Published on: Mar 4, 2016
Transcripts - Preserved parts1
FossilPreservationPetrified Wood, Amber, Ice, andTarHow Fossils areFormed
Petrified WoodWood turned into stoneFrom trees that existed over 225 millionyears ago.Trees are covered with sandand mud. Water seeps in.When wood dries mineralssoak into the wood andreplace the wood with stone.
Petrified Wood Colors of the wood depend on minerals thatseeped in. Colors of petrified wood includeyellow, black, red, white, black and sometimesblue. Often used in furniture making.
Amber Natural Tree Resin (like sap from a tree) Contains whole parts of insects Internal organs are preserved Preserve the animal so well that scientistscan get DNA samples from them (RememberJurassic Park?)
Amber Most amber found today was formed about30 – 50 million years ago Formed because trees try to defendthemselves Yellowish to dark blue
Ice The best way to preserve ancientmaterials. Happens very rarely Must be continually frozen from death towhen it is discovered. Some that have been found: WoolyMammoth andWooly Rhinoceros.
Ice Animals with flesh, skin, and hairintact have been found. Some of these finds suggest thatthey were flash frozen, with food stillin the mouth and stomach.
Tar Pits Most common tar pits are the Le Brea tar pits insouthern California. Millions of years ago, Los Angeles was underwater. Marine life settled to the bottom ofthe ocean floor Remains turned into fossil fuels(gas, coal, and petroleum)
Tar Pits Petroleum evaporated and left tar What was left was asphalt (the black materialthat roads are made out of): very sticky in warmweather. Animals became trapped—90% werecarnivores: Prey would become trapped and thepredator that went after themwould become trapped too.
http://www.ehow.com/facts_5799785_preserved_remains-fossil-formed_.html http://science.howstuffworks.com/environmental/earth/geology/fossil3.htm http://petrifiedwoodmuseum.org/SciOly.htm