Borehole Sandy-siltstone Fm
Period:
Cretaceous
Age Interval:
Hauterivian, U2
Province:
Ustyurt-Sultanuzdag
Type Locality and Naming
By the predominance of sandstones and siltstone (aleurolites). Pitnyak uplift. I.M.Abdurazimov in 1996.
Synonym:
Lithology and Thickness
Sandstones, siltstone (aleurolites), dark gray clays with layers of polymictic conglomerates. Thickness 50-200 m.
Lithology Pattern:
Fine-grained sandstone
Relationships and Distribution
Lower contact
Lies conformably on the Borehole Conglomerate-sandstone Fm
Upper contact
It is overlain with erosion by the Sultanbobin Fm. Schematic stratigraphic column indicates Chimbay Fm
Regional extent
Pitnyak uplift, Northwest Kyzylkumy, Khorezm depression. Boreholes.
GeoJSON
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Fossils
Contains a complex of spores and pollen.
Age
Conditionally belongs to the Aptian stage lower+middle(?) Used in the legend of the Pre-Aral subseries to geological maps of the m-ba 1: 200000,1998. Put as base Hauterivian as TEMP for Schematic Stratigraphic column graphics -- BUT "lower+middle Aptian" => coeval with Cimbay-Khodzeilin Fm !
Age Span:
Beginning stage:
Hauterivian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
132.60
Ending stage:
Hauterivian
Fraction up in the ending stage:
0.7
Ending date (Ma):
128.33
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)”