Title

M. A. Alekseev

Foraminifera and paleogeography of the Jurassic deposits in the Lena-Anabar trough (Middle Siberia)

The article includes results of the study on Middle Jurassic Foraminifera remaines from the deposits of Lena-Anabar depretion and lateral changes of their orictocenoses. The reconstraction of the bottom relief of the Lena-Anabar basin in the Middle Jurassic time has been made. It confirms new data concerning the distribution of the Middle Jurassic formations in the Lena River Delta and middle course of the Anabar River.
Key words: orictocenoses, biofacies, Jurassic period, foraminiferes, stratigraphy, formation, boreal zone, Siberia, Lena River, Anabar River.