How do stratigraphy and superposition help archeologists date layers in archeological sites? Objective Students will:1) Learn about the concept of superposition and 2) Apply superposition to understand the relationship between soil strata and the relative age of archeological artifacts. Background This lesson plan is one in a series that uses archeology to teach concepts everyone needs to know. It can be used as-is, or be customized with images, objects, or stories representative of a particular park or place. Lesson plans in this series are: What Is (and Isn’t) Archeology? Inference vs. Obser Duration: 60 Minutes.