11. Within the basal shell layer traces of an eroded soil horizon ( paleosoil ) were found. 12. Soil horizons form over thousands of years by the leaching of iron and clay from above.13. Anthrosols can be found worldwide, though they tend to have different soil horizons in different regions. 14. Block A consists of 9 soil horizons . 15. Near the bottom of the core, Saunders found a reddish, clay-enriched level scientists call a soil horizon . 16. In addition to concentrations of artifacts, an ashy soil horizon was excavated north of the conical mound. 17. Only two soil horizons were recorded. 18. "Acrophialophora fusispora " exhibits a distinct preference for deeper ( 30 45 cm ) soil horizon in India. 19. Generally, plinthite forms in a soil horizon that is saturated with water for some time during the year. 20. Most fossil soils before the development of terrestrial vegetation in the Silurian are entisols, showing no distinct soil horizons .
