The lithology of a rock unit is a description of its physical characteristics visible at outcrop. Lithology is the basis of subdividing rock sequences into individual lithostratigraphic units for the purposes of mapping and correlation between areas.
Source: The general geological map of the Ayad river basin has been prepared by using published geological map from Geological Survey of India (GSI) (https://www.gsi.gov.in/webcenter/portal/OCBIS), and it has updated through Landsat-9 OLI-2 satellite imagery (30 m spatial resolution), SRTM DEM data (30 m spatial resolution), and Survey of India (SoI) topographical map at 1:50,000 scale with limited field check.