level classification of species in the analysis. Values above branches are Bremer supports (if> 1), values below branches are bootstrap supports (absolute and GC frequencies).
Fig. 54 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 54. Rank abundance diagram of cephalopod rich horizons of the V1 (black circles) and V2 (white circles) trilobite biozone with ranks of the six most important species listed.
Fig. 46 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 46. Litoceras profilbekkenense sp. nov., FMNH-P30329, holotype, from bed PO 131, from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Lateral view of left side of fragment of body chamber. B. Ventral view and whorl cross section with siphuncular perforation preserved. C. Lateral view of right side. Scale bar = 10 mm for all figures.
Fig. 42 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 42. Deltoceras beluga sp. nov., FMNH-P30321, holotype, from bed PO 07, from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. View from right side. B. Ventral view; note the deep u-shaped hyponomic sinus. C. View from left side. Scale bar = 10 mm.
Fig. 43 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 43. Diagrams of whorl expansion rate (WER) and whorl width index (WWI) of Deltoceras beluga sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. Solid lines connect measurements from individual specimens. Data of type specimens of D. planum Hyatt, 1894 from Ulrich et al. (1942). See Supp. file 2 for details of measurements
Fig. 44 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 44. Cross sections of coiled cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen with details of siphuncular position and impression zone of conch. A. Deltoceras beluga sp. nov., FMNH-P30322, from bed PO 07. B. Litoceras profilbekkenense sp. nov, FMNH-P30329, holotype, from bed PO 131, C. Trocholitoceras juvenicostatum Ulrich et al., 1942, FMNH-P30324, from bed PO 131. D. Trocholitoceras walcotti Hyatt, 1894, FMNH-P30328, from bed PO 131. Scale bars = 10 mm.
Fig. 41 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 41. Coiled cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Deltoceras beluga sp. nov., FMNH-P30322, from bed PO 07. B. Trocholitoceras walcotti Hyatt, 1894, FMNH-P30328, from bed PO 131. C-D. Cycloplectoceras hinlopense sp. nov., FMNH-P30327, holotype, from bed PO 131. Scale bar = 10 mm for all figures.
Fig. 47 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 47. Diagrams of whorl expansion rate (WER), whorl width index (WWI), and relative depth of impression zone (IZR) of Trocholitoceras walcotti Hyatt, 1894, T. latum Ulrich et al., 1942, and Litoceras profilbekkenense sp. nov. Measurements from specimens from the Olenidsletta Member (Olen. Mbr), Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen, and from type specimens based on Ulrich et al. (1942). See Supp. file 2 for details of measurements.
Fig. 50 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 50. Median sections of phragmocones of oncocerids from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Olenidslettoceras farmi gen. et sp. nov., FMNH-P30334, holotype, from bed PO 123.3, see Fig. 8C for interpretation. B. Vallhalloceras floweri Evans & King, 1990, FMNH-P30340, see Fig. 8B for interpretation. Scale bars = 1 mm for both figures.
Fig. 45 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 45. Cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Nyfrieslandoceras bassleroceroides gen. et sp. nov., FMNH-P30353, holotype, from bed PO 131. A. Ventral view, prosiphuncular side. B. Lateral view with ventral, prosiphuncular side toward the left. C–D. Order, gen. et sp. indet. A, FMNH-P30354, from bed PO 131. C. Dorsal (?) view. D. Lateral view, with dorsal (?), antisiphuncular side toward the right. E–F. Estonioceratid gen. et sp. indet. A., FMNH-P30342, from bed PO 7.5. E. Lateral view with ventral, prosiphuncular side toward the right. F. adoral view with preserved siphuncular perforation. G. Order, gen. et sp. indet. B, FMNH-P30424, from bed 4.8., lateral view with ventral, prosiphuncular side toward the right. Scale bar = 10 mm for all figures.
Fig. 39 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 39. Diagrams of spacing of ornamentation, angle of expansion, and relative chamber length of Eosomichelinoceras borealis gen. et sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements.
Fig. 38 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 38. Diagram of the spacing of the annulation in Protocycloceras minor sp. nov. from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements.
Fig. 37 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 37. Longitudinal cross sections of protocycloceratid cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Protocycloceras lamarcki (Billings, 1859). A. Specimen FMNH-P30418, approximal dorso-ventral median section with details of heavily recrystallized siphuncle and sepal necks, showing concave siphuncular segments. B. Specimen FMNH-30409, apical fragment of phragmocone with cameral deposits and siphuncle with concave segments and orthochoanitic septal necks. C. Protocycloceras minor sp. nov., FMNH-P30411, holotype, with poorly preserved details; siphuncle with nearly tubular segments and probably short orthochoanitic septal necks. Scale bar = 2 mm for all figures.
Fig. 36 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 36. Protocycloceratid cephalopods from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A. Protocycloceras sp. FMNH-P30417, lateral view, from bed PO 123.3. B–C, E–H. Protocycloceras minor sp. nov. B, E–F. Specimen FMNH-P30411, holotype, from bed PO 131. B. Ventral view, prosiphuncular side. C. Specimen FMNH-P30412, from bed PO 131, with details of ornamentation well preserved. D. Catoraphiceras sp., FMNH-P30425, from bed PO 131, oblique lateral view. E. Adoral view of holotype with septal perforation visible. F. Fragment of holotype with chamber spacing G. Specimen FMNH-P30413 showing the shape of the septal curvature, dorsal view, antisiphuncular side. H. Specimen FMNH-P30410, with conch surface well preserved. I. Protocycloceras lamarcki (Billings, 1859), FMNH-P30418, from bed PO 04, with poorly preserved conch surface. Scale bars = 5 mm.
Fig. 48 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 48. Trocholitoceras juvenicostatum Ulrich, Foerste, Miller & Furnish, 1942, from bed PO 131, Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. A–B. Specimen FMNH-P30323. A. Adoral view with siphuncular perforation preserved. B. Lateral view of fragment of body chamber with outer shell and ornamentation partly preserved. C. Specimen FMNH-P30330, lateral view with distinctive ribs. Scale bar = 20 mm for all figures.
Fig. 34 in Early-Middle Ordovician cephalopods from Ny Friesland, Spitsbergen - a pelagic fauna with Laurentian affinities
Fig. 34. Diagrams of relative conch width, relative chamber length, and relative siphuncular diameter of Buttsoceras buldrebreenensis sp. nov., from the Olenidsletta Member, Floian, Ordovician, Profilstranda section, Ny Friesland, Spitsbergen. See Supp. file 1 for details of measurements.
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