ASBOG Practice Exam

What do geologists use the terms type locality and type section to describe?

1. The age of rock layers

2. Locations of geological formations

3. Physical properties of minerals

4. Depths of sedimentary beds

The correct answer is: Locations of geological formations

Geologists use the terms type locality and type section to describe specific locations where particular geological formations or rock types are first identified and thoroughly documented. The type locality is the geographic area where a rock, mineral, or other geological feature is first discovered or named, serving as the standard against which other discoveries of that formation can be compared. Similarly, the type section is a specific stratigraphic section within that locality that provides a detailed description of the thickness and characteristics of the rock layers. These terms are essential in geology because they help provide a clear reference point for scientists studying the distribution and formation of rock strata, enabling effective communication and consistency across research and geological mapping. This context is crucial for understanding the geological history of an area and for making comparisons with similar formations elsewhere. The other choices focus on aspects such as age, physical properties, or depths of rock layers, which are related to geological studies but not directly defined by the terms type locality and type section. Hence, the focus on locations of geological formations aligns with the defined purpose of these terms.