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A palynological investigation of the chalk-rich diamicts of north Norfolk

By James B. Riding

Abstract

Except for sample 4, the samples examined are either rich in Kimmeridgian or Late Cretaceous dinoflagellate cysts. This conclusion would support two distinct ice flow directions for this chalk-rich till facies in this area. Samples 1, 2, 3, 6 and 8 are rich in Kimmeridgian dinoflagellate cysts. They also have similar palynomorph signatures in that the Kimmeridgian dinoflagellate cyst floras are generally associated with low levels of Carboniferous and Lower Cretaceous spores and, unsurprisingly, significant levels of Jurassic miospores. Sample 8 yielded the most diverse Kimmeridgian dinoflagellate cysts that are indicative of the input of Lower Kimmeridge Clay Formation. The other Kimeridgian rich samples (1, 2, 3 and 6) are similar in species makeup, so these are also assumed to have been derived from the Lower Kimmeridge Clay. Samples 5 and 7 are dominated by Late Cretaceous dinoflagellate cysts indicative of substantial input from the Chalk Group. The association in sample 5 is indicative of the Campanian to early Maastrichtian, indicating input from the Upper Chalk. The flora from sample 7 is similar to that of sample 5 and is also assumed to have been derived from the local Upper Chalk. Sample 4 is unlike the remainder of the samples and is dominated by Quaternary pollen and non-age diagnostic forms, with lesser proportions of early Toarcian, Late Cretaceous and Palaeogene dinoflagellate cysts

Topics: Earth Sciences
Publisher: British Geological Survey
Year: 2005
OAI identifier: oai:nora.nerc.ac.uk:11108

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