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Can relative dating always be used

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Relative Dating Superposition: The most basic concept used in relative dating is the law of superposition.

Simply stated, each bed in a sequence of sedimentary rocks (or layered volcanic rocks) is younger than the bed below it and older than the bed above it.

The goal of this lecture is come to come to a scientific understanding of geologic time and the age of the Earth.

In order to do so we will have to understand the following: To better understand these concepts, let's look at an archeological example: Imagine we are a group of archeologists studying two different trash pits recently discovered on the Tulane University campus and at the Audubon Zoo (where they all aksed for you).

The age of formations is marked on a geologic calendar known as the geologic time scale.

Development of the geologic time scale and dating of formations and rocks relies upon two fundamentally different ways of telling time: relative and absolute.

Relative-dating techniques are nearly always applicable but are not precise and require calibration.

Correlation techniques are locally useful and depend on recognition of an event whose age is known, such as a volcanic eruption or a paleomagnetic reversal.

This technique is widely used on recent artifacts, but educators and students alike should note that this technique will not work on older fossils (like those of the dinosaurs alleged to be millions of years old).From the beginning of this course, we have stated that the Earth is about 4.6 billion years old.How do we know this and how do we know the ages of other events in Earth history?By carefully digging, we have found that each trash pit shows a sequence of layers.Although the types of trash in each pit is quite variable, each layer has a distinctive kind of trash that distinguishes it from other layers in the pits.Geologic studies of active tectonism are greatly aided by definition and time calibration of local stratigraphic sequences.