The Eden Hills Area (also known as The Hills of the Bluegrass) of Kentucky lies adjacent to the Inner Bluegrass Area in a crescent shape within which a large area of several counties occur. Carroll, Owen, Grant, Gallatin, Pendleton, and Robertson Counties occur almost entirely within this physiographic region and several other counties have sizable acreages within it. Soils of the area have formed largely on Ordovician aged calcareous siltstones of the Garrard Formation and interbedded calcareous shales, thin limestones, and siltstones of the Eden Formation. Soils developed from these formations occur on strongly sloping to steep landscapes and have a high clay content. with textures. particularly in subsurface horizons. ranging from silty clay loam to clay. With erosion of topsoil which has commonly occurred. these heavy clayey textures often occur at the soil surface. In addition to this feature, many soils in the area are shallow to consolidated or unconsolidated bedrock.
Wells, Kenneth L. and Jones, R. M., "Adjusting Soil pH on Heavy Textured Soils of the Eden Hills" (1987). Agronomy Notes. 69.