Define This
What is geologic time?
Geologic time refers to all the time that has passed since the earth formed.
A type of fossil where the remains of the organism do not persist, leaving a hollow imprint on the sedimentary rock.
Mold Fossil
The evolution of crust, mantle and core happened during this era.
Precambrian Era
What is the 3rd step during the fossil formation?
As the remains break down, it leaves holes in the sediment, which are then filled by minerals.
How old is the Earth according to the Scientists estimation?
4.6 billion years old
What are fossils?
Fossils are the remains of ancient species that have been preserved, or evidence of their remains.
These are the imprints of organisms that were crushed under a lot of pressure and left a perfect outline on the surface. What type of fossil is this?
Carbon Film
First reptiles, giant insects, ferns, conifers, amphibians, vertebrates, snails and seaweeds are the forms of life during this era.
Paleozoic Era
What is the 1st step during fossil formation?
When an organism dies, its soft parts often decompose or are eaten by animals.
What year did the Precambrian Era ended?
570 million years ago
What is an era?
When "periods" are compacted together according to their characteristics, this geologic division will comprise the so-called "era."
These are the traces of previous life forms. These can be the day-to-day activities that are preserved and fossilized which are called?
Trace Fossil
Many mammals appeared. Human dominated during this era.
Cenozoic Era
What is the 5th step during fossil formation?
The fossil will eventually come to the surface as a result of weathering and erosion.
What year did Palezoic era ended?
230 million years ago
What is a period?
A "period" is a basic unit of geological time during which a specific kind of rock system is produced.
It is the opposite side of mold fossil. The cast preserves a three-dimensional impression of remains buried in sediment.
Fossil Cast
Colorado Plateau begins, rise of Sierra Nevadas and Coast Ranges, Palisades of Hudson River form during this era.
Mesozoic Era
What is the 2nd step of fossil formation?
The remains of organisms are covered by sediments. These sediments become rock.
The Mesozoic Era ended in what year?
65 million years ago
What is an epoch?
Some "periods" have their own subdivision; these geologic subdivisions are called "epochs."
This type of fossil are the remains of an organism that have turned into a mineral, rock, or stone through the process of petrification.
Petrified Fossil
Variety of dinosaurs existed during this era. The end of this era is the end of dinosaurs as well.
Mesozoic Era
What is the 4th step of fossil formation?
The result is a copy of the organism made out of minerals.
What year did Cenozoic Era began?
began 65 million years ago