This specimen is a well compacted sandstone. Sand sized particles constitute nearly 100 percent of slide area. The detrital grains are composed of about 75 percent quartz; approximately 90 percent mono-crystaline, with polycrystalline and aphanitic varieties of lithic origin composing the remaining 10 percent. The remaining 25 percent of slide area was originally occupied by feldspars and ferromagnesian minerals or lithic varieties composed of these minerals. These have now almost completely weathered to a variety of clay and mica species. Kaolinite, smectite, and sericite group minerals as well as oxyhydroxides are all present in these alteration areas. About 10 percent of the slide area is angular void space that gives the impression of missing grains. These areas likely also contained alteration products lost in slide preparation and are counted toward their 25 percent estimate. In regards to the quartz component, maximum grain size is 1.1 mm and minimum is .1 mm. This minimum is in reference to original detrital grain size, not the smallest crystal in polycrystalline grains, which ranges down to cryptocrystalline. Modal grain size is approximately .35 to .65 mm. The overall texture is well sorted. Grain boundaries show insipient suturing that has obscured original grain shape. The parent material for this sandstone was a geologically mature sand. The high degree of weathering of the non-quartz component makes qualitative classification difficult but based on this thin section the sandstone appears to be an arkose. There is no macrostructure, such as bedding, visible in this thin section.