The size of the grains in a sedimentary rock is primarily indicated by its texture, which can be described as coarse, medium, or fine. The presence of visible grains, their shape, and the degree of sorting (uniformity of grain size) are key features that help determine grain size. Additionally, the rock's composition and the method of deposition can provide insights into the grain size, as different environments produce distinct sediment characteristics.
texture
Sedimentary rocks are often deposited in layers as strata. The feature that tells how a sedimentary rock is layered is called the bedding.
Grain size is more important for determining the classification of clastic sedimentary rocks, such as sandstone or shale. Composition is more important for determining the classification of chemical sedimentary rocks, such as limestone or rock salt. Layering is more important for identifying the structure of sedimentary rocks, such as bedding in sandstone or shale.
it tells us about the transportation of sediments before deposition. i.e if a sediment has travelled a longer distance, it'll be rounder. therefore the longer the transportation takes, the well-rounded it becomes
The principle that indicates rock layers separated by a valley were once continuous is called the Principle of Original Continuity. This principle suggests that sedimentary layers are deposited in continuous sheets over large areas. When a valley forms, it can erode through these layers, but the original continuity of the layers prior to erosion implies they were once part of a larger, uninterrupted sequence.
The size of the grains in a sedimentary rock can be determined by examining the texture of the rock. Coarser grains indicate a larger grain size, while finer grains indicate a smaller grain size. Other features that can provide clues to grain size include the sorting (uniformity of grain sizes) and rounding of the grains.
texture
Sedimentary rocks are often deposited in layers as strata. The feature that tells how a sedimentary rock is layered is called the bedding.
The features that indicate how a sedimentary rock is layered include bedding planes, which represent the boundaries between different layers of sediment, and graded bedding, where grains are sorted by size within a layer. Additionally, cross-bedding can show inclined layers within a sedimentary rock, indicating the direction of sediment deposition.
Sedimentary rocks are often deposited in layers as strata. The feature that tells how a sedimentary rock is layered is called the bedding.
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Grain size is more important for determining the classification of clastic sedimentary rocks, such as sandstone or shale. Composition is more important for determining the classification of chemical sedimentary rocks, such as limestone or rock salt. Layering is more important for identifying the structure of sedimentary rocks, such as bedding in sandstone or shale.
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it tells us about the transportation of sediments before deposition. i.e if a sediment has travelled a longer distance, it'll be rounder. therefore the longer the transportation takes, the well-rounded it becomes
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