Borehole Terrigenous-Carbonate Formation

Borehole Terrigenous-Carbonate Fm

Period:

Cretaceous

Age Interval:

Campanian - Maastrichtian, U6

Province:
Ustyurt-Sultanuzdag

Type Locality and Naming

Predominantly terrigenous and carbonate rocks. Pitnyak uplift. I.M. Abdurazimova in 1996.

Synonym: Terrigenous-Carbonate Topitsa, Терригенно-карбонатная т.

Lithology and Thickness

Divided into two sub-suites.

Upper - marls, clays, sandstones, sands, limestones. Thickness 3-75m.

Lower - clays, marls, sandstones with interlayers of limestones, with phosphorite pebbles at the base. Thickness 30-86m.

Lithology Pattern:

Shallow-marine marl

Relationships and Distribution

Lower contact

Upper – Unconformably overlies the lower sub-suite

Lower – Unconformably overlies the Laulau Fm.

Upper contact

Upper – Unconformably overlain by the Paleogene.

Regional extent

Used in the legend of the Priaralskaya (Pre-Aral) subseries for geological maps of the 1:200000 scale, 1998.

GeoJSON

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Fossils

Upper – Contains belemnites - Belemnelia arkhangelskii Naid., marine bivalves - Liostrea lehmannii Rom.; sea urchins - Hemipneustes striatoradiatus (Leske); foraminifera - Gavelinella complanata (Reuss), G. ex gr danica (Brotz.), Cibicidoides bembix (Marss.), Globotruncana rugosa Cushm., Bolivina incrassata incrassata (Reuss), B. deccurens (Ehrenb.), Reusella minuta (Reuss).

Lower – Contains ammonites - Hoploscaphites aquisgranensis Schlüt., marine bivalves - Lopha (A.) falcata Mort., gastropods - Xenophera canaliculata Orb.; foraminifera - Gavelinella clementiana clementiana (Orb.), Brotzenella monterelensis (Marie), Cibicidoides voltzianus (Orb.)

Age

Upper – Belongs to the Maastrichtian. Lower – Belongs to the Campanian.

Age Span:

Beginning stage:

Campanian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

83.65

Ending stage:

Maastrichtian

Fraction up in the ending stage:

1.0

Ending date (Ma):

66.04

Depositional setting

Depositional pattern:

Additional Information

Compiler:

I.M. Abdurazimova – In: GeoGPT translation of: “Abduazimova, Z.M. (Ed.), 2001. Stratigraphic Dictionary of Uzbekistan. IMR (Institute of Mineral Resources), Tashkent, 580 pp. (In Russian)”