+A **geological layer** (or **stratum**) is a distinct unit of rock or soil, formed by natural processes and often visible as a band or sheet. These layers stack over vast spans of [Geologic Time](/wiki/geologic_time), preserving records of [Earth's History](/wiki/earth's_history) within their unique compositions and embedded [Fossil](/wiki/fossil) evidence.
+## See also
+- [Sediment](/wiki/sediment)
+- [Stratigraphy](/wiki/stratigraphy)
+- [Rock](/wiki/rock)
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