isopach
/ˈaɪsəˌpæk/
noun
- A line on a map connecting points of equal thickness of a particular rock layer or geological formation.
- By studying isopachs, scientists can understand how a rock formation was deposited over time.
- The isopach lines revealed that the sediment was thickest near the ancient river delta.
- Geologists drew an isopach map to show the varying thickness of the sandstone layer.