The Oligocene Barail sedimentary sequence (Tikak Parbat Formation) of Tiru valley, Nagaland constitutes a part of the Belt of Schuppen. These sequences have been studied for the first time employing lithofacies analysis technique. A total of eleven lithofacies namely, coal facies (C), coaly shale facies (CSh), grey shale facies (Sh), shale-sand laminites facies (Ls), ripple laminated shale-sand facies (Rs), tabular cross stratified sandstones facies (Sp), trough cross stratified sandstones facies (St), compound cross stratified sandstone facies (Sc), ripple cross-stratified sandstone facies (Sr), paleosol facies (P) and mudstone facies (Mst) grouped into two lithofacies associations i.e. coal laminites facies association (CLFA) and cross stratified facies association (XSFA) have been identified using four vertical profile sections (VPS) measured and recorded along cut faces of open cast mine in parts of Tiru valley coal field, Nagaland. Presence of coal, silt-mud, very fine to medium sand, heterolithic stratifications (flaser, wavy lenticular and tidal beddings), compound, tabular and trough cross stratifications having low to tangential foresets with abundant mud drapes, bimodal bipolar cross stratification, and substantial reactivation surfaces indicate deposition in a tidal flat environment.
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