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381 results for “Hokkaido”
Fig. 4 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan
Fig. 4. Temporal changes in ammonoid species richness, extinction, and origination rates in the Mikasa, Obira, and Oyubari areas. Abbreviations: CIUs, carbon isotopic units; CTBE, Cenomanian–Turonian boundary event; e., early; m., middle.
Fig. 2 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan
Fig. 2. Composite columnar sections in the Mikasa (A), Obira (B), and Oyubari (C) areas and the stratigraphical levels of macrofossil datum planes used in the present study. The shaded portion shows the Cenomanian–Turonian boundary event (CTBE). The molluscan fossil data are from Tanabe et al. (1977), Futakami (1986), Kurihara and Kawabe (2003), Funaki and Hirano (2004), Kurihara et al. (2007) and unpublished original data. The planktonic foraminiferal zonation and the CTBE are from Hasegawa (1997, 1999), Nishi et al. (2003), Kurihara (2006), and Uramoto et al. (2007, 2009). Abbreviations: Ka, Katsurazawa Formation; Hk, Hikagenosawa Formation; mdst, mudstone; sdst, sandstone; A. nipponicus, Actinoceramus nipponicus; Hel. helvetica, Helvetoglobotruncana helvetica; I. hobetsensis, Inoceramus hobetsensis nonsulcatus; I. kamuy, Inoceramus kamuy; W. arc., Whiteinella archaeocretacea.
Fig. 3 in Ammonoid biodiversity changes across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan
Fig. 3. Correlation of Upper Cretaceous δ13C stratigraphy of terrestrial organic materials in the Mikasa, Obira, and Oyubari areas, Japan and reference δ13C stratigraphy of carbonates in Europe (after Jarvis et al. 2006). Six carbon isotopic units (CIUs) were identified in the present study. Abbreviations: e., early; m., middle; PDB, Pee Dee Belemnite Standard; Aj, Acanthoceras jukesbrownei; An, Actinoceramus nipponicus; Ar, Acanthoceras rhotomagense; Ca, Calycoceras spp.; Cg, Calycoceras guerangeri; Ci, Cunningtoniceras inertme; Cu, Cunningtoniceras spp.; Cw, Collignoniceras woollgari; Fc, Fagesia catinus; Ih, Inoceramus hobetsensis; Ik, Inoceramus kamuy; Md, Mantelliceras dixoni; Mg, Metoicoceras geslinianum; Mn, Mammites nodosoides; Nj, Neocardioceras juddii; Wd, Watinoceras devonense.
Fig. 15. A in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 15. A juvenile specimen (UMUT MM30196) of Gigantocapulus sp., a mollusk of uncertain taxonomic affinity in lateral (A, B), apical (C), and posterior (D) views. E. Cross section through the shell displaying three layers: an outer, possibly fibrous prismatic (fp), a middle cross foliate (cf), and an inner layer of uncertain microstructure. F. Another section showing the same layers. G. Close up of the foliated structure, uppermost part of the layer consist of polygonal plates resembling broken semifoliated structure or detached tablets of nacreous structure.
Fig. 11 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 11. The hokkaidoconchid gastropod Hokkaidoconcha hikidai Kaim, Jenkins, and Warén, 2008 from the Campanian (Upper Cretaceous) Yasukawa seep site in Hokkaido, Japan. A. Holotype (UMUT MM29391) in lateral view. B. UMUT MM30183 in lateral (B1), apertural (B2), and apical (B4) views; B3, cross section through the shell displaying inner and outer prismatic (p) layers and middle cross−lamellar (cl) layer. C. UMUT MM30184 in apertural view (C1) and details of ornamentation (C2).
Fig. 10 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 10. The provannid gastropod Provanna nakagawensis sp. nov. from the Campanian (Upper Cretaceous) Omagari (A–D) and Yasukawa (E–G) seep sites in Hokkaido, Japan. A. Holotype (UMUT MM30178) in apertural (A1), lateral (A2), and apical (A3) views. B. UMUT MM30179 in apertural (B1), lateral (B2), and (B3) views. C. UMUT MM29362 in apertural view. D. UMUT MM30180 in lateral (D1, D2) and apical (D3) views. E. UMUT MM30181 in apertural view. F. UMUTMM30182in lateral (F1) and apical (F2) views. G. UMUT MM19363 in lateral (G1) and apical (G2) views.
