Definitions for "Fragipan"
(or Hardpan) -- a hard impervious layer typically made from the downward translocation of clays in soil profiles. Water movement vertically across such a barrier is limited.
a dense and brittle pan, or layer, or soils. Its hardness results mainly from extreme density or compactness rather than from high clay content. The material may be dense enough to restrict root, nutrient, and water penetration.
A naturally occurring subsurface horizon that is low in organic matter, has a high bulk density, is slowly or very slowly permeable to water, is mottled and traversed by vertical or reticulate grey veins. It is hard when dry but exhibits a certain brittleness when moist; a common feature of New Zealand yellow-grey earths.