Image: Wikimedia Commons

stratum

Layer of sedimentary rock or soil with internally consistent characteristics

EntityQ12758989

Also known as strata · rock strata · rock layers

Subclass of: layer
Part of: Earth's crust

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

In geology and related fields, a stratum 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. Prior to the publication of the International Stratigraphic Guide, older publications have defined a stratum as being either equivalent to a single bed or composed of a number of beds; as a layer greater than 1 cm in thickness and constituting a part of a bed; or a general term that includes both bed and lamina. Related terms are substrate and substratum (pl.substrata), a stratum underlying another stratum.

Overview

All data

14 statements · 29% with external sources · numbers in brackets are citations

Studied by: stratigraphy

On other databases

12 identifiers linking stratum across the web's reference databases

Data quality

statements

29%

externally sourced

Source last edited August 31, 2026. AIDB refreshes this page daily.

Suggest a fact or correction

Links

Use this data

curl https://aidb.si/api/v1/entities/Q12758989

API docs, limits & keys

Cite this page

AIDB. (2026). stratum (Q12758989). Retrieved from https://aidb.si/e/stratum-Q12758989