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Which statement best explains why rock layer 3 is missing from outcrop B? (2) Erosion created an unconformity between rock layers 2 and 4 in outcrop B. Unconformities are usually shown in block diagrams with a wavy line to represent the buried eroded surface interface between layers Upper Silurian Carbonates Tilted Ordovician Shales and Sandstones unconformity Taconic Unconformity Applying Principles of Relative Dating to Determine Geologic History of an Area • The process of matching rocks or geologic events occurring at different locations of the same age is called CORRELATION Correlation of rock layers often relies upon fossils • William Smith (late l700’s) noted that rock layers in widely separated areas could be identified and correlated by their distinctive fossil content • This led to the "principle of faunal succession“ • Fossils succeed one another in a definite and determinable order, and therefore any time period can be recognized by its fossil content Eurypterus Silurian index fossil Index Fossils Index fossils - any animal or plant that is characteristic of a particular span of geologic time or environment.

Two ways to tell time with rocks: • RELATIVE DATING: order or sequence known, but not the actual date of occurrence.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.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.

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These strata make up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park.

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