Stratum - Wikipedia
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 …
Stratification | Types, Causes & Effects | Britannica
stratification, the layering that occurs in most sedimentary rocks and in those igneous rocks formed at Earth’s surface, as from lava flows and volcanic fragmental deposits. The layers range from several …
Fossils, Rocks, and Time: Rocks and Layers
Rock layers are also called strata (the plural form of the Latin word stratum), and stratigraphy is the science of strata. Stratigraphy deals with all the characteristics of layered rocks; it includes the study …
Rock Strata Definition, Formation & Importance - Study.com
What is Rock Strata? Rock strata can be defined as horizontal layers of sedimentary rock, which are usually visually distinguishable from adjacent layers due to their differing composition.
What Are Rock Strata and How Do They Form? - Biology Insights
Aug 4, 2025 · Rock strata, also known as beds or layers, are visually identifiable bands of rock that often vary in color, texture, and composition. These layers can be horizontal or tilted, and their distinct …
Stratum Definition - Earth Science Key Term | Fiveable
A stratum is a distinct layer of rock or sediment that has formed over time, often representing a specific period in geological history. Strata can vary in thickness, composition, and fossil content, which can …
Understanding Stratum in Geology, Including Types and Examples
Feb 21, 2023 · What is a stratum in geology? In geology and related studies, a stratum (plural strata) is defined as a sediment or rock layer with certain lithologic properties (texture, color, grain size, …
Geology of Texas - Wikipedia
The geology of west Texas is arguably the state's most complex, with a mix of exposed Cretaceous and Pennsylvanian strata, overlain by Quaternary conglomerates. A series of faults trend southeast to …
Stratum | Rock Layers, Stratification & Sedimentary Rocks | Britannica
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 …
CHAPTER 9 (Stratigraphy) - University of Houston
In 1669, Steno stated three basic principles for chronological analysis of the rock record which have proven to be extremely useful in the study of earth history. (a) Principle of superposition: In a …