Fig. 6. The Tesuque Formation of the Santa Fe Group is an important component of the regional aquifer beneath the Pajarito Plateau. The Tesuque Formation is typically made up of fluvial and lacustrine deposits of pink to buff siltstone and silty sand. Lenses of pebble conglomerate and clay are also present. Top photograph shows typical bedding characteristics of stratified Tesuque deposits. Middle photograph is close up view of silts and silty sands that are the predominant rock types. The bottom photograph shows channels of pebble conglomerate interbedded with silty sands. Photographs taken in lower Los Alamos Canyon.