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Was the 19th century the geologic time scale was based primarily on sequence of fossils in the rock record?
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What geologic period has fossils of the most primitive lifeforms?
cambrian
Organism that formed index fossils when?
Short spans of geologic time
When did organisms that formed index fossils?
Short spans of geologic time
What are the geologic periods named from?
Most geologic periods are named for the location where rock formations were first found that contained fossils from that period, some others (e.g. Carboniferous) were named for materials associated with the fossils.
What is the relative age of fossils found at the top layer of rock?
They are called index fossils, fossils of organisms that were widespread, evolving quickly, and only appeared in the geologic column for a specific length of time.
What is a geologic column?
An ideal sequence of rock layers that contains all the known fossils and rock.
How do geologist us the geologic column?
To help them interpret rock sequence .
What is the remains of organisms preserved by geologic process?
The remains are called fossils.
What the geologic column?
It is an imaginary column where are the ages of rocks sit on top of one another in their proper age sequence, oldest at the base and youngest at the top. An ideal sequence of rock layers that contains all the known fossils and rocks whith each sequence is given its name.
How paleontologists use trilobite use fossils as index fossils for various geologic time periods?
yeah
What geologic period has fossils of the most primitive lifeforms?
cambrian
Organism that formed index fossils when?
Short spans of geologic time
To what geologic time frame do the fossils from Thomas Farm belong?
Miocene
For which segment of the Earth's geologic history are fossils rarely found?
precambrian
When did organisms that formed index fossils?
Short spans of geologic time
What are the geologic periods named from?
Most geologic periods are named for the location where rock formations were first found that contained fossils from that period, some others (e.g. Carboniferous) were named for materials associated with the fossils.
What geologic period has fossils that closley resemble organisms living today?
Tirtiary
