Generally when relatively dating strata or fossils in strata the oldest material will be below the newest material which means oldest on the bottom and newest on the top. Think of making a brick-wall, the first bricks to be put down are those on the bottom which makes them older than those at the top of the wall.

Which layer would have the oldest fossils according to relative dating?

Geologists follow three main simple rules in order to determine the relative age of rock layers. First and foremost, they use the law of superposition to determine the relative ages of sedimentary rock layers. According to the law of superposition, in horizontal sedimentary rock layers the oldest is at the bottom.

Where are older fossils usually found?

sedimentary rock Most fossils are found in sedimentary rock. Sedimentary rock is formed by dirt (sand, silt, or clay) and debris that settles to the bottom of an ocean or lake and compresses for such a long time that it becomes hard as a rock.

How can you tell how old fossils are and where are the oldest ones found?

To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.

How do you know if a rock has crystals in it?

If the rock feels lighter than that surrounding rocks, it may be a geode. Geodes have a hollow space inside, which is what allows the crystals to form. You can also shake the rock next to your ear to test whether it is hollow. You may hear small pieces of rock or crystal rattling around inside if it is hollow.