Topics 8-10 Flashcards
What are original remains?
A type of fossil in which all or part of the organism is preserved
What is a trace fossil?
A type of fossil in which evidence of animal activity has been preserved
What is a cavity in rock left when the hard parts of an organism dissolve?
Mould
What is produced when sediments fill in the cavity?
Cast
On the geologic time scale, what are the three eras?
Cenozoic, Mesozoic, Paleozoic
What are oil, natural gas, and coal examples of?
Fossil fuels
What was the earliest supercontinent?
Rodinia
What can be used to determine the relative age of strata?
Index fossil
What are the layers of rock also called?
Strata
Radiocarbon dating use carbon as its parent material to find the age of fossils, bones, and wood that are up to how old?
50 000 years
For the first billion years of earth’s history, how much fossil evidence was there?
Very little
What is bitumen?
A heavy, almost solid form of petroleum
What is Oil formed from?
Animal & plant remains
What do relative, radiometric, and radiocarbon dating provide information about?
The age of strata
Why doesn’t fossil evidence exist for all living organisms?
The conditions to form a fossil are very specific
Are radiometric in radiocarbon dating both examples of absolute dating?
Yes
What are three ways that oil and natural gas can be trapped?
Thrust fault, normal fault, reef
What is each particle of oil sand coated with?
A layer of water and a film of bitumen
On the geologic time scale, is Cambrian a period?
Yes
What type of fossil occurs when an organism is buried under many layers, causing sediment, pressure, and heat to build up and leave a thin film of carbon residue on rock surfaces?
Carbonaceous film
