Late Jurassic Radiolarians from the Domodedovo District (Moscow Region)

A representative radiolarian assemblage, first discovered in the Jurassic sequence exposed in the Domodedovo Quarry in the Moscow Region, is studied. The ammonite Amoeboceras sp. was discovered alongside the radiolarians, indicating a Late Oxfordian age for the host beds. The assemblage comprises nine species of seven genera, with a total of eleven genera identified. Warm-water taxa are widely represented in the studied radiolarian assemblage. The dominance of thermophilic forms suggests the penetration of warm currents into the Moscow Basin of the Russian Platform, as well as the possible development of diverse paleoecological niches in the Central Russian Sea during the Late Jurassic. Data on the geographic distribution limits of some taxa identified here for the first time (Pantanellium, Acastea, Acaeniotyle, Acaeniotylopsis, and Teichertus) have been refined and expanded.