11. They belong to the Alfisol soil order . 12. Many subgroups intergrade to other soil orders . 13. The remaining soil orders have suborder categories that reflect unique characteristics of the given order. 14. Outside of ice ages, oxisols have generally been the dominant soil order in the paleopedological record. 15. The character of the soil orders reflects the arid, strongly-weathered nature of the Australian continent. 16. Four soil orders are found in the upstream river basin viz . ultisols, alfisols, inceptisols and entisols. 17. At the top, most general, level of the Australian Soil Classification, there are fourteen soil orders . 18. Because of their productivity and abundance, the Alfisols represent one of the more important soil orders for food and fiber production. 19. The term originally referred to the region's rich, black topsoil, much of it in the soil order Vertisols. 20. Spodosols are also found in warm, moist environments such as Florida and in fact are the most prominent soil order of the state.
