Abstracts
Abstract
Previously unrecorded ichnotaxa from the Palaeogene Richmond Formation of eastern Jamaica, namely Cos-morhaphe cf. gracilis, Helminthoida crassa, Paleodictyonl 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.
RESUME
Les ichnofossiles auparavant non enregistrls provenant de la Formation paleogene de Richmond de Test de la JamaTque, soil Cosmorhaphe cf. gracilis, Helminthoida crassa, Paleodictyonl isp. et Taenidium cameronensis, sont decrits. Ces ichnofossiles sont assigned a 1'assemblage d'eau profonde Scolicia anterieurement defini, caracterislique des strates de turbidites. L'absence generate de graphoglyplides dans ces couches est considdree comme refletant une combinaison de la faible profondeur relative a laquelle les strates de turbidites se sont accumul£es, l'abondance de matiere organique disponible pour la consommation biologique et 1'existence de conditions anoxiques et oxyg£n6es fluctuantes a l'interface eau-sediment ou imm£diatement en-dessous.
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