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Admin12.08.2021

Lab

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63010
Admin21.07.2021

7.1: Relative Dating

Lab Procedures There are three parts of this lab: working with a simplified geologic map to better understand mappable rock units and mappable sediment units that cover up the rocks; interpreting geologic structures on cross-sections, block diagrams, and simplified geologic maps; and working with simplified cross-sections based on real geologic maps.
6804
Admin17.09.2021

7.1: Relative Dating

When sea-level fell, the land was exposed to erosion creating an unconformity.
9503
Admin28.07.2021

7.1: Relative Dating

The predominant white layer just below the canyon rim is the Coconino Sandstone.
6307
Admin27.06.2021

7.1: Relative Dating

However, near the bottom horizontal strata overlie tilted strata.
3206
Admin18.08.2021

Lab

In the Grand Canyon cross-section, this erosion is shown as heavy wavy lines between the various numbered strata.
4700
Admin26.08.2021

Lab

Apply principles of relative geologic age.
4001
Admin19.08.2021

7.1: Relative Dating

Reread the section on the Geologic Time Basics page that covers.
36010
Admin22.07.2021

Lab

This unconformity was actually an ancient landscape surface on which sedimentary rock C was subsequently deposited perhaps by a marine transgression.
8100
Admin14.08.2021

Lab

Cross-sections seeing beneath the map To take a real-world look at geologic structures and how they appear on geologic maps, we will use the geologic map of Washington State published by the Washington State Department of Natural Resources.
3201
Admin30.08.2021

Lab

Later, horizontal strata were deposited on top of the tilted strata creating an angular unconformity.
7506
Admin26.08.2021

7.1: Relative Dating

Advance Preparation and Materials Needed• This layer is laterally continuous, even though the intervening canyon separates its outcrops.
6603