Horizon (geology)

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A geological horizon is an extensive rock body , often with a thin layer , which is of particular geoscientific or mining interest - for example a seam , a water-bearing or separating sediment - or a rock layer , a shear zone or a paleontological find horizon . A horizon within a rock package that can be easily identified by its appearance, composition, fossil content or other characteristic features is referred to as a guide horizon . Leading horizons are important points of reference in the geological mapping of an area.

In soil science , soil horizons are uniform areas within the soil, which differ from the areas above and below due to their similar characteristics and properties.

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