Show:
Finding Relative Age
Finding Absolute Age
Precambrian/Paleozoic
Mesozoic
Cenozoic
100
In the law of superposition, the bottom layer is always _______________ than the top layer
Older
100
This is the simplest way of estimating absolute age, yet the most unreliable as well.
rates of erosion or deposition
100
The Earth's supercontinent that existed in Paleozoic Era was...
Pangaea
100
This kind of animals were prosperous in Mesozoic Period
Reptiles
100
The animal that prospered in this period
mammals
200
Almost all fossils are discovered in this kind of rock.
Sedimentary Rock
200
This is usually found in the glacial lakes, and is able to identify the annual cycle of deposition
Varve
200
This is the longest era, yet not much evidence has been found, due to lack of fossils
Precambrian era
200
Dinsaurs were not only considered as the ancestors of reptiles but also...
Birds
200
Few of this was the cause of extinction of some animals in this era
Ice Age
300
A gap in the sequence of the rock layers is called...
Unconformity
300
Name two types of radiometric dating.
Half-life and Radioactive Isotopes
300
Some of the early vertebrates were...
Fish
300
This is the first period of the Mesozoic Era where dinosaurs first appeared
Triassic Period
300
The definition of the big-sized animals in this period
Megamammals
400
Insects trapped in sticky saps are called...
Amber
400
200g of Carbon-14 decays into 6.25g in 10 years. How many years is its half-life?
2 years
400
During the Cambrian Period, the ocean was _________ and _________ that the small marine animals were able to prosper.
warm shallow
400
This dinosaur was common in Cretaceous Period. It had an armored body
ankylosaurs
400
the period of this epoch was between 23.0Ma and 5.3 Ma
Milocene
500
This type of unconformity is formed after the magma cools and then uplifts earth's surface by forming igneous rock.
nonconformity
500
Where can the mummified remains be found? How are they preserved with minimal decomposition?
.
500
M7's favorite kind of Paleozoic Animal. It's a bug-looking animal that lived in the ocean.
Trilobites
500
The mass extinction happened in the Mesozoic Era is called...
Creteous extinction
500
by this epoc, ice sheets began to spread, and first glacial caps existed
Pliocene Epoch