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How did geologists determine the division of the geologic time scale?
Wiki User
∙ 11y ago
fossils contained within the rock.
got answers from Earth Science book
while doing my HW
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoThey are generally based on the dominant life forms, climate, and extinction events.
Wiki User
∙ 11y agoThe answer before this was smart alec and stupid so I'm just typing this instead so you know not to look at this.
Wiki User
∙ 12y agoGeologists decide when one division of the geologic time scale ends by a mass extinction.
Wiki User
∙ 7y agoThey use the geologic column.
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What information did geologists use to develop the geologic time scale?
Radiometric dating and association of fossils with time scales during the periods when life existed.
What is the purpose of the geologic time scale?
The scale outlines the development of Earth and life on Earth.
Why did geologists develop the geologic time scale?
The geological time scale is the geologic history of the planet from formation to the present. It starts with large divisions of time called eons and is subdivided into successively smaller units of time based on dominant lifeforms, extinction events, even climate. The development of the geologic time scale was initially based on the observation and reasoning that deeper layers of rock are generally older than less deep layers in what is called the "Law of Superposition".Paleontologists look for index fossils in fossil bearing sedimentary rock. Index fossils are organisms that were widespread, rapidly evolving, and only existed for a short period of time as evidenced by their appearance in the fossil record of specific rock strata. The appearance of a fossil alongside an index fossil gives a rough approximation of the age of the fossil in relative terms as it would appear on the geologic time scale. The appearance of the same fossil alongside index fossils of different geologic ages means that the fossil organism spanned multiple geologic time periods. Associations of specific strata alongside radiographically datable igneous and metamorphic rock determines the absolute age of a fossil.A period of around 4,600,000,000 years, the largest groupings of geologic time are eons, followed in descending order by era, period, epoch, and age.The geologic time scale is very important, especially in fields involving the exploration and retrieval of fossil fuels, which are geologically date range specific.
What is called the record of life forms and geologic events in earth's history?
the record of life forms and geologic events in earth's history is actually called the "Geologic time scale" fine sir. good day
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.
How did geologists determine the divisions of the geologic time scale?
Mainly abrupt changes in mineral layers or the fossils in them.
What word represents the broadest division on a geologic time scale?
Precambrian is the largest division of the geologic time scale.
How did geologists decide where one division division of the geologic time scale ends and the next?
The answer before this was smart alec and stupid so I'm just typing this instead so you know not to look at this.
What kind of scientists worked with geologists to develop the geologic time scale?
biologists
How did the geologists decide where the division of the geologic time scale ends and begins?
The answer before this was smart alec and stupid so I'm just typing this instead so you know not to look at this.
Geologists have divided earths history in the manaeable units that are represented by the?
Geologic time scale
Which is the smallest division of time on the geologic scale?
Epoch
What division in the geologic time scale is the shortest?
epoch
How did geologists decide where on division of the geologic time scale ends and the next begins?
The answer before this was smart alec and stupid so I'm just typing this instead so you know not to look at this.
The largerest division of time on the geologic time scale is?
Eon.
What methods did geologists use when they first developed the time scale?
The methods the geologists used when they first developed the geologic time scale. Were studying rock layers and index fossils worldwide. By Patrick
What divides the history Earth into time units that help geologists analyze the rock record?
Geologic Time scale
