Relative dating images, learning goals

Description and Teaching Materials The Relative Dating Lecture prepares students to be able to rank the images in the Relative Dating Activity from youngest to oldest and how to apply this to the formation of seamounts and volcanic islands.

On a larger scale, even between continents, fossil evidence can help in correlating rock layers. I ate the sandwich.

The Grand Canyon and Relative Dating

The graptolite, placoderm, ammonite, ichthyosaur, and shark's tooth could possibly be used as index fossils since they are found in only one layer. List the rock layers in order from oldest to youngest. I spread a layer of jelly on another piece of bread. Technically, however, given only this set of strata, one cannot say that the shark's tooth and ichthyosaur could be used as index fossils because we do not know if they continue in younger rock layers above this set of strata.

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If you did it like many people, you based your sentences on what you know normally happens when you make a lunch. The fossils within rock layer OXD i. Included fragments[ edit ] The law of included fragments is a method of relative dating in geology.


There is no link back to this page and probably no need to return here, but if you want to revisit this page you can either click the Back button as many times as it takes to get here or close the program and start over. Faults are younger than the rocks they cut; accordingly, if a fault is found that penetrates some formations but not those on top of it, then the formations that were cut are older than the fault, and the ones that are not cut must be younger than the fault.

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The Law of Superposition, which states that in an undisturbed horizontal sequence of rocks, the oldest rock layers will be on the bottom, with successively younger rocks on top of these, helps geologists correlate rock layers around the world. If the letters "T" and "C" represent fossils in the oldest rock layer, they are the oldest fossils, or the first fossils formed in the past for this sequence of rock layers.

The black arrow points to one good example, but there are several others. Sequence the remaining cards by using the same process.

Context for Use

This shows how a beach sand can cover a huge area. As a result, xenoliths are older than the rock which contains them.

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I put the two pieces of bread together. Prepare students to make predictions of the relative age of volcanoes based on predictable progressions.

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Eastern Grand Canyon - An angular unconformity is where older rocks were tilted, eroded, and overlain by younger rock layers. In reading earth history, these layers would be "read" from bottom to top or oldest to most recent.

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As a result, rocks that are otherwise similar, but are now separated by a valley or other erosional feature, can be assumed to be originally continuous.

The formation of melt inclusions appears to be a normal part of the crystallization of minerals within magmas, and they can be found in both volcanic and plutonic rocks.

All of the fossils represented would be found in sedimentary rocks of marine origin.

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Number the pictures from one to five with one being the oldest and five being the youngest. This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional eventsand notable biological events appearance, relative abundance, or extinction of certain life forms.

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The following activity lets you be the geologist. Westchester dating events shows how different types of sediment can be deposited at the same time and how one type can be deposited over another type.

Where are they in the stack? Use your Back button to return to this page.

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Return to top To enhance this activity, have students match the fossil sketches to real fossils.