Poikkikerrokselliset

Poikkikerrokselliset, also known as cross-bedded or cross-stratified sediments, are geological formations characterized by layers of sediment that are inclined relative to the main bedding planes. These structures are typically formed by the action of flowing water, such as in rivers, streams, or ocean currents. The inclination of the layers, known as cross-bedding or cross-stratification, can range from a few degrees to nearly vertical. The angle of inclination is often indicative of the energy and velocity of the fluid that deposited the sediment.

Cross-bedded sediments are common in various depositional environments, including fluvial, deltaic, and marine settings. They can provide valuable information about past sediment transport processes, water flow directions, and the energy conditions of the depositional environment. The study of cross-bedded sediments is important in paleoclimatology, paleoenvironmental reconstruction, and the interpretation of ancient sedimentary basins.

The formation of cross-bedded sediments involves the migration of sediment waves or ripples on the bed of a flowing body of water. As the sediment waves migrate, they deposit layers of sediment at an angle to the main bedding planes. Over time, these inclined layers can accumulate to form thick sequences of cross-bedded sediments. The size and shape of the sediment waves, as well as the angle of inclination, can vary depending on factors such as water depth, flow velocity, and sediment grain size.

In summary, poikkikerrokselliset or cross-bedded sediments are inclined layers of sediment deposited by flowing water. They provide important information about past sediment transport processes and depositional environments. The study of these structures is crucial in various fields of geology and earth sciences.