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  2. Absolute dating - Wikipedia

    en.wikipedia.org/wiki/Absolute_dating

    Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy. [ 1 ][ 2 ] Absolute dating provides a numerical age or range, in contrast with relative dating ...

  3. Relative dating - Wikipedia

    en.wikipedia.org/wiki/Relative_dating

    Relative dating is the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age (i.e., estimated age). In geology, rock or superficial deposits, fossils and lithologies can be used to correlate one stratigraphic column with another.

  4. San Joaquin antelope squirrel - Wikipedia

    en.wikipedia.org/wiki/San_Joaquin_Antelope_Squirrel

    Physical Characteristics. The San Joaquin antelope squirrel is dull yellowish-brown or buffy-clay in color on upper body and outer surfaces of the legs with a white belly and a white streak down each side of its body in the fashion of other antelope squirrels. [2] The underside of the tail is a buffy white with black edges. [2]

  5. Geologic time scale - Wikipedia

    en.wikipedia.org/wiki/Geologic_time_scale

    The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale (GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses ...

  6. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details ...

  7. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS. It features calculation or computation capabilities, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications (VBA). Excel forms part of the Microsoft 365 suite of software.

  8. Dreamspell - Wikipedia

    en.wikipedia.org/wiki/Dreamspell

    v. t. e. The Dreamspell is an esoteric calendar in part inspired by the Maya calendar by New Age spiritualist, Mayanist philosopher, and author José Argüelles and Lloydine Burris Argüelles. The Dreamspell calendar was initiated in 1987 and released as a board game in 1990.

  9. Uranium–thorium dating - Wikipedia

    en.wikipedia.org/wiki/Uranium–thorium_dating

    Uranium–thorium dating. Uranium–thorium dating, also called thorium-230 dating, uranium-series disequilibrium dating or uranium-series dating, is a radiometric dating technique established in the 1960s which has been used since the 1970s to determine the age of calcium carbonate materials such as speleothem or coral. [1][2] Unlike other ...