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COVERT- BIO HISTORY

COVERT Fossils and Geologic Time Eras

TermDefinition
Petrified Remains Fossil Permineralized remains of a once living organism
Mold and Cast Fossil An empty space where a once living organism dissolved away, filled by sediment forming a copy
Carbon Film Fossil A silhouette or shadowy film of carbon left where an organism decayed away
Trace Fossil Evidence of the activities of once living organisms
Preserved (or) Original Whole organisms mostly intact with soft tissue remains, bones, skin, and hair, etc.
Mineral Replacement (permineralization) fossil preservation Tiny spaces within hard parts of organisms decay away and are filled with mineral traces from evaporated water
Carbon film fossil preservation Carbon compounds remain after an organism decays leaving a film or silhouette of the once living organism
Coal fossilization Large amounts of decayed plant material accumulated over time, carbonized deposits.
Molds and Casts Impressions of once living organisms which leave an empty mold filled by watery sediment creating a cast copy
Original Remains or Preserved Remains fossilization Conditions must allow soft parts to remain in organisms once living, who are suddenly buried or trapped in tar, amber or ice
Tracks Trace Fossilization Activities of organisms are recorded in many ways including fossilized tracks, or excrement (coprolite)
Trails and Burrows Tracks Fossilization Activities of organisms movements through clay or sediment become petrified spaces of where the organism lived or traveled, ex. marine, freshwater, worms or insect organisms
Paleozoic An Era in which first fish, plants, amphibians, reptiles, trees, and ferns were prevelant. ~ 540-251 mya
Mesozoic An Era in which first mammals, dinosaurs, birds, primates and flowering plants were prevelant ~ 250 - 65 mya
Cenozoic An Era in which mammals diversify, humans change over time to modern day humans with appearance of more complex life forms.
Created by: MrsCovert
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