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Sediments were deposited in continuous sheets that spanned the body of water that they were deposited in.When a valley cuts through sedimentary layers, it can be assumed that the rocks on either side of the valley were originally continuous.

He then sought to explain how fossil seashells could be found in rocks far from any ocean.

Geologists use several principles to find the relative age of geologic layers. Remember, contact metamorphism is changes in a rock due to contact with magma or lava.

- The principle of superposition is simply the fact that the lowest layer of a rock formation is the oldest layer while the youngest layer is towards the top. Think of it as a boundary layer between igneous rocks and sedimentary rocks.

The Grand Canyon provides an excellent illustration of Steno's laws.

Figure 11.13 shows the many horizontal layers of sedimentary rock that make up the canyon.


  1. Components there are to the edible rock. As they are drawing the. “rock” encourage the students to be thinking about which layers or features may have formed first. Remind them that some of the concepts on the relative age dating worksheet will help them to determine which layers came first. It is also important to let the.

  2. Of lakes, rivers, and seas. Over time, the sediments pile up to form horizontal layers of sedimentary rocks. The bottom layer of rock forms first, which means it is oldest. Each layer above that is younger, and the top layer is youngest of all. This ordering is relative because you cannot be sure exactly when each layer formed.

  3. Jun 24, 2016. This interactive asks you to use your knowledge of relative dating. You need to work out the order in which rocks were formed, from youngest to oldest. You will need the Adobe Flash Player to view this. Transcript. Welcome. We've found this cliff. Help us work out the relative ages of the layers of.

  4. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actual ages of certain types of rock to be calculated. Relative Dating. Fossils are found in sedimentary rocks that formed when eroded sediments piled up in low-lying.

  5. RELATIVE DATING OF GEOLOGIC MATERIALS. volcanic without any fossilsthis rock contains pores and groovesit formed over a longer period of erosion. S Horizontal layers. d. Have a student add a third spoonful of sand to the cylinder. T Which of the sand layers was deposited first which is the oldest.

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