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  2. Marker horizon - Wikipedia

    en.wikipedia.org/wiki/Marker_horizon

    A well-known example of a key bed is the global layer of iridium-rich impact ejecta that marks the Cretaceous–Paleogene boundary (K–T boundary). Palynology , the study of fossil pollens and spores, routinely works out the stratigraphy of rocks by comparing pollen and spore assemblages with those of well-known layers—a tool frequently used ...

  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. Harris matrix - Wikipedia

    en.wikipedia.org/wiki/Harris_matrix

    Animation showing interpretive grouping and phasing on matrix diagram. The Harris matrix is a tool used to depict the temporal succession of archaeological contexts and thus the sequence of depositions and surfaces on a 'dry land' archaeological site, otherwise called a 'stratigraphic sequence'.

  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. Sequence stratigraphy - Wikipedia

    en.wikipedia.org/wiki/Sequence_stratigraphy

    Sequence Stratigraphy authoritative online encyclopedia from SEPM, a scientific society whose publications have been central to defining sequence stratigraphy. An Online Guide to Sequence Stratigraphy by the University of Georgia's Stratigraphy Lab. USC's Sequence Stratigraphy Web a fairly extensive online education resource

  7. Stratigraphy (archaeology) - Wikipedia

    en.wikipedia.org/wiki/Stratigraphy_(archaeology)

    Archaeological stratigraphy at the Iron Age site of Goosehill Camp on Bow Hill, West Sussex in Southern England. Neat stratification in Athens (Ceramicus Cemetery). Stratigraphy is a key concept to modern archaeological theory and practice. Modern excavation techniques are based on stratigraphic principles.

  8. Cross section (geology) - Wikipedia

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

    The letters A and B at the top correspond to the line labeled A--B on the smaller map. In this example, the vertical scale is exaggerated compared to the horizontal scale. A cross section or cross-section , in geology , is a diagram representing the geologic features intersecting a vertical plane , and is used to illustrate an area's structure ...

  9. Hillside letters - Wikipedia

    en.wikipedia.org/wiki/Hillside_letters

    Built-up letters made from rocks and concrete are the most common. Other materials such as wood, old car tires, metal, and vinyl have also been used. The M in Missoula, Montana, for the University of Montana, is an example of a built-up letter. Painted letters are typically found on bare rock faces and cliffs, as is the G in The Gap, Arizona.

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