"C-horizon." YourDictionary, n.d. Web. 16 January 2019. <https://www.yourdictionary.com/c-horizon>.
C-horizon. (n.d.). Retrieved January 16th, 2019, from https://www.yourdictionary.com/c-horizon
In ABC soil, the lowermost zone, consisting mainly of unconsolidated, weathered rock fragments. By comparison with the A and B horizons, the C horizon is relatively unaffected by the processes of soil formation and therefore does not exhibit as much internal layering.