Late Coniacian- Early Campanian planktonic foraminiferal bioevents and biostratigraphy of the northern Tunisia
Planktonic foraminifera were quantitatively analyzed across theUpper Coniacian - Lower Campaniansuccession at Jebel Ennahli and Ettout sections, northern Tunisia. This succession is characterized by hemipelagic facies domainated by a continuous sedimentary succession, allowing a good biostratigraphi...
| Published in: | Geologia Croatica |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Croatian Geological Survey
2014
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| Subjects: | |
| Online Access: | https://doi.org/10.4154/GC.2014.07 https://doaj.org/article/047084c2fa8844e58c6fa93bd5dc42d9 |
| Summary: | Planktonic foraminifera were quantitatively analyzed across theUpper Coniacian - Lower Campaniansuccession at Jebel Ennahli and Ettout sections, northern Tunisia. This succession is characterized by hemipelagic facies domainated by a continuous sedimentary succession, allowing a good biostratigraphic correlation for this time interval. 55 planktonic foraminiferal species have been identified belonging to 13 genera. The distribution pattern of 17 heterohelicids and 38 trochospiral formsrevealsto the identification of12 major bio-events and establishing three zones based on heterohelicids and five zones based on trochospiral forms. The trochospiral based zones are from base to top: Dicarinella primitiva Interval Zone, Dicarinella concavata Interval Zone, Dicarinella asymetrica Total Range Zone, and Globotruncanita elevata/Globotruncana arca Concurrent Range Zone, Globotruncana ventricosa Interval Zone; while the three heterohelicid based planktonic foraminiferal biozones are: Pseudotextularia nuttalli Interval Zone, Sigalia carpatica Interval Zone, Ventilabrella eggeri/Planoglobulina manuelensis Concurrent Range Zone. The bioevents and planktonic foraminiferal zones were correlated with the previously published works especially in Tunisia and other palaeolatitude provinces. There are no significantplanktonic foraminiferaldatums recordedacross theConiacian/Santonian boundary (CSB) except thelowest occurrence (LO) of Dicarinella asymetrica , which was recorded slightly below the LO of inoceramid Platyceramus cycloides cycloides representing a good proxy for the CSB. The Santonian/Campanian boundary of the studied sections are characterized by a major turnover represented by the highest occurrence of Sigalia , Dicarinella and Whiteinella genera; in addition tothe lowest occurrence of Ventilabrella and Planoglobulina generaand above slightly the LO Globotruncana and Globotruncanita . |
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