Ichnology of the Palaeogene Richmond Formation of eastern Jamaica - the final chapter?

Auteurs-es

  • Ron K. Pickerill Department of Geology, University of New Brunswick, Fredericton, New Brunswick E3B 5 A3, Canada
  • Stephen K. Donovan Department of Geology, University of the West Indies, Mona, Kingston 7, Jamaica
  • Eamon N. Doyk Department of Geology, University of the West Indies, Mona, Kingston 7, Jamaica
  • Harold L. Dixon Department of Geology, University of the West Indies, Mona, Kingston 7, Jamaica

DOI :

https://doi.org/10.4138/1990

Résumé

Previously unrecorded ichnotaxa from the Palaeogene Richmond Formation of eastern Jamaica, namely Cos-morhaphe cf. gracilis, Helminthoida crassa, Paleodictyon? isp. and Taenidium cameronensis, are described. The ichnotaxa are assigned to a previously defined deep-water Scolicia ichnocoenosis characteristic of turbidilic strata. The general exclusion of graphoglyptids in these strata is believed to reflect a combination of the relatively shallow-water depths in which the turbidilic strata accumulated, the abundant organic matter available for biological consumption, and the existence of fluctuating dysaerobic/anoxic and oxygenated conditions at, or immediately below, the sediment-water interface. RÉSUMÉ Les ichnofossiles auparavant non enregistrés provenant de la Formation paleogène de Richmond de Test de la Jamaique, soil Cosmorhaphe cf. gracilis, Helminthoida crassa, Paleodictyon? isp. et Taenidium cameronensis, sont décrits. Ces ichnofossiles sont assigned à l’assemblage d'eau profonde Scolicia anterieurement défini, caractérislique des strates de turbidites. L'absence générate de graphoglyplides dans ces couches est considérée comme refletant une combinaison de la faible profondeur relative à laquelle les strates de turbidites se sont accumulées, l'abondance de matière organique disponible pour la consommation biologique et l’existence de conditions anoxiques et oxygénées fluctuantes è l'interface eau-sédiment ou immédiatement en-dessous. [Traduit par la rédaction]

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Publié-e

1993-03-01

Comment citer

Pickerill, R. K., Donovan, S. K., Doyk, E. N., & Dixon, H. L. (1993). Ichnology of the Palaeogene Richmond Formation of eastern Jamaica - the final chapter?. Atlantic Geoscience, 29(1). https://doi.org/10.4138/1990

Numéro

Vol. 29 No. 1 (1993)

Rubrique

Articles

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