Fossil Types
Steno's Laws
The Geologic Time Scale
Fossils 2
Random
100
Which type of fossils is a hollow impression left in a rock after an organism's remains decay and dissolve?
Molds
100
Which of steno's law states that older strata are below younger strata?
The law of superposition
100
What is the definition of the geologic time scale from your review?
A record of the geologic events and the evolution of life forms as shown in the fossil record
100
The dinosaur named sue was discovered in what year in what state?
1990 in South Dakota
100
Scientists who study fossils are called _____________
Paleontologists
200
Which type of fossils are replicas of an organism that forms when minerals or sediment fills a natural mold and hardens?
Casts
200
Which of Steno's Laws states that sediment is originally deposited in uninterrupted horizontal layers
The law of original horizontality
200
What is the principle of uniformitarianism?
A principle that state processes that operate today also operated in the past.
200
Explain how fossils form in your own words
Living things die and are buried by sediment. The sediment turns to rock and preserves the organism's remains.
200
True or false: Wood can become petrified
True
300
A ___________ fossil forms when the remains of an organism are replaced by minerals and turned to stone
Petrified Fossils
300
Which law states that an intrusion that cuts through strata is younger than the strata themselves?
The law of cross cutting relationships
300
If Earth's history was condensed into 24 hours, at about what time would humans appear?
11:59 PM
300
What is the difference between body and trace fossils?
Body fossils form from physical remains. Trace fossils give evidence of an organism's behavior.
300
What does the word petrified mean?
Turned to stone
400
When whole organisms become preserved in tar, amber, or ice they are known as ________________
Preserved Remains
400
Which of steno's laws states that sedimentary rock layers initially extend laterally in all directions until they thin out or encounter a barrier
Law of lateral continuity
400
What are the major divisions of the geologic time scale in order from largest to smallest?
Eons, Eras, Period, Epochs, Ages
400
Most fossils form near water because
Sediment builds quickly there due to erosion and deposition. The faster an organism is covered by sediment the better chance it has of becoming a fossil.
400
A mass extinction event is declared when at least ______ % of Earth's biodiversity is lost in a relatively short period of time.
75%
500
Which type of fossil can be extremely detailed? 
Carbon Films
500
Which of Steno's laws states that fossilized organisms appear and disappear in the rock record in a specific, predictable sequence
The law of faunal succession
500
What is the current Eon, Era, and Period?
Eon- Phanerozoic
Era-Cenozoic
Period- Quaternary
500
What does finding aquatic fossils in Ohio tell us about the state's past climate?
It was once under water (part of an ocean)
DAILY DOUBLE
500
How does the fossil record show extinction?
It shows around what time period fossils of specific organisms disappeared, meaning that none were left alive to become fossils.