Geologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago).
Timelines are often used in history textbooks and biographies -- they explain what happened during a certain period of time or to a particular person, starting with the earliest event and moving forward through time. The below Geologic timeline illustrates the evolution of humankind and other animals. As the graphic depicts, the Earth had formed an estimated 4540 million years ago. Earth’s crust had then cooled enough around 4000 million years ago, allowing continents and life to form. The below infographics then explains the Paleozoic era and how the first reptiles came into being—followed by the Mesozoic era and the rise and fall of Dinosaurs that ultimately lead to the Cenozoic era where the first mammals surfaced on the Earth’s land. Instead of using complex software that requires you to pay a hefty sum, you can use the free timeline maker EdrawMax that provides you 100% customizable free templates. After your editing, you can share these timeline diagrams in PNG, JPG, or PDG, or any other format deemed required from your side.
Modern examples of canyon formation and erosion provide models to explain how many geological formations can be described by the Flood and its aftereffects.
The geologic time scale shows major evolutionary events from 650 million years ago to the present.
The geologic time scale (GTS) is a system of chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and ot
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Get to know your Jurassic from your Cretaceous in this handy geologic time periods chart.
Geologic time is unimaginably long. Geologists puzzle it out using a calendar called the Geologic Time Scale.
The geologic time scale is split into four major eras–Precambrian, Paleozoic, Mesozoic, and Cenozoic, and are subdivided into periods. The number beside the era or period in the infotoon below shows how many years ago it began. I thought it would be fun to show it as walk through the park. This would also make
Geologic time is one of the last topics I cover in my biology class. We discuss it briefly throughout the year when we learn about ecological succession and evolution, but we don’t take a deeper dive until the end of the year. I absolutely LOVE any excuse to get out my fossil collection!Here is a ... Read more
Image showing the Stairway of Time. Each era is linked to a page with more detailed information about that specific era. Please have someone assist you with this.
Geologic maps use a combination of colors, lines, and symbols to depict the relative age, composition, and relationships among rocks and sediments at and near the earth’s surface. Includes 7.5', 30x60', and 1x2-degree quadrangle maps.
A type experiment that responds to the environment
We spent about a week learning about Earth’s four eons and most recent eras. Today I wanted to share several of the activities we did to go along with this part of our unit. As you may recall, we reviewed the planets in the Solar System, talked about the age of the Earth (4.6 Billion years) and did an impressionistic activity to show how short human history actually is compared to...
Precambrian The Precambrian, dating 4.5-544 million years ago (mya), marks the period of Earth's history from its initial formation to th...
This is a Geologic Timeline Worksheet. Students analyze a geologic timeline with major events in the geologic record. They then answer questions using the timeline. This assignment is for middle school or high school (7th-10th) Earth science classes.This product contains 4 pages and a key.Geologic t...
A PDF version is available for download from the Geological Society of America.
