This is because while different types of rock strata were formed during different times, the times may not have been far part. This means that during those time periods, the same organisms lived in that particular area.
no, it dosent really matter, they are found in a global spread
== NO a fossil must be found but scientists can probably guess about how old the mountain is by looking at it and fing== ding out the types of rock that it has. ===
Because if you know how old the fossil is, and you find the fossil inside a rock, you know that rock has a maxium age corresponding with the age of the fossil.
sedimentary rock
The best way to identify fossils is to get a book or website that shows pictures of different types. Most fossils are formed by petrification, where part of the dead organism has slowly changed into rock. However, you might also find a fossil cast, where rock has formed around a dead organism and left a mold; it can either be a hollow space, or more rock may have filled in the shape of the organism. There are even fossil footprints and fossil poo!
A fossil bed or fossil site contains many different types of fossils. These can include remains of plants, animals, and other organisms that have been preserved in sedimentary rocks over millions of years.
because it hiding in the records of the rock
you can find rock types in caves or in victory road.
succeed one another in a definite order
Shale sometimes holds fossils. =]
sedimentary because it is the ONLY rock that can contain fossils.
A fossil used to date surrounding rock layers is called a index fossil. Index fossils are particularly useful for determining the relative ages of rock layers in different locations.