The Susquehanna-Shale Hills Critical Zone Observatory (SSHO CZO) lies within the Valley and Ridge Physiographic Province of the central Appalachian Mountains in Huntingdon County, Pennsylvania. It is a first order basin characterized by relatively steep slopes (25-35%) and narrow ridges. Soils contain large pieces of fractured shales and range in depth from 40 cm to 2 m at the valley bottom. Loamy soils are heavily compacted but well draining. Organic layer is 2-5 cm in most places. Lots of additional information can be found at http://www.czo.psu.edu/.