Figure 13. Magnetostratigraphic correlation of the composite Upper Hauterivian-Lower Barremian rock sequence from the Uliyanovsk-Samara right-hand Volga Region with the rock sequences of the Saratov East-Volga region: (1) ammonite finds: Speetoniceras cf. coronatiforme (M. Pavlowa) (depth 126 m) and Aconeceras sp. juv. (depth 93 m); (2) microfauna (foraminifer) samples: Haplophragmoides nonioninoides (Reuss), Cribrostomoides infracretaceous (Mjatl.), C. sinuosus (Bulyn.), C. romanovae (Bulyn.), C. concavoides (Bulyn.), Evolutinella nascens (Kusina), Trochammina neocomiana (Mjatl.), Glomospirella gordialis (Park. et Jones) (depth of 112 m); Haplophragmoides nonioninoides (Reuss), H. barremicus (Mjatl.), H. latidorsatus (Bornemann), H. ustjurticus Mamaeva, H. sp., Evolutinella portentosa (Mjatl. et Koss.), Hyperammina sp., Reophax consonus (Bulyn.), Trochammina neocomiana (Mjatl.), Ammobaculites quadrilocularis (Mjatl.), Glomospira gordialis (Park. et Jones), Lenticulina lideri (Roman.), L. macra (Gorb.), L. munsteri (Roem.), Globulina lacrima (Reuss), Conobrinopsis barremicus (Mjatl.), Gavelinella barremiana (Bettenstaedt) (depths of 107, 83, and 66 m). The microfauna was determined by K. I. Kuznetsova (Geol. Inst., Russian Acad. Sci.). (See legend)