E. S. Razumkova, E. V. Zamaraev

Paleoecological conditions of the Middle Triassic (Anisian) in the Kara Sea based on palynology and sporomorph ecogroup analysis (SEG)

Abstract. The paper covers palynological analysis of the Middle Triassic samples from the SSD 31 well section drilled in the Kara Sea. Biostratigraphic analysis of spores and pollen newly identified the assemblage with Aratrisporites spp. — Perotrilites minor in the sedimentary basin and dated the host deposits as Anisian. The assemblage is compared to the Anisian pollen assemblages from different regions (East Urals, West Siberia, Barents Sea region). The established spore and pollen taxa are grouped according to their botanical affiliation and ecological distribution. Sporomorph ecogroup analysis (SEG) led to interpret paleoecological conditions of the Middle Triassic unit sedimentation. During the sedimentary unit accumulation, the climate was found to be warm and humid, and the environment was similar to a coastal plain.

Keywords: pollen, spores, biostratigraphy, paleoecology, Triassic, Kara Sea