The soil stratification It is the way in which the sediments in the soil accumulate on top of each other, in layers. Soil formation is a process that lasts millions of years, and in that time hundreds of thousands of layers of different materials have accumulated.
Rock or layered soils are made up of visible layers of sediment, which can be a few millimeters to several hundred meters thick. They are made up of a wide variety of shapes and materials.
The strata can be made up of layers of earth, other living beings, gases, water, mineral salts, lava, stone or volcanic fragments deposited one on top of the other..
Soil stratification can be seen with the naked eye in some places, such as ancient river beds. That stratification is so old that it has been transformed into rock.
Sedimentary rock formed with layers of sediment over time. These layers of sediment create the pattern of visible bands or strata. These strata show the geological history of the environment in which the rock was formed..
For example, if there is a layer of clay followed by a layer of limestone, it is known that the environment was once a muddy environment before turning into a lake or something similar..
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The layers or strata are visible due to the result of changes in the texture or composition of the material during its deposit.
This exposure of the strata may also be due to the pauses produced in the deposition of the different materials, or to changes in their composition or temperature before the newer strata covered them..
Another cause of the particular shape that the profiles take, especially in river channels, is the composition in particles, some finer and others thicker. The different colors originate from the different mineral compositions.
Water and wind also intervene, carrying out a work of homogenizing the particles that they drag, classifying them according to their size, weight and shape. This gives shape to the stratification.
The strata are called "horizons" and the set of layers is called "profile".
Each profile is made up of at least four horizons, listed below from top to bottom:
Exposed to erosion and washing away from rain, it is composed of porous organic matter, living organisms and minerals.
It is also made up of remains of leaves and branches, humus and fungi. In addition, it has some inorganic elements and its color is brownish..
At a deeper level it contains clays, iron oxides and moist organic matter..
It has clays and has reddish tones due to its ferric compounds. It also contains traces of altered rock and organic material from the first profile..
It is made up of rocky material fragmented in different proportions, subjected to processes of weathering or decomposition of the rock into smaller parts, physically or chemically.
It is a rocky material on which the soil is supported. It is composed of inorganic elements of volcanic and sedimentary origins and grains of petrological origin..
It remains practically unaltered, or without significant alterations, over time.
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