1. This document summarizes a stratigraphic study of the Ambar Formation conducted near Swabi, Pakistan. 2. The Ambar Formation contains light-gray to brownish-gray dolomite with cherty lenses, interbedded limestone and argillite, and rare stromatolites. It is tentatively assigned a Cambrian age. 3. The study area contained quartzite, sandstone, and a dolerite dyke. Ripple marks in the quartzite provided evidence of an ancient ocean. Strike and dip data indicated the beds were tilted towards the northwest.