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Well, there have been several "great extinctions" in earth's history, but the most recent one was the Cretaceous-Tertiary event, ending the Cretaceous. That was c. 65 million years ago.
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What do the periods the geologic time scale represent?
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
What marks the end of a geologic period?
Each era on the scale is separated from the next by a major event or change. Different spans of time on the time scale are usually delimited by major geological or paleontological events, such as mass extinctions.
Why are some units of geologic time scale longer and some shorter?
Because its whenever something drastic happens, or a dominant animal dies off and new ones come in.
What is the name for the modern era which began approximtely 65 million years ago with the mass extinction of the dinosaurs?
The Cretaceous period ended with the extinction of the dinosaurs. The period that followed the mass extinction was called the Paleocene. This was a time of the mammals.
What is the largest division of time on geologic time scale?
Eon
What were the major geologic events in Jurassic time period?
The existence and extinction of the dinosaurs.
What unit of geologic time followed the mass extinction of dinosaurs?
Jurassic period
Is the Jurassic period a geologic time that followed the mass extinction of dinosaurs?
No. The Jurassic was in the middle of the dinosaurs' reign on Earth. The time period after the extinction of the dinosaurs is referred to as the Paleogene or the Tertiary.
What do periods on the geologic time scale represent?
An era, in geologic terms, is a geological time period encompassing two or more geologic periods.
Why is the geologic time scale used to show the Earth's history?
because the time span of earth past is so great geologic
What do the periods the geologic time scale represent?
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
What ended the permian period?
The Permian Period was ended by the Permian/Triassic Extinction Event, which wiped out 90% of the species on Earth at that time.
How did geologists determine the division of the geologic time scale?
fossils contained within the rock. got answers from Earth Science book while doing my HW
What event ended the paleozoic and mesozoic era?
Extinction did.
What marks the end of a geologic period?
Each era on the scale is separated from the next by a major event or change. Different spans of time on the time scale are usually delimited by major geological or paleontological events, such as mass extinctions.
What do the relative geologic time and absolute geologic time combine to form?
The geologic time scale.
Why are some units of geologic time scale longer and some shorter?
Because its whenever something drastic happens, or a dominant animal dies off and new ones come in.
