The Exposed Upper Jurassic deposits near the village of Gorodischi, Ulyanovsk Oblast

Ulyanovsk Oblast

Ulyanovsk Oblast is a federal subject of Russia . It is located in the Volga Federal District. Its administrative center is the city of Ulyanovsk...

  on the right bank of Kuybyshev Reservoir is one of the protected areas of Ulyanovsk Oblast

Protected areas of Ulyanovsk Oblast

-Natural Monuments:* Wood Pearl* Relic woods* Akshuatian dendopark* Greater springs* The Mountain pine forest* The Source of Sviyaga River* The Forest belt of Genko* Cretaceous steppes from karagana* Upper Jurassic deposits of Gorodishchi* Island «Borok»...

.

The Gorodishchi exposure is within the Ulyanovsk paleontology

Paleontology

Paleontology "old, ancient", ὄν, ὀντ- "being, creature", and λόγος "speech, thought") is the study of prehistoric life. It includes the study of fossils to determine organisms' evolution and interactions with each other and their environments...

 zakaznik

Zakaznik

Zakaznik is a type of protected area in Russia and other former Soviet republics such as Ukraine that meets World Conservation Union's category III, or more frequently category VII criteria....

. It is scientifically valuable as a basal section Upper Jurassic adjournment on Russian Platform. Many fossils have been recovered from it, including vertebrae of ichthyosaur

Ichthyosaur

Ichthyosaurs were giant marine reptiles that resembled fish and dolphins...

s and plesiosaur

Plesiosaur

Plesiosauroidea is an extinct clade of carnivorous plesiosaur marine reptiles. Plesiosauroids, are known from the Jurassic and Cretaceous Periods...

s, and mollusc shells. The Cambrian

Cambrian

The Cambrian is the first geological period of the Paleozoic Era, lasting from Mya ; it is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux. The period was established by Adam Sedgwick, who named it after Cambria, the Latin name for Wales, where Britain's...

 deposits are partially covered by a landslip, and they are below the level of the Kuybyshev Reservoir.

The deposits provide an easy access to Jurassic

Jurassic

The Jurassic is a geologic period and system that extends from about Mya to  Mya, that is, from the end of the Triassic to the beginning of the Cretaceous. The Jurassic constitutes the middle period of the Mesozoic era, also known as the age of reptiles. The start of the period is marked by...

 and Cretaceous

Cretaceous

The Cretaceous , derived from the Latin "creta" , usually abbreviated K for its German translation Kreide , is a geologic period and system from circa to million years ago. In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the...

fossils. The layers consistently leaning against each other contain valuable information about evolution between the two geological periods: Jurassic and Cretaceous.