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Fossils and Geologic Time

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Kiwi01
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Last updated: October 26, 2022
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First submittedOctober 26, 2022
Times taken39
Average score15.5%
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Hint
Answer
A record of Earth's history from 4.6 bya to the present
Geologic time scale
Age of the Earth
4.6 byo
What rock is put down in horizontal layers?
Sedimentary
Law stating that the oldest rock layers are on the bottom, and get younger going up
Law of Superposition
Gaps in the rock sequence
Unconformities
Stratified rock rests upon a layer of weathered unstratified rock
Nonconformity
Rocks deposited in horizontal layers are folded or tilted, then eroded
Angular Unconformity
Rocks were exposed and eroded then new layers were deposited on top
Disconformity
Law stating a fault or intrusion is always younger than the surrounding rock
Law of crosscutting
What can be determined by the rate at which a stream erodes its bed?
Age of the stream
What are alternating layers of dark and light rock particles?
Varves
Looking at the amount of a radioactive isotope and the daughter material
Radioactive decay
The amount of time it takes for one half an isotope to decay
Half-life
What is found almost exclusively in sedimentary rock?
Fossils
What is the preservation of organisms?
Original Remains
Types of original remains
Mummification
 
Amber
 
Tar seeps
 
Freezing
Original organic material replaced by new materials
Petrified Remains
What must happen in order for an organism to become a fossil?
Covered quickly and completely
Preserved 'footprint' of an organism
Trace fossils
A thin carbon residue outline left after heat and pressure force liquid and gases out
Carbonaceous Film
Cavity left when an organism dies and decays
Mold
Fossil formed when natural cements fill in mold and harden
Cast
Fossilized waste material
Coprolites
Fossilized stones some dinos used in digestion
Gastroliths
Fossils found exclusively in rock layers of a certain geologic age
Index fossils
Largest period of geologic time
Eon
Hint
Answer
Second largest period of geologic time
Era
Third largest
Period
Smallest
Epoch
Three eras
Paleozoic
 
Mesozoic
 
Cenozoic
Organisms developed what during Paleozoic era?
Hard parts
Longest geologic time unit of Earth's history
Precambrian
Periods of above
Cambrian
 
Ordovician
 
Silurian
 
Devonian
 
Mississippian
 
Pennsylvanian
 
Permian
What happened during Permian period?
Mass extinctions
Periods of Cenozoic era
Tertiary
 
Quaternary
Periods of Mesozoic era
Triassic
 
Jurassic
 
Cretaceous
What evolved during Quaternary?
Humans
What broke up during Triassic?
Pangaea
What appeared during Jurassic?
Birds
What appeared during Cambrian?
Invertebrates
What appeared during Ordovician?
Vertebrates
What evolved during Silurian?
Spiders and millipedes
Silurian is also called?
Age of fishes
What occurred during Cenozoic?
Ice Ages
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