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Deona Formation
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Deona Fm base reconstruction

Deona Fm

Period: 
Ordovician

Age Interval: 
Lower Ordovician


Province: 
N.India Lesser Himalaya

Type Locality and Naming

Himachal Pradesh, named after the village Deona (Singh et al., 2019). [Original Publication: Singh, Birendra P., Bhargava, O.N., Mikuláš, R., Prasad. S. K., Morrison, S., Chaubey, R.S. and Kishore, N. (2019). Discovery of traces of Cruziana semiplicata and C. rugosa groups (Cambro-Ordovician) from the Lesser Himalaya, India and their stratigraphic, tectonic and palaeobiogeographic implications. Jour. Palaeont. Soc. India. 64(2), 283-303; [Srikantia, S.V. and Bhargava, O.N., 2021. Geology of the Himachal Pradesh. 1-445.]

[Figure: Location map (provided by O.N. Bhargava & Birendra Singh)]


Lithology and Thickness

Sandstone. Comprises of Arkosic sandstone, quartzite, shale imparting and algal sandy limestone and sandstone; ~200 m.

[Figure: Vertical section of lithology vs fossil data (provided by O.N. Bhargava & Birendra Singh)]

[Figure: Field photo (provided by O.N Bhargava & Birendra Singh)]

[Figure: Sedimentary structures 1 (provided by O.N Bhargava & Birendra Singh)]

[Figure: Sedimentary structures 2 (provided by O.N Bhargava & Birendra Singh)]


Lithology Pattern: 
Sandstone


Relationships and Distribution

Lower contact

Angular discordance with Shale Member and Tal Gr.

Upper contact

Unconformable with Bijni Fm

Regional extent

NigaliDhar syncline in Himachal Pradesh


GeoJSON

{"type":"Feature","geometry":{"type":"MultiPolygon","coordinates":[[[[76.86,32.93],[76.28,33.02],[76.81,31.7],[77.38,30.95],[79.23,29.66],[80.13,29.32],[80.37,29.97],[79.78,30.1],[78.44,31.25],[77.6,31.59],[77.56,32],[76.86,32.93]]]]}}

Fossils

Trace fossils: Arthrophycus cf. A. brongniartti, Asterosoma ludwigae, Bergaueria perata, Cruziana semiplicata, Cruziana furcifera, Curvolithus simplex, Diplichnites gouldi, Monomorphichnus lineatus, Phycodes circinatum, Phycodes palmatum, Phycodes rarus, Palaeophycus striatus, Planolites isp., Rusophycus leifeirikssoni, Rusophycus petraeus, Rusophycus latus, Rusophycus isp.-A , Rusophycus isp.-B, Rusophycus isp.-C, ?Rhabdoglyphus isp, and Treptichnus pedum (Singh et al., 2019). Body fossils have not been yet recorded.


Age 

Lower Ordovician

Age Span: 

    Beginning stage: 
Tremadocian

    Fraction up in beginning stage: 
0.5

    Beginning date (Ma): 
481.96

    Ending stage: 
Floian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
471.26

Depositional setting

The lower part of the Deona Fm is deposited in a mixed-flat (tidal flat complex) to sand sheet complex front and margin (subtidal sand sheet complex) and upper part is deposited in a shallow sea.


Depositional pattern:  


Additional Information

See Srikantia and Bhargava, 2021


Compiler:  

O.N. Bhargava & Birendra Singh.