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Rather than putting them into a photo album they are stacked up in a box. If a scientist finds one of those fossils they can then assume the age of the rock based on the age of the fossil.
Where are the oldest pictures, by year, going to be in your stack? Often igneous intrusions will cut across layers of rock.
When an organism dies, it stops incorporating carbon (all forms of carbon, including 14C) into its structure.
The amount of radioactive carbon (14C) that had been in the organism when it was alive begins to decrease at death as it loses nuclear particles through radioactive decay.
For example, archaeologists might date materials based upon relative depth of burial in a site.
The archaeologists record and analyze the changes in types and styles of human-made items from different levels according to the principle explained below.
The principle of cross-cutting relationships states that the intrusions are younger than the rock they cut.
Therefore, the igneous intrusion may be below a layer that is older than it.
All plants and animals incorporate carbon into their tissues during their lives for growth and energy.
Relative dating establishes the sequence of physical or cultural events in time.