Question

Which of the following is the fundamental unit in the lithostratigraphy ?

• A. Member
• B. Bed
• C. Formation
• D. Group

Answer 1

Answer:

C. Formation

• Formation: This is the formal, fundamental unit of lithostratigraphic (the study of rock layers or strata) classification used to name and map rock layers.

• Hierarchy: Lithostratigraphic units are organized in the following order from largest to smallest:

  • Supergroup (Consists of multiple groups)

  • Group (Consists of two or more related formations)

  • Formation (Fundamental Unit)

  • Member (A distinct subunit within a formation)

  • Bed (The smallest formal unit, representing a distinct individual layer)