There is also a minor carbonate lithofacies composed of arenaceous limestone. The Lumshiwal Formation is dominated by the two sandstone lithofacies. These lithofacies generally are defined on the basis of grain size, clay content, and depositional bedding characteristics.
Carbonaceous debris is common along the bedding planes.
Ironstone nodules several centimeters in diameter are commonly found throughout the lithofacies. A ranges from 80 to 90 percent, based on hand sample observations. Lithofacies A may grade vertically or laterally into the combined lithofacies and, in places, may be interbedded with the combined lithofacies. Broad, low-angle crossbedding is rare. Lithofacies B is composed of individual units as much as 10 m thick that are separated by basal scours that extend laterally across the outcrop for many tens of meters.