Geologic Time Scale &
Radiometric Dating
questions and answers
Proterozoic Era - answer (4.5 bya-543 mya) Primitive marine life,
single cell organisms, primitive bacteria,rocks in the Grand Canyon
started forming
Paleozoic Era - answer (543 mya- 248 mya) All continents formed
one big land mass called Pangaea. Towards the end, the continents
moved from the pole to the equator and started to break apart. 90%
of all life died. Marine life started to evolve like amphibians.
Mesozoic Era - answer (248 mya- 65 mya) This was the beginning of
the Jurassic. This includes reptiles, dinosaurs, small mammals,
birds, conifers, cycads, and flowering plants. (Mass Extinction of
dinosaurs at the end of the era)
Cenozoic Era - answer (65 mya-today) This era was the start of large
mammals and human beings. There was also many ice ages. It also
played a role in the formation of our geological features today.
1. Lifeforms, evolutions, and extinctions
2. Landforms/Rock Geology - answer What are the 2 criteria of a
Geological Time Scale?
Geological Time Scale - answer History of the earth based on
lifeforms and rocks
Relative Timescale - answer Events that occurred from the oldest at
the bottom and youngest at the top
, Absolute Timescale - answer Exact date, numerical, specific
Law of Superposition - answer Way of relative dating rocks,
youngest at the top, oldest at the bottom
Index Fossils - answer Are one of many tools geologists use to date
and correlate Earth's rock layers. Index fossils are unique because
they are the remains of organisms which lived for a relatively short
time.
Superposition - answer New rock layers forming over the place of
old ones
Relative because it doesn't show the absolute date of when they
were formed. It also goes from oldest-youngest - answer Is the Law
of Superposition Relative time or Absolute time?
There are fossils within the rock that show that some events are
older than others - answer What "evidence" is buried in the Earth's
rock?
Radiometric Dating - answer It allows us to find accurate ages for
particular layers of the earth. (chemical analysis and absolute)
It represents the entire history of the earth since its formation -
answer What does the Geological Time Scale represent
So we can see distinct changes within these time periods.
(biodiversity) (plants, animals, and landforms) - answer Why is the
Geological Time Scale broken down into periods of time?
In the Paleozoic Era, there were many living things like coral. While
in the Cenozoic Era, there were mammals and birds. So, this shows
Radiometric Dating
questions and answers
Proterozoic Era - answer (4.5 bya-543 mya) Primitive marine life,
single cell organisms, primitive bacteria,rocks in the Grand Canyon
started forming
Paleozoic Era - answer (543 mya- 248 mya) All continents formed
one big land mass called Pangaea. Towards the end, the continents
moved from the pole to the equator and started to break apart. 90%
of all life died. Marine life started to evolve like amphibians.
Mesozoic Era - answer (248 mya- 65 mya) This was the beginning of
the Jurassic. This includes reptiles, dinosaurs, small mammals,
birds, conifers, cycads, and flowering plants. (Mass Extinction of
dinosaurs at the end of the era)
Cenozoic Era - answer (65 mya-today) This era was the start of large
mammals and human beings. There was also many ice ages. It also
played a role in the formation of our geological features today.
1. Lifeforms, evolutions, and extinctions
2. Landforms/Rock Geology - answer What are the 2 criteria of a
Geological Time Scale?
Geological Time Scale - answer History of the earth based on
lifeforms and rocks
Relative Timescale - answer Events that occurred from the oldest at
the bottom and youngest at the top
, Absolute Timescale - answer Exact date, numerical, specific
Law of Superposition - answer Way of relative dating rocks,
youngest at the top, oldest at the bottom
Index Fossils - answer Are one of many tools geologists use to date
and correlate Earth's rock layers. Index fossils are unique because
they are the remains of organisms which lived for a relatively short
time.
Superposition - answer New rock layers forming over the place of
old ones
Relative because it doesn't show the absolute date of when they
were formed. It also goes from oldest-youngest - answer Is the Law
of Superposition Relative time or Absolute time?
There are fossils within the rock that show that some events are
older than others - answer What "evidence" is buried in the Earth's
rock?
Radiometric Dating - answer It allows us to find accurate ages for
particular layers of the earth. (chemical analysis and absolute)
It represents the entire history of the earth since its formation -
answer What does the Geological Time Scale represent
So we can see distinct changes within these time periods.
(biodiversity) (plants, animals, and landforms) - answer Why is the
Geological Time Scale broken down into periods of time?
In the Paleozoic Era, there were many living things like coral. While
in the Cenozoic Era, there were mammals and birds. So, this shows
