Quite a good number of ultramafic-mafic intrusives have been found in Karbi Hills of Shillong Plateau, NE India. Some of these bear good metal contents, but there is no data on geochronology. In this context, my appeal to the learned international workers having facility of geochronological data generation may kindly contact me at my mail i.d. [email protected], so that the long pending geodynamic evolution model of the craton can be scientifically projected.