Rock Layers
True or False. A layer that is beneath another layer of rock would be older.
What is true.
This fossil forms when sediments bury an organism, the organism decays, and leaves a cavity in the organism's shape.
What is a Mold?
Were humans present during the age of dinosaurs?
No.
What caused the mass extinction that ended the Mesozoic Era?
This law states that lower layers of rocks in a series are older and upper layers of rocks are younger.
What is law of superposition?
forms when a mold is filled with sand or mud that hardens into the organism's shape.
What is a Cast?
The longest geological time is referred to as?
Precambrian.
Give two characteristics about the Paleozoic time period.
Pangaea, fish, mass extinction, invertebrates....
Specific fossils that were widespread but only lived for a short period in Earth's history. These help us determine the age of a rock layer.
What are index fossils?
Organism's footprint, trail, or burrow.
What are Trace Fossils?
An intrusion is always older or younger than the rock layers that it cuts through?
What is younger?
What era is referred to as the age of mammals?
What is the Cenozoic era?
T/F You can sometimes tell the age of fossils by comparing them to similar rocks they are next to.
What is True?
Forms when organisms are pressed between layers of rock, squeezing almost all the decaying organisms away and leaving the an imprint in the rock.
What is Carbon Film?
a fracture along which blocks of the Earth's crust are caused by the shifting or dislodging of the Earth's crust is called what?
What is a Fault?
The first living organisms, cyanobacteria, formed in which time period?
What is Precambrian?
This era is known as the age of fish.
What is the Paleozoic era?
This is the type of age we use when comparing a rock layer to another rock layer.
What is relative age?
Preserved fossils form when entire organisms or parts of organisms are prevented from decaying by being trapped in what two things...?
What is Ice or Amber?
The Law of __________ states that a geologic feature is younger than the features it cuts across.
In what era did flowering plants appear?
What is the Mesozoic era?