Citation for published item:lin¡ yD hF nd trvisD sF nd qr¤ okeD hF F nd gehD F nd vurinD tF nd yldeD uF nd ruhoEelexndreD tF nd v¡ enik¡ D vF nd edenthoukD xF @PHIRA 9e highEresolution ronEisotope reord of the uronin stge orrelted to siliilsti sin (ll X implitions for midEgreteous seElevel hngeF9D leogeogrphyD pleolimtologyD pleoeologyFD RHS F ppF RPESVF Further information on publisher's website: httpsXGGdoiForgGIHFIHITGjFpleoFPHIRFHQFHQQ Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Palaeogeography, Palaeoclimatology, Palaeoecology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reected in this document. Changes may have been made to this work since it was submitted for publication. A denitive version was subsequently published in Palaeogeography, Palaeoclimatology, Palaeoecology, 405, 1 July 2014, 10.1016/j.palaeo.2014 Additional information:
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palynological sea-level proxies in hemipelagic sediments: A critical assessment from the Upper ABSTRACT Geochemical and palynological records are presented for an expanded Turonian -Coniacian hemipelagic succession in the central Bohemian Cretaceous Basin. A high-resolution stratigraphic framework is provided by biostratigraphy and organic carbon stable-isotope (δ 13 C org ) chemostratigraphy. A short-term (100 kyr) sea-level curve has been derived from high-resolution transgressive/regressive maxima / shore-proximity data established from basin-wide sediment geometries. The viability of geochemical and palynological parameters as potential sea-level proxies is tested against this independently derived sea-level record. Elemental chemostratigraphy is demonstrated to offer a reliable means of identifying medium-to long-term (0.4 -2.4 Myr) sealevel trends. Manganese maxima are associated with periods of high sea level, and troughs with intervals of low sea level. Falling Mn contents accompany regression and rising values transgression. Major transgressive events associated with medium-term sea-level change are marked by sharp increases in Ti/Al ratios, but short-term (100 kyr) sea-level cycles are not consistently identified. Long-term δ 13 C org variation and dinoflagellate cyst species richness are positively correlated and show similarities to the sea-level curve. Baseline trends have a cycle duration close to the 2.4 Myr long-eccentricity cycle. Dinocyst species richness closely follows short-term changes in sea level, with marked increases in dinocyst diversity coincident with most short-term flooding events. Periods of rapid sea-level rise caused an influx of a more diverse "outer shelf" assemblage into the study area, together with the addition of shallower water species, some of which may have been transported into the central basin by hypopycnal flows. Changes in the proportion and abundance of peridinioid dinoflagellate cysts (principally Palaeohystrichophora infusorioides) were controlled principally by changing nutrient levels. Proximity proxies derived from geochemical and palynological data are not always consistent with the independent sea-level model. This exemplifies the need to understand all factors influencing elemental geochemical and palynological proxies before making simplistic sea level interpretations.
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