Relative dating block diagrams
Correlation can involve matching an undated rock with a dated one at another location.
Suppose you find a fossil at one place that cannot be dated using absolute methods.
For example, microscopic dinoflagellates have been studied and dated in great detail around the world.
Correlation with them has helped geologists date many New Zealand rocks, including those containing dinosaurs.
Pre-existing rock will undergo CONTACT METAMORPHISM b. Erosion – layers that get cut are older than the erosion Igneous Intrusion - Cross Cutting Cross Cutting CROSS-CUTTING The Principle of...
• INCLUSIONS: pieces of rock found IN another rock must be OLDER (formed first) than the rock that they are in.
Bring relative dating principles to life with the activity Rock layers and relative dating.
Students begin by observing a photograph and a diagram of rock layers near Whanganui, watch an animation about how the layers were formed, then use an interactive labelling diagram to work out the order in which the rocks were created.
Geologists have studied the order in which fossils appeared and disappeared through time and rocks. Fossils can help to match rocks of the same age, even when you find those rocks a long way apart.
Included Fragments Included Fragments Unconformities – Buried Eroded Surfaces • Sometimes layers of rock are missing • There is a break or gap of geologic time not represented by the layers in an area.