Original paper

Palynology, sequence stratigraphy, and palaeoenvironments of Middle to Upper Jurassic strata, Bayu-Undan Field, Timor Sea region

[Part One]

Mantle, Daniel Jack

Abstract

Detailed palynological analysis of 230 core and sidewall core samples from the uppermost Plover, Elang, and lower Frigate formations, Bayu, Undan Field, Timor Sea, reveals the presence of diverse and moderately well preserved palynomorph assemblages (predominantly dinoflagellate cysts, together with acritarchs, spores, and pollen grains) that facilitate biostratigraphic, sequence stratigraphic, and palaeoenvironmental interpretations. This report comprises two parts:

Part One: spore, pollen, and dinoflagellate (Microdinium through Voodooia) taxonomy.
Part Two: dinoflagellate (Rigaudella through Woodinia), acritarch, and prasinophyte phycomata taxonomy; beiostratigraphy; sequence stratigraphy; and palaeoenvironmental synthesis.

The palynomorphs detailed systematically in this first part comprise 96 spore and pollen species and 32 dinoflagellate species. Of these, the following four dinoflagellate cyst species are newly instituted: Broomea fusticula, Meiourogonyaulax baculata, Paragonyaulacysta? feneseptata, and P. helbyi. A further four species are not formally named due to a lack of adequately preserved specimens. One genus, Boomea COOKSON & EISENACK (1958), is formally emended. The palynostratigraphic sequence has previously been assessed as latest Bathonian to early Oxofrdian in age, based mainly on correlations with European dinoflagellate assemblages dated by ammonite faunas.

Keywords

Sporespollen grainsdinoflagellate cystssystematic palynologyTimor SeaElang FormationJurassic SporenPollenkörnerDinoflagellaten-Zystensystematische Palynology Timor SeeElang FormationJura