Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
9 Cards in this Set
- Front
- Back
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 |
|
moulds |
organisms are compressed under sedimentary rock, and their tissues decay but leave the imprint in the rock |
|
casts |
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 |