Fossils Flashcards
the remains or imprints or traces of prehistoric organisms
Fossils
the preserved remains or evidence of ancient living things
Fossils
the spaces within the bone or wood have been replaced by minerals from the groundwater or river water flowing through them
Mineral Replacement or Permineralization
When the organism was squeezed in heated until only the carbon remains were left in rock layers
Carbon films
Impression/cavity in rock
Mold
When sediments fill in a mold
Cast
Original soft parts of an organism remain in items such as Amber
Preserved remains
Tracks burrows and trails showing the activity of the organism remains
Trace fossil
The type of rock most fossils are found in
Sedimentary
What type of rock preserves fossils the best? We model it using clay.
Shale
Organisms that only appeared in fossils during a limited amount of time, easily showing us which time period they were from
Index Fossils
Suggests that the oldest fossils are at the bottom and the youngest fossils are at the top
Relative Dating
In undisturbed layers the oldest fossils are at the bottom
Law of superposition
People in Canada found creepy organisms in this type of rock
Burgess Shale
The word for the matching of rock layers
Correlation
