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2. Geologic time scale - Wikipedia

   en.wikipedia.org/wiki/Geologic_time_scale

   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 chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).

3. Geological history of Earth - Wikipedia

   en.wikipedia.org/wiki/Geological_history_of_Earth

   Geologic time shown in a diagram called a geological clock, showing the relative lengths of the eons of Earth's history and noting major events The geological history of Earth follows the major geological events in Earth's past based on the geologic time scale , a system of chronological measurement based on the study of the planet's rock ...

4. List of time periods - Wikipedia

   en.wikipedia.org/wiki/List_of_time_periods

   Modern history – After the post-classical era Early modern period – The chronological limits of this period are open to debate. It emerges from the Late Middle Ages (c. 1500), demarcated by historians as beginning with the fall of Constantinople in 1453, in forms such as the Italian Renaissance in the West, the Ming dynasty in the East, and ...

5. Deep time - Wikipedia

   en.wikipedia.org/wiki/Deep_time

   In Time's Arrow, Time's Cycle, Gould cited one of the metaphors McPhee used in explaining the concept of deep time: Consider the Earth's history as the old measure of the English yard, the distance from the King's nose to the tip of his outstretched hand. One stroke of a nail file on his middle finger erases human history. [1]

6. Timeline of natural history - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_natural_history

   Geologic time is the timescale used to calculate dates in the planet's geologic history from its origin (currently estimated to have been some 4,600 million years ago) to the present day. Radiometric dating measures the steady decay of radioactive elements in an object to determine its age. It is used to calculate dates for the older part of ...

7. Chronostratigraphy - Wikipedia

   en.wikipedia.org/wiki/Chronostratigraphy

   Chronostratigraphy is the branch of stratigraphy that studies the ages of rock strata in relation to time.. The ultimate aim of chronostratigraphy is to arrange the sequence of deposition and the time of deposition of all rocks within a geological region, and eventually, the entire geologic record of the Earth.

8. Yarmouthian (stage) - Wikipedia

   en.wikipedia.org/wiki/Yarmouthian_(stage)

   Later, the Yarmouth (Yarmouthian) stage in Illinois was defined on the basis of the Yarmouth Paleosol (Soil), developed in the surface of what were thought at that time to be "Kansan" glacial tills, and buried by Illionian glacial tills of the Glasford Formation in southeast Iowa and east-central Illinois. At this time, it was incorrectly ...

9. Erathem - Wikipedia

   en.wikipedia.org/wiki/Erathem

   These changes, along with tectonic activity left chemical trails (red bed formation, etc.) and other physical clues (magnetic orientation, layer formation factors) in the rock record, and it is these changes along with the later richer fossil record which specialists use to demarcate times early in planet earth's history in various disciplines.