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Palynomorphs from the Santonian Uge Member of the Taneichi Formation, Northeast Japan


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Title: Palynomorphs from the Santonian Uge Member of the Taneichi Formation, Northeast Japan
Authors: Takahashi, Kiyoshi / Sugiyama, Ryozo
Issue Date: Jan-1990
Citation: 長崎大学教養部紀要. 自然科学篇. 1990, 30(2), p.133-573
Abstract: The basal Uge Member of the Taneichi Formation consisting mainly of terrigenous sediments, viz. basal conglomerate, rhyolitic tuff, sandstones, coaly shales etc, was palynologically studied. A total of 303 species of palynomorphs which consist of 115 spores, 90 gymnospermic pollen, 3 gymnospem-angiosperm incertae sedis, 85 angiospermic pollen, 7 phytoplankton and 3 incertae sedis were described and illustrated. The following forms are new : Appendicisporites gigantiformis n. sp., A. kanukaensis n. sp., Baculatisporites giganticus n. sp., Balmeisporites nipponicus n. sp., Camarozonosporites (Camarozonosporites) similis n. sp., Cicatricosisporites minuticanaliculatus n. sp., C. senonicus n. sp., Cingulatisporites iwatensis n. sp., Foveosporites perfossus n. sp., Gleicheniidites verrucatus n. sp., Laevigatosporites longus n. sp., L. nitidulus n. sp., Leiotriletes giganticus n. sp., Lycopodiacidites circularis n. sp., Lygodiidites tohokuensis n. sp., Punctatisporites granulatus n. sp., Todisporites grandiformis n. sp., Toroisporis (Duplotoroisporis) triangulus n. sp., Trachysporites microverrucatus n. sp., Trilites pulchellus n. sp., T. pustulosus n. sp., Triplanosporites giganteus n. sp., T. rikuchuensis n. sp., T. taneichiensis n. sp., Undulatisporites flexuosus n. sp., Verrucatosporites verruculosus n. sp., Abiespollenites minus n. sp., Alisporites enormis n. sp., Callialasporites ugensis n. sp., Cedripites sanrikuensis n. sp., Classopollis grandissimus n. sp., C. taneichiensis n. sp., Cycadopites mirus n. sp., Ephedripites (Spiralipites) elongatus n. sp., Inaperturopollenites rugatus n. sp., Phyllocladidites globulosus n. sp., Piceapollis grandiformis n. sp., Pityosporites cretaceus n. sp., Podocarpidites senonicus n. sp., Rugubivesiculites japonicus n. sp., R. sphaericus n. sp., Clavatipollenites variabilis n. sp., Cupuliferoidaepollenites lanceolatus n. sp., Foveotricolpites fastidiosus n. sp., F. globosus n. sp., Foveotricolporites gloriosus n. sp., F. grandiformis n. sp., Ilexpollenites minus n. sp., Potamogetonacidites senonicus n. sp., Retitrescolpites pseudoazemae n. sp., Rousea elegantula n. sp., R. reticosa n. sp., R. triangulata n. sp., R. ugensis n. sp., Satishia pomposa n. sp., S. triformis n. sp., S. uniformis n. sp., Symplocacites microreticulatus n. sp., Tricolpites ellipsoideus n. sp., T. oviformis n. sp., T. sphaeroides n. sp., and Tricolpopollenites baculatus n. sp. Furthermore, new combinations are proposed : Appendicisporites aurifer Verbizkaja n. comb., A. cf. bellus Markova n. comb., A. macrorhyzus Maljavkina n. comb., A. cf. pseudomacrorhyzus Markova n. comb., Ephedripites (Spiralipites) longus Song & Zheng n. comb., E. (S.) perlatus Wang & Zhao n. comb., E. (S.) praeclarus Chlonova n. comb., Pityosporites alatipollenites Rouse n. comb., P. microsibiricus Zaklinskaja n. comb., P. cf. piniformis Zaklinskaja n. comb., Ilexpollenites claviger Takahashi n. comb, and Tricolpites rudis Takahashi n. comb. The middle Okonai Member consists mostly of brown to greenish gray sandstone with Crassostrea fossil bank in the lower part and fine sandstone which yields Sphenoceramus sanrikuensis Matsumoto & Sugiyama together with other fossils in the upper part. Formerly the Taneichi Formation was considered as the Neogene, but later revised by Terui et al.(1975) to the middle Upper Cretaceous (Santonian) on the evidence of ammonoids and inoceramid. The Uge Member resembles lithologically the basal Tamagawa Formation of the Kuji Group. Crassostrea fossil bank in the lower horizon of the Okonai Member is closely similar to that of the Tamagawa Formation. Accordingly, the Uge Member and the lower part of the Okonai Member are correlated with the Tamagawa Formation. The upper part of the Okonai Member is like to the Kunitan Formation of the Kuji Group in which Inoceramus (Platyceramus) japonicus Nagao & Matsumoto occurs in yielding Sphenoceramus sanrikuensis Matsumoto & Sugiyama which is an effective member of the Platyceramus japonicus zone and indicates the lowest Campanian in age. The Santonian Uge playnoflora is characterized by the following spores and pollen grains : Aequitriradites verrucosus, Appendicisporites spp., Balmeisporites nipponicus, Camarozonosporites spp., Cicatricosisporites spp., Cyathidites spp., Gleicheniidites senonicus, Jimboisporites senonicus, Lygodiidites spp., Patellasporites spp., Trilites spp., Zlivisporis novomexicanus, Araucariacites australis, Callialasporites ugensis, Classopollis spp., Cupressacites spp., Ephedripites spp., Phyllocladidites spp., Pristinuspollenites microsaccus, Rugubivesiculites spp., Vitreisporites pallidus, Clavatipollenites variabilis, Asteropollis clavatus, Callistopollenites radiatostriatus, Fibulapollis spp., Rousea spp. , Satishia spp., and Tricolpites spp.
URI: http://hdl.handle.net/10069/16606
ISSN: 02871319
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:Volume 30, No. 2

Citable URI : http://hdl.handle.net/10069/16606

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