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fossils
evidence or remains of an organism
i.e. mineralised bones, teeth and shells, tissues
types of fossils
trace fossiles
moulds
casts
trace fossils
indirect evidence such as footprints, teeth marks, tracks, arrows and fossilised faeces
organisms are compressed under sedimentary rock, and their tissues decay but leave the imprint in the rock
organisms are compressed under sedimentary rock and their issues decay leaving an imprint. when another sediment fills in the mould a 3D fossil is made
sedimentary rock
made from layers and layers of sediment compressed together under water-sediment can be slit, sand, mud etc.
fossilisation
1) specimen needs to be quickly covered in sediment
2) decay needs to be prohibited
3) specimen needs to be left undisturbed for millions of years
relative age
age of a fossil organism, rock, or geologic feature or event defined relative to other organisms, rocks, or features or events rather than in terms of years.
index fossils
fossils used to define and identify geological periods
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