Relative dating of geological strata

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 same inductive mechanism is applied in archaeology, geology and paleontology, by many ways.

Fossils are used to determine the order and dates of the strata in which they are found.

Principles of Stratigraphy Stratigraphy is the study of strata (sedimentary layers) in the Earth's crust.

Geologist in the 1800s worked out 7 basic principles of stratigraphy that allowed them, and now us, to work out the relative ages of rocks.

Relative dating methods are unable to determine the absolute age of an object or event, but can determine the impossibility of a particular event happening before or after another event of which the absolute date is well known.

In this relative dating method, Latin terms ante quem and post quem are usually used to indicate both the oldest and the most recent possible moments when an event occurred or an artifact was left in a stratum.Paul is super awesome, so I'm going to take him at his word.But really, how do scientists figure out how old their dinosaur bones are?A subaerial unconformity is a surface formed through subaerial exposure and erosion, and includes features formed by downcutting rivers, soil processes, and karst processes.In addition, every depositional sequence is the record of one cycle of relative sea level.are deposited in a time sequence, with the oldest on the bottom and the youngest on the top." This is just as newspapers found in accumulated trash tends to be older on the bottom than they are on the top.

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