10Law of Superposition The youngest rocks are on the top. The oldest rocks are on the bottom.
11Principle of Superposition Q#1Which rocks are older?Which rocks are younger?Younger RocksOlder Rocks
12Principle of Cross-Cutting Fault is a break or cut in the rock.You can't cut something until that something exists, therefore the cut has to be younger.So faults are younger than the rock it cuts through.Volcanic vents cutting acrosssedimentary rock layers -Which is youngest?
13Principle of Cross-Cutting Q#2What is younger?The rocks or the fault line?
23Which is younger? The fault or the rock layers? Q#7FAULTHow doyou know?
24Which is younger? The rock layer or the inclusion? Q#8Howdoyouknow?inclusion
25Using Fossils to Date Rocks Give relative age to a layer of rockMatch layers of rock at other locationsUse index fossils to match rock layersIndex fossils are distributed in different areas & only occur in one areaEx. pg. 117