A Light Microscopy and Scanning Electron Microscopy study of coccoliths from two bore holes along the City Tunnel Line in Malmö, Sweden

University essay from Lunds universitet/Geologiska institutionen

Abstract: Samples from the Danian were prepared for study of coccoliths, on one hand with Light Microscopy, on the other hand with Scanning Electron Microscopy to test the different advantages and disadvantages of these methods. Light Microscopy studies can be used for quantitative investigations and Scanning Electron Microscopy studies for quantitative and qualitative investigations of coccoliths. Scanning Electron Microscopy is preferred in several respects. Smaller details can be studied as the resolution is considerably higher and the specimen can be tilted, rotated and studied from different angles. The sample preparations for both methods are quick, easy and fairly cheap. It takes about the same time to investigate coccoliths with either technique. Light Microscopy studies are less costly than Scanning Electron Microscopy studies. The material for this study is from two bore holes; one hammer drilled hole and one cored hole. Both bore holes are from the same stratigraphical interval and area, located along the City Tunnel Line in Malmö. This study indicates that hammer drilling can be used in coccolith biostratigraphy, though the hammer drilling method has a higher contamination risk compared to core drilling.

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