Authors quote the NACSN Code in stating that the "geosol is the fundamental unit of pedostratigraphy, defined as a mappable, stratiform body of material with soil characteristics formed on a previous land surface, with an upper surface that now constitutes both a material and stratigraphic boundary. A formalized geosol is defined at its type locality as a buried soil that contains catenal members." Authors refer to Sangamon, Chapin, and Farmdale as formal geosols but informally name the Indian Point geosol complex which consists of several minor soils occurring in the Robein Silt between the Sangamon and Farmdale Geosols. The complex is described as a sequence of AO-Bg couplets ranging from 3 to 15 cm thick. At most location in the Athens quarry, the sequence is about 1 m thick and overlies about 1 m of massive Meadow Loess Member of the Roxana Silt.

Source: GNU records (USGS DDS-6; Reston GNULEX).