Relationship between stratigraphical variation in the morphology of Gabonella elongata and geochemical composition of the host sediments |
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| Authors: | H Ivert |
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| Institution: | Department of Historical Geology and Palaeontology, University of Uppsala, Box 558, S-75122 Uppsala, Sweden |
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| Abstract: | One hundred and sixty-two microspheric and 110 megalospheric specimens of the Late Cretaceous benthic foraminifer Gabonella elongata de Klasz and Meijer were picked from 13 borehole samples and analyzed for stratigraphical variation in four variables. Principal component and canonical variate analyses indicate a larger inter-level variation in the relative size of the final chamber in the microspheric generation than in the megalospheric. The morphometrical measurements were weighed against the concentration of 13 chemical elements determined at each level. The analyses indicate that G. elongata developed large tests in arenaceous sediments, whereas carbonaceous, argillaceous sediments seem to have resulted in small tests. Especially the microspheric generation tends to show greater reduction in growth in the ultimate chamber in carbonaceous, argillaceous sediments than in more arenaceous. This indicates that the genetically controlled growth pattern of the last chamber may be influenced by environmental factors such as agitation and clearness of the water. |
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| Keywords: | Morphometry Geochemical-morphometrical relationships Benthic foraminifers |
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