Step 1: Understanding the Concept:
This question asks for the correct chronological sequence of the four major glacial periods of the Pleistocene epoch as established for the European Alps. This classic sequence was proposed by Albrecht Penck and Eduard Brückner.
Step 2: Detailed Explanation:
The four major Alpine glacial stages are named after rivers in southern Germany. The correct order from oldest to most recent is:
1. Günz glacial stage (oldest)
2. Mindel glacial stage
3. Riss glacial stage
4. Würm glacial stage (most recent, corresponding to the last ice age)
Step 3: Final Answer:
Matching the names to the letters provided:
- B. Günz
- D. Mindel
- A. Riss
- C. Würm
The correct chronological sequence is B, D, A, C.