describe the main features of sedimentary rocks ??
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bedding:bedding is the most obivious feature of sedimentary rocks nd consist of lines called bedding planet . which mark the boundries of different layers of sediment.
graded beds are common when sediment is deposited by a slow-moving current.The base of the bed consists of coarser material, which settles to the bottom first. The subsequent beds grade upward through sand and silt, to the finest clay sizes at the top. This pattern is typical in submarine turbidity flows, where sediments are dislodged and tumble down an ocean floor slope.
Fossils. Fossils are the remains of plants or animals buried in sediments that were later lithified into rock. They can be extremely useful in determining the depositional environment and the age of the rock. The most obvious fossils are those parts of an organism that have been preserved by being replaced by calcite or silica during lithification. A fossil can also be a cast that formed when the organic remains dissolved, leaving an opening, or mold, shaped like the organism and later filled with calcite or silica. Other types of fossils include tracks, worm trails, feces, and burrows.
Desiccation cracks and ripple marks. Common structures preserved in sedimentary rocks can be seen forming today along beaches and rivers. Desiccation cracks, or mud cracks, develop when a muddy sediment is exposed to air and begins to dry out, creating a polygonal pattern of cracks. Ripple marks are gentle repeated ridges, usually in sand or silt, that are formed perpendicular to the flow of wind or water.