Fig. 5 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 5. The turbinid gastropod Cantrainea yasukawensis sp. nov. from the Campanian (Upper Cretaceous) Yasukawa seep site in Hokkaido, Japan. A. UMUT MM30153 in lateral view. B. UMUT MM30154 in lateral view (B1) and another view (B2) showing inclination of the aperture. C. UMUT MM30155 in lateral view (C1) and another view (C2) showing inclination of the aperture. D. UMUT MM30156 in lateral view (D2) and another view (D1) showing inclination of the aperture. E. UMUT MM30157 in lateral view. F. Holotype (UMUT MM30158) in apertural (F1) and lateral (F2) views. G. UMUT MM30159 in lateral view. H. UMUT MM30160 in lateral view. I. UMUT MM30161 in lateral view (I1) and details of ornamentation (I2). J. UMUT MM30162, aggregation of three specimens and an operculum; J1, general view; J2, the operculum. K. UMUT MM30163 in lateral view (K1), shell microstructure (K2) including the inner nacreous (n) and fibrous prismatic (fp) layers, and details of shell ornamentation (K3).
Fig. 3 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 3. The acmaeid gastropod Serradonta omagariensis sp. nov. from the Campanian (Upper Cretaceous) Omagari (A, B, D) and Yasukawa (C) seep sites in Hokkaido, Japan. A. Holotype (UMUT MM29351) in apical (A1), lateral (A2), and anterior (A3) views. B. UMUT MM30145 in apical (B1), lateral (B2), and anterior views. C. UMUT MM30146 in apical (C1), lateral (C2), and posterior (C3) views. D. UMUT MM30147 in apical (D1) and lateral (D2) views; D3, illustrates layering of the shell while D4 is a cross section through shell showing two layers obliterated by diagenesis. Abbreviations: p, prismatic; cl, cross lamellar.
Fig. 4 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 4. The turbinid gastropod Homalopoma abeshinaiensis sp. nov. from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30148 in lateral (A1), latero−apical (A2), and apical (A3) views; A4, juvenile whorl; A5, details of shell ornamentation. B. UMUT MM30149 in apertural (B1), lateral (B2), and umbilical (B3) views. C. Holotype (UMUT MM30150) in lateral (C1, C2) and apical (C3) views. D. UMUT MM30151 in lateral view. E. UMUT MM30152 in apertural (E1), lateral (E2), and umbilical (E3) views.
Fig. 7 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 7. Turbinid gastropods of the genus Cantrainea from chemosynthesis−based communities. A–F. Cantrainea omagariensis sp. nov. from Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30165 in apical (A1), umbilical (A2), lateral (A3), and apertural views (A4). B. Holotype (UMUT MM30166) in apical (B1, B5), lateral (B2, B3), and latero−apical (B4) views. C. UMUT MM30167 in lateral (C1) and apical (C2) views. D. UMUT MM30168; details of inner lip (D1), apertural (D2) and umbilical (D3) views. E. UMUT MM30169 in lateral view. F. UMUT MM30170 in apical view. G. Recent Cantrainea nuda Okutani, 2001 from "depression B" of the Minami Ensei Knoll, Okinawa Trough, Japan (NSMT−Mo 73040) in lateral (G1), apical (G2), and umbilical (G3) views; G4, details of inner lip.
Fig. 14 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 14. Skeneimorph gastropod from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30193 in apertural (A1), lateral (A2), and apical (A3) views. B. UMUT MM30194 in lateral (B1), apertural (B2), and umbilical (B3) views. C. UMUT MM30195 in apical view (C1) and close up of initial whorls (C2).
Fig. 6 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 6. The turbinid gastropod Cantrainea yasukawensis sp. nov. from the Campanian (Upper Cretaceous) Yasukawa seep site in Hokkaido, Japan. A. UMUT MM30164 in lateral (A1), apertural (A2), and umbilical (A3) view; A4, details of inner lip. B. UMUT MM30154 in apical view. C. UMUT MM30156 in apical view. D. UMUT MM30159 in apical view. E. UMUT MM30157 in apical view. F. UMUT MM30155 in latero−apical view. G. UMUT MM30160 in apical view. H. Holotype (UMUT MM30158) in umbilical view. I. UMUT MM30153 in umbilical view.
