GenBio 2

• permineralization

  the process of filling up the spaces an organism has with groundwater
• carbonization


  organism leave behind residual carbon and shed other elements
• replacement


  the replacement of other minerals to the minerals of an organism
• mold fossils


  minerals and sediments press over the body of a dead organism
• cast fossil


  sediments and minerals fill up the body cavities of an organism
• trace fossil


  traces left behind by fossils in the past
• relative dating


  estimating of sequence of events through statigraphy
• absolute dating


  numerical estimate of the age of rock layers and fossils
• index fossil


  gives information about time a certain fossil was alive to be compared with other fossils
• true form fossils


  when plants or animals got stuck in ice, sap, tree or tar for years, keeping their original features intact