Fossils in Rocks
Published on Dec 22, 2015
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PRESENTATION OUTLINE
MOLDS AND CASTS
- Most fossils that form in sedimentary rocks are molds and cast.
- An organism dies and falls into soft sediment over time.
- The sediments become rocks and the organism decay leaving a mold.
- Minerals fill the mold and makes a cast of organism.
PETRIFIED WOODS
WHEN PLANTS MATERIAL IS BURIED BY SEDIMENT AND PROTECTED FROM DECLAY BY OXYGEN AND ORGANISM.
CARBON FILMS
- usually form when sediment buries a dead organism as sediments piles up.
- The organisms remains are subjected to pressure heat .
TRACE FOSSILS
- Are not part of an animal or impressions of it.
- Trace fossils include preserved foot praints trails,animals holes and even feces.
PRESERVED FOSSILS
- when animals and plants die they typically decay completely.
- But sometimes when the conditions are just right ,they're preserved fossils.
MOLDS AND CASTS
EXAMPLES:EXAMPLES: FOSSIL SHELLS ARE OFTEN CASTS, AND SHELL IMPRESSIONS ON ROCK ARE OFTEN MOLDS. A FOSSILIZED FOOTPRINT IS A MOLD. PLANT FOSSILS AND TRILOBITES ARE OFTEN FOUND ...
PETRIFIED WOODS
EXAMPLES:THE MOST NOTABLE EXAMPLE IS THE PETRIFIED FOREST IN ARIZONA.[3]
CARBON FILMS
EXAMPLES:ARE MOLECULES, BUT THE BONES OF A DEAD MOLECULE. ... THE CARBON FILM CONSISTS OF PLASMA POLYMER FILMS, AMORPHOUS CARBON FILMS, AND ...
TRACE FOSSILS
EXAMPLES: BURROWS, BORINGS (BIOEROSION), UROLITES (EROSION CAUSED BY EVACUATION OF LIQUID WASTES), FOOTPRINTS AND FEEDING MARKS, AND ROOT CAVITIES.
PRESERVED FOSSILS
EXAMPLES:THE TERM ALSO IS USED TO DESCRIBE THE FOSSIL FUELS READ MORE: HTTP://WWW.SCIENCECLARIFIED.COM/EX-GA/FOSSIL-AND-FOSSILIZATION.HTML#IXZZ3SZ...
