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Geologic Age Dating Explained

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Relative Dating of Geologic Cross-Sections: Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology relative dating drawings is often hidden from view. Cliffs and road cuts are "side views" or "geologic cross-sections" of the topography which show the relative positions of various rock layers and structures at a given spot.

Name: Date: Relative Time Practical. RELATIVE DATING WORKSHEET Draw the sequence and label the layers (A, B, C, D) – A being the bottom layer. Chapter Age Dating Rocks and Fossils. 2 Model the principles of relative age dating below (draw and describe) Look at page – Science Book.

Applying the principles of relative dating to these rock exposures also called "outcrops"we can reconstruct the sequence of events that created the geologic features which we see. Events can be the deposition of a sedimentary layer, the eruption of a lava flow, the intrusion of magma to form a batholith, a fault break in the relative dating drawings that shifts one relative dating drawings relative to the other side and causes an earthquakea fold that bends and distorts rock layers, or any number of other geologic processes.

Just as Sherlock Holmes used his power of observation to decipher the clues to a suspect's past actions, we will let the blemishes and behaviors of the rocks tell us their past story. Am I getting too carried away here? Remember that relative dating involves determining "which came first" rather than "exactly when did this happen.

Relative dating drawings: five principles of relative age dating defined, and the law of inclusions

To drawing our principles of relative dating dating as applied to such geologic cross-sections, we will make use of a neat learning tool available on the Internet. Click to access the activities related to the interpretation of geologic sequences.

Practice each several times till you get them correct. What principle s of relative dating did you use in order to arrive at your interpretation of the relative timing of each event? The various sedimentary layers are labeled as B, E, K and W.

Relative dating drawing

The timing of the fault break in the rocks labeled as Q must be included in the sequence of events. The two intrusions are labeled as X and Z; the surrounding rock called the "country rock" is labeled as D.

Reconstructing a Regional Geologic Story: We have seen that a cliff or a road cut is a local "geologic cross-section" -- a side view of the geology at one location.

As geologists piece together the information at relative dating drawings outcrops, they can begin to assemble a "geologic map" like a road map of an entire region consisting of many square miles. This map displays the large-scale also called "regional" geologic features they have inferred are present beneath the landscape.

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Along with these geologic maps, we can reconstruct a regional geologic cross-section which would be like a great "geologic slice" through the landscape. In the next lab, we will learn how to use local geologic information from outcrops to begin to build such regional geologic maps and geologic cross-sections, but for now we just want to practice how to read them. Remember when we drew a topographic profile for lab manual exercise 1 page 18 on Topographic Maps?

We could draw relative dating drawings a profile across several miles of landscape so we would see a side-view of the land's surface over which we might be hiking. For example, we could use a ruler to draw a straight line a "transect" from the northwest corner to the southeast corner of the topographic map in our lab kit; then we could draw in the topographic profile along this link by using the contour line information on the map as done on page In the same way, such a transect could also show the inferred profile of the geology underfoot -- the expected rock layers and structures beneath the land from the northwest corner to the southeast corner.

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Takus

09.10.2018 at 11:41

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