In geology and related fields, a stratum (pl.: strata) is a layer of rock or sediment characterized by certain lithologic properties or attributes that distinguish it from adjacent layers from which it is separated by visible surfaces known as either bedding surfaces or bedding planes. [1]

stratification, the layering that occurs in most sedimentary rocks and in those igneous rocks formed at the Earth’s surface, as from lava flows and volcanic fragmental deposits. The layers range from several millimetres to many metres in thickness and vary greatly in shape.

2023年11月21日 · The term rock strata refers to layers of sedimentary rock. These horizontal layers form from the processes of weathering, erosion, deposition, compaction, and cementation.

Stratigraphy is a branch of geology concerned with the study of rock layers (strata) and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks.

The strata in an exposure or outcropping of sedimentary rock can range from layers as thin as paper, known as lamina (plural: laminae or laminations) to beds tens of feet thick. Generally, the more stable and consistent the environmental conditions during deposition, the thicker the strata.

2023年2月21日 · A stratum is a rock layer with a lithology (texture, color, grain size, composition, fossils, etc.) different from the adjacent ones and several form strata. Each stratum is separated by a visible bedding surface or plane. Here is an in-depth meaning of stratum, types (bed, flow, key bed, or band), and characteristics.

Geologic strata, also known as rock layers or rock formations, are the result of the sedimentation, deposition, and cementation of minerals, rocks, and other Earth materials over millions of years. These strata provide a window into Earth’s geological history, revealing the processes that have shaped our planet and its life.

stratum, sedimentary rock layer bounded by two stratification planes, the latter being produced by visible changes in the grain size, texture, or other diagnostic features of the rocks above and below the plane. A stratum that is less than one centimetre (0.4 inch) in thickness is termed a lamina, whereas one greater than this thickness is a bed.

2021年9月23日 · Stratigraphy is the study of the distribution of sediments and sedimentary rocks in space and time. It is essential for understanding Earth history, reservoir properties, etc. Sedimentological interpretations are placed into a stratigraphic context for detailed interpretations of changes in environments over time.

2024年12月20日 · Stratification (or bedding) is expressed by rock layers (units) of a general tabular or lenticular form that differ in rock type or other characteristics from the material with which they are interstratified (sometimes stated as interbedded, or interlayered). These beds, or strata, are of varying thickness and areal extent.