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2. Bed (geology) - Wikipedia

   en.wikipedia.org/wiki/Bed_(geology)

   According to both the North American Stratigraphic Code and International Stratigraphic Guide, a bed is the smallest formal lithostratigraphic unit that can be used for sedimentary rocks. A bed, a stratum , is the smallest formal unit in the hierarchy of sedimentary lithostratigraphic units and is lithologically distinguishable from other ...

3. Stratigraphy - Wikipedia

   en.wikipedia.org/wiki/Stratigraphy

   Stratigraphy is a branch of geology concerned with the study of rock layers and layering (stratification). It is primarily used in the study of sedimentary and layered volcanic rocks . Stratigraphy has three related subfields: lithostratigraphy (lithologic stratigraphy), biostratigraphy (biologic stratigraphy), and chronostratigraphy ...

4. Contact (geology) - Wikipedia

   en.wikipedia.org/wiki/Contact_(geology)

   The older country rock is crosscut by a younger magmatic body. The nature of the intruding body depends on its composition and depth. Common examples are igneous dikes, sills, plutons, and batholiths. Depending on the composition of the magma, the intrusive body may have a complex internal structure which can provide insight into its emplacement.

5. List of Global Boundary Stratotype Sections and Points

   en.wikipedia.org/wiki/List_of_Global_Boundary...

   This is a list of Global Boundary Stratotype Sections and Points.Since 1977, Global Boundary Stratotype Sections and Points (abbreviated GSSPs) are internationally agreed upon reference points on stratigraphic sections of rock which define the lower boundaries of stages on the geologic time scale.

6. Geology of Namibia - Wikipedia

   en.wikipedia.org/wiki/Geology_of_Namibia

   Werner, Mario (2006), The stratigraphy, sedimentology, and age of the Late Palaeozoic Mesosaurus Inland Sea, SW-Gondwana - New implications from studies on sediments and altered pyroclastic layers of the Dwyka and Ecca Group (lower Karoo Supergroup) in southern Namibia (PhD thesis) (PDF), Julius-Maximilians-Universität Würzburg, pp. 1– 428

7. Lithology - Wikipedia

   en.wikipedia.org/wiki/Lithology

   Examples of lithologies in the second sense include sandstone, slate, basalt, or limestone. [ 4 ] Lithology is the basis of subdividing rock sequences into individual lithostratigraphic units for the purposes of mapping and correlation between areas.