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Fossils

QuestionAnswer
fossil preserved traces/ remains of animals or plants from the past
sedimentary rocks layered rocks where fossils are regularly found
ammonites a group of extinct marine mollusk animals
stromatolites Rock like structures built by blue-green algae.
trace fossil a type of fossil, Provides indirect evidence of life in the past rather than the body of the animal itself.
index fossil indicate to geologists the boundaries in geological time. age of rocks
casts organism dies and is replaced with minerals (sand and clay)
molds organism dies and the cavity is NOT filled
relative age the older a fossil is, the deeper in the earth it is
absolute age Uses the decay of radioactive elements to find the absolute age of a rock or fossil
geologic time scale tells us when organisms lived and how they changed also gives clues to the environment
fossil record By using relative and absolute dating scientists are able to put together the Earth’s geologic history.
coprolite fossilized feces
petrification a type of fossil, organic matter turns into a rock
law of superposition newest rock layers are on top of old ones unless a disturbance occurs
paleontologist someone who studies fossils
fossil resin a type of fossil (amber), everything is preserved, even DNA
tar and ice a type of fossil, animals get trapped and are preserved , sometimes even with organs and skin intact
how replacement happens water dissolves original material and replaces it with mineral matter
how permineralization happens groundwater carries dissolved minerals into the pores and cavities of bone, wood, or shells
how carbonization happens all substances of plants and animals decay, except carbon. This leaves a carbon film on the sedimentary rock.
how are faults related to the layers they cut through they are younger
how old are the oldest known animal fossils 700 million years old
Created by: akonz
 

 



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