Volgian and Santonian—Campanian Radiolarian Events of the Russian Arctic and Pacific Rim

Valentlna S Vishnevskaya,Genrietta E Kozlova

doi:10.4202/app.2011.0040

Abstract

Radiolarians are widely distributed in two siliceous intervals that coincide with the Tithonian—Berriasian and Santonian— Campanian boundaries in the Mesozoic of the Russian Arctic and Pacific Rim. The first level is rich in organic matter and typical of Jurassic—Cretaceous boundary strata from the Russian North European Margin (Barents-Pechora, Volga-Urals, and Siberian hydrocarbon provinces, as well as western Kamchatka). Abundant and diverse representatives of the family Parvicingulidae provide a basis for establishing the new genus Spinicingula (uppermost Middle Volgian—Lower Berriasian); another new genus, Quasicrolanium (Upper Volgian—Upper Berriasian) is also described. A Santonian— Campanian siliceous interval with radiolarians is documented from the margins of northern Asia (eastern Polar Ural, Kara Basin, Kamchatka). The Boreal genus Prunobrachium makes its first appearance at the Santonian—Campanian boundary and reaches an acme in Campanian strata. Radiolarian data can be used for basin biostra...

Highlights

Radiolarians are widely distributed in two siliceous intervals that coincide with the Tithonian–Berriasian and Santonian–Campanian boundaries in the Mesozoic of the Russian Arctic and Pacific Rim
The first level is rich in organic matter and typical of Jurassic–Cretaceous boundary strata from the Russian North European Margin (Barents−Pechora, Volga−Urals, and Siberian hydrocarbon provinces, as well as western Kamchatka)
Abundant and diverse representatives of the family Parvicingulidae provide a basis for establishing the new genus Spinicingula; another new genus Quasicrolanium (Upper Volgian–Upper Berriasian) is described

Summary

Introduction

Radiolarians are widely distributed in two siliceous intervals that coincide with the Tithonian–Berriasian and Santonian–Campanian boundaries in the Mesozoic of the Russian Arctic and Pacific Rim. The first level is rich in organic matter and typical of Jurassic–Cretaceous boundary strata from the Russian North European Margin (Barents−Pechora, Volga−Urals, and Siberian hydrocarbon provinces, as well as western Kamchatka). Abundant and diverse representatives of the family Parvicingulidae provide a basis for establishing the new genus Spinicingula (uppermost Middle Volgian–Lower Berriasian); another new genus Quasicrolanium (Upper Volgian–Upper Berriasian) is described.

Results

Conclusion