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Young Formation
Click to display on map of the Ancient World at:
Young Fm base reconstruction

Young Fm

Period: 
Ordovician, Silurian

Age Interval: 
Late Ordovician-Early Silurian (?458-?433 Ma)


Province: 
NW Himalaya Kumaun-Garhwal Tethyan Himalaya

Type Locality and Naming

Named after Young village in Painkhanda region, Chamoli District, Malla Johar region, Kumaun Tethyan Himalaya. [Original Publication: Shah, S.K., Sinha, A.K., 1974. Stratigraphy and tectonics of the Tethyan zone in a part of western Kumaon Himalaya. Himalayan Geology 14, 1-27.]

Synonyms: Yong Formation; Shiala-Yong Formation (O.N. Bhargava, 2008)

[Figure 1: Location of the Kumaun-Garhwal region (from Celerier et al., GSA Bull 2009)]

[Figure 2: Geologic map of the Kumaun-Garhwal region (from Celerier et al., GSA Bull 2009)]


Lithology and Thickness

Reef limestone. Comprised of grayish brown, green biohermal and biostromal limestone, mud and marl also present. 45-80 m thick


Lithology Pattern: 
Reef limestone


Relationships and Distribution

Lower contact

Conformably overlies the Shiala Fm.

Upper contact

Successively overlain by the Variegated Fm.

Regional extent

Kumaun to Garhwal regions


GeoJSON

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Fossils

Stromatoporids; corals, branched algae; crinoids; and bryozons. Bryozoans: Colostylis (?) dscvidiana; Streptolasma sp; Scolecodont: Aniscocerasites, Arabellites, Arites, Diopatraites, Kettnerites, Oenosites, Acritarch: Baltisphaeridium


Age 

Late Ordovician-Early Silurian (but underlying very-thick Shiala Fm also assigned as same "Late Ordovician-Early Silurian", therefore put here as only Silurian for graphic purposes.)

Age Span: 

    Beginning stage: 
Aeronian

    Fraction up in beginning stage: 
0.0

    Beginning date (Ma): 
440.49

    Ending stage: 
Aeronian

    Fraction up in the ending stage: 
1.0

    Ending date (Ma):  
438.59

Depositional setting

Not available


Depositional pattern:  


Additional Information


Compiler:  

Birendra Singh & O.N. Bhargava.