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The geologic time scale divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet. These divisions are called geochronologic units (geo: rock, chronology: time).
Explain the relationships among eons, eras, epochs and periods of the geologic time scale. Eons are the largest spans of time in the geologic time scale. Eons are divided into smaller units called eras. Eras are subdivided into periods. Periods are subdivided into even smaller time spans called epochs. 2.
Pleistocene, it’s given special status as the warm time frame when agriculture and civilisation arose. The graph on the next page shows the glacial and interglacial cycles reconstructed by the European Project for Ice Coring in Antarctica (EPICA) Dome C ice core.
Summarize the history of the geological time scale and the relationships between eons, eras, periods, and epochs. Understand the importance and significance of unconformities. Estimate the age of a rock based on the fossils that it contains.
Geologic Time Scale. Introduction: The geologic time scale was developed by scientists as a means of representing the evolutionary history of Earth. Geologists in the 1700’s and 1800’s began to put together a timeline for the order in which different groups of rocks and fossils were formed.
In this Laboratory Activity you will compare and contrast various segments of Earth’s history by constructing a geologic time line. Strategy. You will make a graph to compare the durations of Earth’s geologic eras. You will measure and construct a time line that shows Earth’s geologic eras.
Pleistocene Epoch, earlier and major of the two epochs of the Quaternary Period of Earth’s history, an epoch during which a succession of glacial and interglacial climatic cycles occurred. It ended 11,700 years ago. It was preceded by the Pliocene Epoch and followed by the Holocene Epoch.
