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| single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition |
| rich soil containing a relatively equal mixture of sand, silt and a smaller proportion of clay |
| A horizon
In ABC soil, the uppermost, darkest zone that is rich in organic matter. The upper section of the A horizon usually contains humus along with plant and animal matter in varying stages of decay. The middle section usually contains a high concentration of quartz or other minerals that remain following the leaching away of clay, iron, and aluminum. The lower section is typically transitional in nature between the A horizon and the B horizon. Also called zone of leaching. |