Chapter 12: Problem 3

How does the principle of fossil succession allow determination of relative ages?

Short Answer

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The principle of fossil succession allows the determination of relative ages by examining the appearance and disappearance of fossil species in Earth's geologic strata in a consistent, sequential order. By identifying and comparing the unique sets of fossils in different rock layers, we can establish a progression of species, determine their relative ages, and construct a geological timescale representing the time periods they belong to. This method enables us to better understand Earth's history and the relative age of different geological formations.

Step by step solution

Understand the principle of fossil succession

The principle of fossil succession states that the appearance and disappearance of particular fossil species in Earth's geologic strata occur in a consistent, sequential order. By identifying and comparing fossil species found in different rock layers, we can determine the relative age of the layers based on the progression of species.

Identify the specific fossils in the rock layers

To determine the relative ages of rock layers, first, identify the different types of fossils present in each layer. These may include plants, animals, or microscopic organisms. Note any differences in the types of species found in each layer. The unique sets of fossils in each layer will help differentiate the various time periods they represent.

Compare the fossils in different rock layers

Next, compare the fossils found in each of the rock layers. The specific order in which fossils appear and disappear can help establish a sequence of time periods. Look for any similarities and differences between the fossil species in each layer to identify a progression of species.

Determine the relative age of each rock layer

Using the progression of species identified in Step 3, determine the relative age of each rock layer. The layer containing the oldest fossils will be considered the oldest rock layer, while the layer containing the youngest fossils will be considered the youngest rock layer.

Construct a geological timescale

Finally, construct a geological timescale representing the relative ages of the rock layers based on the identified fossils. The timescale will feature the different fossil species and the time periods they represent, allowing a visualization of the progression of species and relative ages of rock layers. This timescale can be referred to when examining new rock formations or fossil discoveries to better understand Earth's history and the relative age of different geological formations.

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How does the principle of fossil succession allow determination of relative ages?

Short Answer

Step by step solution

Understand the principle of fossil succession

Identify the specific fossils in the rock layers

Compare the fossils in different rock layers

Determine the relative age of each rock layer

Construct a geological timescale

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