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

Matanomadh Fm

Period: 
Paleogene

Age Interval: 
Paleocene


Province: 
W.India Kutch Basin

Type Locality and Naming

OUTCROP. Named after the village Matanomadh. [Original Publication: Biswas, S.K. and Raju, D.S.N. (1971) Note on the rock stratigraphic classification of the Tertiary sediments of Kutch Quart. Jour. Geol. Min. Met. Soc. India. Vol., pp]. A variety of rock types consisting of trap-derived clastic sediments in various degrees of admixture constitute a distinctive type of brightly colored sandy litho-unit named as the Matanomadh Formation by Biswas and Raju (1971).

Synonyms: This unit was named earlier as Sub-Nummulitic (Wynne, 1872); Laterite and lateritic clays (Poddar, 1959); Supra-Trappeans by various authors and Madh Series by Biswas (1965). Biswas and Raju (1971) have used the nomenclature formation in place of series.

[Fig. Geological and structural map of Kutch, also showing the onshore and offshore wells drilled for oil exploration. (Map by Rasoul Sorkhabi in GeoExpro Dec2014, based on various sources including S.K. Biswas, Current Science, 25May2005)]


Lithology and Thickness

Volcano-clastics (reworked Deccan Trap volcanics) and Paleosols. The lithological succession is variable and consists of brightly colored clastic and volcanic material, laterites to clays in the lower part of the formation. The common rock types are red laterite, bauxite, lateritic trap-pebble conglomerate, bentonitic clays, ferruginous clays, tuffaceous sandstone and occasional layers of lignite. The thickness of the formation is extremely variable. The maximum thickness in the type area is 49 m.

[Figure 1: Photoplate of Paleocene sequence, Matanomadh locality (Early Paleocene, image A) (after O. Catuneanu, A. Dave (2017)]

[Figure 2: Geological Map of South Western Kutch (after Biswas and Raju, 1973)]


Lithology Pattern: 
Conglomerate


Relationships and Distribution

Lower contact

Lower boundary sharply defined by red Laterite or conglomerate of volcanic-trap-pebbles above Deccan Traps Fm.

Upper contact

Upper boundary is marked by lignite bands in the type locality, elsewhere the contact is disconformable.

Regional extent


GeoJSON

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Fossils

This formation is generally barren of fossils but locally rich microflora of dicot leaf impressions, occasionally with fossil fruits, pollen-spores and woods are seen.


Age 

Pollen/spores probably indicate Paleocene age.

Age Span: 

    Beginning stage: 
Danian

    Fraction up in beginning stage: 
0.4

    Beginning date (Ma): 
64.29

    Ending stage: 
Selandian

    Fraction up in the ending stage: 
0.5

    Ending date (Ma):  
60.45

Depositional setting

The volcano-clastic sediments were deposited during waning phase of Deccan Traps Fm volcanism. Volcanic debris were reworked and deposited along with clastic in fluvial and lacustrine environment.


Depositional pattern:  


Additional Information


Compiler:  

D.S.N Raju