For example, the progressive upward decrease in clastic grain size diameters, known as graded bedding, would allow a geologist to determine which way is stratigraphically "up"—i.e., toward the younger beds in a dipping sedimentary bed.
Confined underwater blasting, a technique used to reduce ecological harm, would dismantle the harder sedimentary bed for the hydraulic cutterhead dredge a machine that looks, according to Terri Sellers, a marine biologist working for the Army Corps of Engineers, "like an giant egg beater with teeth".
A rare exception is hydrodynamic trapping, in which high water saturation of low-permeability sediments reduces hydrocarbon permeability to near zero, resulting in a water block and an accumulation of petroleum down the structural dip of a sedimentary bed below the water in the sedimentary formation.
Confined underwater blasting, a technique used to reduce ecological harm, would dismantle the harder sedimentary bed for the hydraulic cutterhead dredge — a machine that looks, according to Terri Sellers, a marine biologist working for the Army Corps of Engineers, "like an giant egg beater with teeth".
Ice sheets flowing across a sedimentary bed usually produce a landscape of blister-like landforms streamlined in the direction of the ice flow and with each bump of the order of 102 to 103 m in length and 101 m in relief.
When a fluid such as water or air flows over a sedimentary bed, it transmits to it part of its momentum, exerting a tangential shear stress, τ0, over the contact surface that can cause movement of protruding particles and, aided by lift, the entrainment of sedimentary particles into the flow stream.
Parent rocks may be only partially reconstituted so that the original mineralogy and sedimentary bedding are partially preserved.
Although he could not explain the uplift of the sedimentary beds that formed the Appalachians, his observations were instrumental in forming the geosynclinal theory.
Between the Ardennes, the Vosges, the Massif Central, and the Massif Armoricain lie the sedimentary beds that make up the Paris Basin.
Petroleum is a naturally occurring hydrocarbon material that is believed to have formed from animal and vegetable debris in deep sedimentary beds.
Stratigraphers still use the two main principles established by the late 18th-century English engineer and surveyor William Smith, regarded as the father of stratigraphy: (1) that younger beds rest upon older ones and (2) different sedimentary beds contain different and distinctive fossils, enabling beds with similar fossils to be correlated over large distances.