Fig. 16 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 16. List of gastropod genera and their stratigraphical ranges in Cretaceous chemosynthesis−based associations. The genera in bold occur in the Campanian (Late Cretaceous) hydrocarbon seep sites in Nakagawa area. Note discrepancy in the composition of Lower and Upper Cretaceous gastropod associations. *Similar to Amberleya is Bathybembix that is known from chemosynthesis−based associations since Eocene and noted also in their Recent counterparts (Kiel and Goedert 2006b; Kiel et al. 2008b).
Fig. 9 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 9. The seguenzioid gastropod Cataegis nakagawensis sp. nov. from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. Holotype (UMUT MM30175) in apertural (A1), lateral (A2), and umbilical (A3) views. B. UMUT MM30176 in apical (B1), lateral (B2, B3), and latero−apical (B4) views. C. UMUT MM30177 in apical (C1), lateral (C2, C3), latero−umbilical (C4), and latero−apical (C5) views.
Fig. 2 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 2. The acmaeid gastropod Bathyacmaea cf. subnipponica Sasaki, Okutani, and Fujikura, 2003 from the Campanian (Upper Cretaceous) Omagari (A–C) and Yasukawa (D) seep sites in Hokkaido, Japan. A. NMM−228 in apical view. B. UMUT MM30143 in apical (B1), postero−lateral (B2), lateral (B3), and posterior views. C. UMUT MM30144 in apical (C1), lateral (C2), and anterior (C3) views. D. UMUT MM29353 attached to Cantrainea yasukawensis sp. nov. in apical (D1) and lateral (D2) view; D3 is a cross section through the shell showing three layers obliterated by diagenesis.
Fig. 13 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 13. Naticiform gastropod from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30189 in lateral (A1), latero−apical (A2), and apical (A3) views; A4, close up of the juvenile whorls, A5, close up of the initial whorl. B. UMUT MM30190 in lateral (B1), apertural (B2), and apical (B3) views. C. UMUT MM30191 in apertural (C1), lateral (C2), and apical (C3) views; C4, close up of the juvenile whorls in lateral view. D. UMUT MM30192 in lateral (D1), apical (D2), and umbilical (D3) views.
Fig. 8 in Gastropods from Late Cretaceous Omagari and Yasukawa hydrocarbon seep deposits in the Nakagawa area, Hokkaido, Japan
Fig. 8. The trochid gastropod Margarites sasakii sp. nov. from the Campanian (Upper Cretaceous) Omagari seep site in Hokkaido, Japan. A. UMUT MM30171 in apertural (A1) lateral (A2, A3), umbilical (A4), and apical (A5) views. B. UMUT MM30172 in apical (B1) and lateral (B2) views; B3, cross section through outer layer. C. Juvenile UMUT MM30173 in apical (C1), and lateral (C2–C4) views. D. Holotype (UMUT MM30174) in apical (D1) and lateral (D2–D4); note change in ornamentation in D4. E. NMM 229 in apical (E1), apertural (E2), and umbilical (E3) views.
Fig. 7 in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 7. Lucinidae from Cretaceous seep carbonates on Hokkaido, Japan. A, B. Nipponothracia yezoensis Kanie and Kuramochi, 1996 (Lucinidae) from the Cenomanian Kanajirisawa seep site on Hokkaido, Japan. A. Silicified specimen (UMUT MM 29541) showing the broad ligament (A1) and the edentulous hinge (A2). B. Internal mold (UMUT MM 29542) showing internal features, right and left valves (B1, B2), anterior part showing the elongate muscle scar (B3, arrow), posterior part with muscle scar and pallial line (B4). C. Nipponothracia ponbetsensis Kanie and Sakai, 1997, from the Albian Ponbetsu site in Mikasa City; specimen (UMUT MM 29543) showing the radial internal ribs (arrow). D, E. Indetermined lucinid from the Cenomanian Kanajirisawa seep site. D. Large specimen (UMUT MM 29544) with nearly circular outline. E. Internal mold (UMUT MM 29545) showing faint radial sculpture, arrow indicates impression of lateral tooth.
Fig. 8 in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 8. Geologic ranges of bivalve genera at Japanese seep deposits discussed herein. Dashed lines indicate range extensions outside Japan; *chemosymbiosis uncertain; **non−chemosymbiotic; ***chemosymbiosis only in some species, especially larger ones.
Fig. 6. Outline drawings showing internal features. A in Bivalves from Cretaceous cold-seep deposits on Hokkaido, Japan
Fig. 6. Outline drawings showing internal features. A. Thyasira tanabei sp. nov. B. Nipponothracia yezoensis (Kanie and Kuramochi, 1996). Not to scale.
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