Palynology of Middle Tertiary lacustrine deposits from the Jos Plateau,Nigeria  [in Japanese]

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Abstract

A carbonaceous clay bed, containing fossil leaves and resting on deeply weathered granite in the Sabon Gida tin mine (Jos Plateau, Central Nigeria) , was palynologically investigated. A total of 147 species of palynomorphs were noted and described, among them are the following new forms: Fagraeapollis reticulatus n. gen. et sp. , Malpighiaceoidites periporifer n. gen. et sp., Inaperturopollenites rugosus n. sp., I. minimus n. sp., Perfotricolpites lanceolatus n. sp., P. nigerianus n.sp., Ranunculacidites contaminatus n. sp., Cupuliferoidaepollenites josensis n. sp., Striatopollis nigericus n. sp., S. variabilis n. sp., Euphorbiacites africanus n. sp., Faguspollenite globosus n. sp., Intrabaculitricolporites rotundiporosus n. sp., I. affinis n. sp., I. rugoporosus n. sp., Bomacacidites africanus n. sp., Striatocolporites ovuliformis n. sp., Foveotricolporites tenuiexinus n. sp., Graminidites minor n. sp., Psilodiporites rotundus n. sp., Triatriopollenites josensis n. sp., Triporopollenites subrotundus n. sp., Triorites scabratus n. sp., Cricotriporites anulatus n. sp., C. nigerianus n. sp. , Subtriporopollenites reticulatus n. sp., Ulmipollenites semiundulosus n. sp., Chenopodipollis dispersus n. sp., Tetradomonoporites typhinus n. sp., Polyadopollenites sculptus n. sp. and P. indecorus n. sp. Furthermore new combinations are proposed for Tricolpopollenites cf. minutus Gonzalez Guzman n. comb., Striatopollis catatumbus Gonzalez Guzman n. comb., Tricolporopollenites protensus Takahashi n. comb., Intrabaculitricolporites consularis Takahashi n. comb, consularis n. comb., I. consularis Takahashi n. comb. globularis Takahashi n. comb., Striatocolporites cf. striatulus Takahashi & Jux n. comb., Rhoipites cf. finitus Gonzalez Guzman n. comb., R. cf. rugatus Kedves n. comb., Tetracolporopollenites laevigatus Salard- Cheboldaeff n. comb, and T. cf. africanus Sah n. comb. Several species had to be indicated by open nomenclature as done with Gemmatosporis sp. a, G. sp. b, Cupuliferoidaepollenites sp. a, C. sp. b, Retitrescolpites sp. a, R. sp. b, Cupuliferoipollenites sp. a, C. sp. b, Tricolporopollenites sp. a, T. sp. b, Intrabaculitricolporites sp. a, I. sp. b, I. sp. c, Striatocolporites sp. a, S. sp. b, S. sp. c, Rhoipites sp. a, R. sp. b, R. sp. c, R. sp. d, R. sp. e, Graminidites sp. a and G. sp. b. The remaining sixty-five identified species underline a Middle Tertiary age of the palynomorph assemblage from the clay bed mentioned above. The stratigraphic age may be even confined to the Late Oligocene until Early Miocene. From the regional geologic features and both the sedimentologic and palynologic data it can be concluded that the Jos Plateau was already drained by meandering sloughs which had dissected the lateritic surface by the end of the Paleogene. Then, a rich vegetation, obviously arranged in associations according to existing relief and humidity of the ground, framed the swampy depressions of the Jos Plateau.

Journal

  • Bulletin of the Faculty of Liberal Arts,Nagasaki University. Natural science

    Bulletin of the Faculty of Liberal Arts,Nagasaki University. Natural science 29(2), p181-367, 1989-01

    〔長崎大学教養部〕

Codes

  • NII Article ID (NAID)
    120000916583
  • NII NACSIS-CAT ID (NCID)
    AN10352293
  • Text Lang
    JPN
  • Article Type
    departmental bulletin paper
  • Journal Type
    大学紀要
  • ISSN
    02871319
  • NDL Article ID
    3216992
  • NDL Source Classification
    ME71(古生物)
  • NDL Source Classification
    ZM2(科学技術--科学技術一般--大学・研究所・学会紀要)
  • NDL Call No.
    Z14-159
  • Data Source
    NDL  IR 
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