The Kidderminster Formation is distinguished by the abundance of pebbles. To move pebbles (many several centimetres in size) would require fast flowing water. The pebbles along with the cross-bedded sandstones that make up the formation indicates an environment of fast flowing braided rivers, probably triggered by heavy rainstorms, producing flash floods. The Kidderminster Formation (also known as the Kidderminster Conglomerate) forms is unconformable (erosion surface) on the underlying Permian (Bridgnorth)  sandstones.