RD Flashcards
Remains in organisms are found in rocks are
Fossils
____ are cavities left in rocks when a shell or bone decays
Molds
What are trace fossils and give some examples
No part of the actual organism just signs that it was there; trails, footprints, coprolites, gastroliths, etc
What are original remains (preserved) and give some examples
The actual organism preserved in ice, tar, amber, or caves; insects in amber , iceman ice mummy, frozen wooly mammoths, etc
When a cavity in a rock fills in with new material, the copy made is a _____
Cast
The process where a carbon imprint is pressed out into the rock is called
Carbonization
When wood or a dinosaur bones organic matter is replaced by minerals, we have a ______ fossil
Petrified
When a seashell is found on a mountain top, we know that the mountain top was once what?
Under water
A scientist who studies fossils to learn about organisms that lived long ago
Paleontologist
A well tested concept that explains a wide range of observations
Scientific theory
The preserved remains or traces of living things
Fossils
Describes a type of organism that no longer exists anywhere on earth
Extinct
A fault can be used to find the ____ age of groups of rocks
Relative
The law of superposition states that in layers of un disturbed sedimentary rocks, the oldest rocks are ______ _____ ____ and the youngest rocks are _____ _____ ______
On the bottom
on the top
Gals in rock layers are called
Unconformities
Relative dating can tell geologists
The order of events
When horizontal rock layers form over tilted layers, we call this
Unconformity (angular)
The statement that young rock layers are on the top of layers of un disturbed rock is called
The law of superposition
Geologists can use ____ to determine similarities in rock layers that are located in different places
Fossils
When rock layers are uplifted and eroded by water, we call this
Unconformity
