Mikir Trap Fm
Period:
Cretaceous
Age Interval:
Late Aptian
Province:
North East Basins of India
Type Locality and Naming
[Original Publication: Basu, D.N. and Ganapati S. 1962: Report on the work done in Garampani-Dimapur Area, Mikir Hills, Assam, Unpublished ONGC Report.]
[Figure 1: Formation stratotypes of North East Basins (modified after Pandey and Dave, 1998)]
Lithology and Thickness
Volcanic. In the reference section it consists of porphyritic basalt with microcrystalline ground mass. It varies from 10-105 m.
Lithology Pattern:
Lava
Relationships and Distribution
Lower contact
Unconformable contact with the metamorphic basement complex or Bamangaon Fm.
Upper contact
Unconformable contact with the Tura Fm.
Regional extent
It is exposed along the southern and eastern fringes of the Mikir Hills and in well Barpathar #1 in Dhansiri Valley.
GeoJSON
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Fossils
No report of fossils.
Age
Aptian. (118 Ma). Synchronous with Sylhet Trap Fm and Rajmahal Traps Fm. Set here to be same as the Rajmahal Trap Fm span
Age Span:
Beginning stage:
Aptian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
121.40
Ending stage:
Aptian
Fraction up in the ending stage:
0.7
Ending date (Ma):
115.66
Depositional setting
Volcanic
Depositional pattern:
Additional Information
Compiler:
D.S.N Raju