Abstract
Abstract. A low diversity fauna of unusually large (individuals of two to three times the normal size) agglutinated and calcareous benthic foraminifera is recorded from the Late Campanian – Early Maastrichtian Chalk sequences of two boreholes (Shell 49/19.1 and Shell 49/20.2) in the Southern North Sea Basin. Associated planktonic species are extremely rare. This distinctive assemblage provides a useful local stratigraphical marker.
Highlights
ABSTRAC’T-Electron microprobe analyses and element distribution images of a Rotuliammina test from Funafuti, S.W
Representative analyses are given in Table 1, four from the umbilical surface, five from the spiral surface and two from the peripheral flange, each on opposite sides of the test
The difference in appearance between the rough spiral and smooth umbilical surfaces of the Rotaliammina test described here is accompanied by a difference in chemical composition: the chamber walls of the umbilical side are rich in sulphur and magnesium-bearing organic compounds, whereas the agglutinant-rich spiral surface is largely calcium carbonate
Summary
ABSTRAC’T-Electron microprobe analyses and element distribution images of a Rotuliammina test from Funafuti, S.W. The example serves to illustrate a useful analytical method which has application to the study of the structure and composition of the wall ot‘ agglutinating foraminifera in general. Electron probe microanalytical techniques are useful for compositional studies of the tests of foraminifera since areas for analysis are selected using high resolution electron imaging and the analytical resolution of the method is better than 5 p m. It is possible t o examine in detail t h e different structures of the test andto avoid contaminant particles. Results of analyses of other species have been incorporated into several taxonomic papers prepared by my collaborators and presented elsewhere (e.g. Bronnimann, 1986)
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