Pariwar Fm

OUTCROP and SUBSURFACE. Scarp section East of Habur village. [Original Publication: Swaminath, J., Krishnamurthy, J.G., Verma, K.K., and Chandak, G.J., 1959, General geology of Jaisalmer area, Rajasthan, ECAFE Symposium, Mineral Research and Development Series 10: 154-155]. Reference well: Outcrops near Kuchri and Kali Dungri areas. Well Bhuana-1, interval 400-603m.

Synonyms: Oldham (1886) first described the formation as “Parihar beds”, which included the entire arenaceous sequence from Lower Cretaceous to Paleocene. Later on Swaminathan et al (1959) dropped the word “beds” and designated the sequence as Pariwar Formation. Dasgupta (1975) suggested informally two subdivisions in this formation Lower and Upper. The name was adopted by Narayan et al (1961) who equated it with Umia beds of Kutch. Willm (1964) spelled it as “Pariwar Formation”.

Siltstone. The lower part is represented by yellow to brown interbedded sandy siltstone and calcareous sandstone. The middle part consists of yellow sandy clay with embedded large fossil tree trunks. The upper part comprises of pebbly sandstone and siltstone with fossil wood at its base. Dasgupta (1975) has measured about 350 m thickness of the formation on surface. In subsurface maximum thickness of the order of 850 m is recorded in the well Lang-2.

[Figure 1: Location map of West Rajasthan Basins (after Pandey and Dave, 1998)]

[Figure 2: Stratotype of Pariwar Formation, Mesozoic Lithostratigraphy of the Jaisalmer Basin, Rajasthan, Journal of the Paleontological Society of India, Vol. 51(2) (after Singh N.P, 2006)]

[Figure 3: Generalized and Subsurface Stratigraphy of Jaisalmer Basin (from dghindia.gov.in)]

Epistomina cf. E. tenuicosta, Ammobaulites cf. minimus, Lenticulina cf. petecensis have been reported by Sigal and Singh (1980).

Continental with intermittent, shallow inner neritic