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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 Grand Canyon acts as a modern testament to stratigraphy and relative dating.
When geologists study layers of rocks, they get a glimpse of the past.
Determining the precise way that sedimentary rocks have layered throughout time gives them insight into how natural events have occurred.
This aspect of Werner's model was useful for explaining the origin of tilted sedimentary rocks.
(dark brown) Flat lying sedimentary rocks were eventually precipitated.