Relevance: GS Paper I – Geography (Geological Time Scale); GS Paper III – Environment & Climate
Source: The Hindu, International Commission on Stratigraphy (ICS)
Scientists classify the present period of Earth’s history as the Meghalayan Age, the most recent phase of the Holocene Epoch, marked by a major global climatic event. This classification helps understand long-term climate patterns and their impact on human societies.
What Is the Meghalayan Age?
The Meghalayan Age began 4,200 years ago, following a prolonged global mega-drought that disrupted agriculture and contributed to the decline of early civilisations.
Its defining evidence comes from oxygen isotope records in a stalagmite found in the Mawmluh Cave (Meghalaya)—the official Global Boundary Stratotype Section and Point (GSSP).
Geological Time Scale – Where Does Meghalayan Fit?
Earth’s history is divided into hierarchical units: Eon → Era → Period → Epoch → Age.
|
Level |
Example |
Current Status |
| Eon | Phanerozoic | Present |
| Era | Cenozoic | Present |
| Period | Quaternary | Present |
| Epoch | Holocene (11,700 years ago – now) | Present |
| Ages of Holocene | Greenlandian → Northgrippian → Meghalayan | Meghalayan spans last 4,200 years |
Why the Meghalayan Age Matters –
|
Aspect |
Key Points |
| Trigger Event | Abrupt global drought around 2200 BCE causing major monsoon weakening. |
| Primary Evidence (GSSP) | Oxygen-isotope record from Mawmluh Cave stalagmite (Meghalaya). |
| Civilisational Impact | Decline of Indus Valley, Egypt’s Old Kingdom, Mesopotamian societies, and Chinese Neolithic cultures; widespread crop failure, famine, migration. |
| Environmental Change | Drying of major regions, river shifts, reorganisation of settlements and early states. |
| Scientific Significance | Key to understanding Holocene climate variability and natural climate shocks. |
| UPSC Relevance | Links climate change, archaeology, monsoon studies; useful for comparing natural vs anthropogenic climate change. |
| Official Status | Recognised by the International Commission on Stratigraphy as the youngest Holocene age. |
UPSC Prelims Practice Question
Consider the following statements regarding the Meghalayan Age:
- It is the youngest subdivision of the Holocene Epoch.
- Its boundary is defined using stalagmite records from a cave in India.
- It began due to rapid warming that caused melting glaciers worldwide.
Which of the statements are correct?
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3
Answer: (a) 1 and 2 only
One-line Wrap:
The Meghalayan Age highlights how a major climate shock reshaped ancient civilisations—offering essential insights for understanding Earth’s climate past and future.
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