Dhanduka Fm
Type Locality and Naming
SUBSURFACE: Well Dhanduka-1 (interval 650 to 1280 m), its thickness is of 630 m. [Original Publication: Mehrotra, R.B., 1977: Cambay Basin, Stratigraphy, tectonic and hydrocarbon occurrences: Lecture delivered to Graduate Trainees at IPE, unpublished report, ONGC.]. The sequence of orthoquartzites, sandstone, lithic wacke and volcanic tuffs occurring between Deccan Traps Fm and Pre-Cambrian granite in well Dhanduka-1 has been designated as the Dhanduka Formation. In subsequent works, the name has been retained. Reference well: Well Anand-D (interval 1535 to 1588.61 m), its thickness is 54.6 m (+)
Synonym: Danduka Fm.
Lithology and Thickness
Coarse-grained sandstone and tuff. In the type section Dhanduka -1, the formation consists of orthoquartzites, coarse-grained sandstone and lithic tuffs/vitric tuffs. In the type section Dhanduka-1, the formation is 630 m thick and in reference section Anand-D the formation attains a thickness of 54.6 m (+)
Relationships and Distribution
Lower contact
In well Anand-D, the formation has unconformable relationship with overlying Deccan Traps Fm. In some wells, the formation has conformable relationship with the overlying Viramgam Fm.
Upper contact
The unconformably overlies the Pre-Cambrian granite basement in the type well.
Regional extent
The formation in the subsurface extends from Dhanduka-1 in western margin to Anand-D in eastern margin and possibly up to Viramgam structure-1 in the north. The formation is considered equivalent to Serau Fm in northern most drilled well Serau East-1 and Dhrangadhra Fm which is exposed in northeastern part of Saurashtra beyond the western margin of Cambay Graben.
GeoJSON
Fossils
The formation is unfossiliferous.
Age
Depositional setting
Additional Information