Relative dating block diagrams

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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.

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.

From top to bottom: Rounded tan domes of the Navajo Sandstone, layered red Kayenta Formation, cliff-forming, vertically jointed, red Wingate Sandstone, slope-forming, purplish Chinle Formation, layered, lighter-red Moenkopi Formation, and white, layered Cutler Formation sandstone.

• Rocks above unconformity are younger – rocks below older Bedrock outcrops A and B are located at two different locations along the Provo River.

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Relative dating does not provide actual numerical dates for the rocks.Superpositionyoungest to oldest GRAND CANYON- LAW OF SUPERPOSITION YOUNGEST ON TOP OLDEST ON BOTTOM • In the 17th C., Nicolas Steno made an important observation: "Sediments are usually deposited in horizontal layers." He called this “ORIGINAL HORIZONTALITY” The Principle of...• ORIGINAL HORIZONTALITY: Folds and tilts are younger than rocks themselves Folds/Tilts FOLDS - TILTS The Principle of...Fossils are important for working out the relative ages of sedimentary rocks.Throughout the history of life, different organisms have appeared, flourished and become extinct.

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