EVIDENCE OF ANCIENT WILDFIRES PRESERVED IN COAL REVEALS CLUES TO EARTH’S CLIMATE

1. At a Glance

• Molecular evidence of massive wildfires (palaeofires) that swept across Gondwana forests ~250 million years ago (Permian), reconstructed from Indian coal-bearing sediments [S1].
• Work done by Birbal Sahni Institute of Palaeosciences (BSIP), Lucknow — an autonomous body of DST, Ministry of Science & Technology — using palynofacies + Raman + FTIR spectroscopy on Godavari Valley Coalfield samples [S1][S3].
• Relevance: links palaeoclimate, coal-forming environments and extreme fire events, feeding into models for future climate change and ecosystem response [S1].

2. Why in the News

• 25 May 2026 PIB release announced BSIP team's findings (Aggarwal, Srivastava, Mathews) published in Geological Journal (Wiley) distinguishing high-intensity (h-PAL-CH) vs low-intensity (l-PAL-CH) palaeofire-derived microcharcoal in Godavari Valley Coalfield [S1].
• Builds on the 2025 BSIP study in ACS Omega (Godavari Basin shales) that used Raman, Rock-Eval Pyrolysis and FTIR to separate in situ vs ex situ charcoal [S2][S3].

3. Background & Evolution

• Macrocharcoal in Indian Permian sediments first hinted at large-scale palaeofires; Raniganj Coalfield was among the earliest Indian sites where fossil charcoal was identified [S1][S3].
• Earlier palaeofire work relied largely on microscopic observation — ambiguous in telling OX-CH (oxidised opaque phytoclasts) apart from PAL-CH (fire-induced opaque phytoclasts) [S1].
• BSIP filled this gap by integrating palynofacies analysis with Raman & FTIR spectroscopy, bridging visual identification with geochemical characterisation [S1].
• High atmospheric oxygen levels during the Permian are believed to have intensified such fires [S3].

4. Core Static Facts

• Lead institute: Birbal Sahni Institute of Palaeosciences (BSIP), Lucknow [S1][S4].
• Parent: Department of Science and Technology (DST), Ministry of Science & Technology [S1][S4].
• Founded: 1946 by Prof. Birbal Sahni as Institute of Palaeobotany; autonomous under DST since 1969; mandate broadened in 2017 and renamed Institute of Palaeosciences [S4].
• Study site: Godavari Valley Coalfield (Pranhita-Godavari Gondwana basin) [S1].
• Age: Permian, ~250 million years before present [S1].
• Researchers: Neha Aggarwal, Shivalee Srivastava, Runcie Paul Mathews [S1].
• Techniques: Palynofacies analysis; Raman spectroscopy (detects PAH structural ordering); FTIR spectroscopy (functional groups of thermal alteration); Rock-Eval Pyrolysis (earlier study) [S1][S3].
• Key new categories: h-PAL-CH (high-intensity fire charcoal) and l-PAL-CH (low-intensity fire charcoal); distinguished from OX-CH (oxidised opaque phytoclasts) [S1].
• Journals: Geological Journal, Wiley (2026); ACS Omega (2025) [S1][S3].
• Gondwana System (India): glacial-derived Talchir Formation to coal-bearing Barakar Formation, recording shift from Permo-Carboniferous glaciation to humid warm climate [S5].

5. Multi-Dimensional Analysis

Scientific / Technological - First multi-proxy molecular Indian palaeofire framework — combines optical palynofacies with Raman second-order spectral features indicating polycyclic aromatic hydrocarbons (PAHs) typical of combustion residues [S1]. - Resolves longstanding ambiguity between oxidised and fire-derived opaque phytoclasts, enabling high-resolution fire reconstructions [S1].

Environmental / Climate - Permian palaeofires shaped vegetation, atmospheric O₂/CO₂ and coal-forming peat ecosystems of Gondwana [S1]. - Reconstructions feed long-term climate models; analogues for behaviour of modern ecosystems under intensifying wildfire regimes [S1].

Historical / Geological - Reinforces India's position within Gondwana supercontinent record; Indian Gondwana coal measures (Barakar etc.) host nearly all the country's coal reserves [S5]. - Stratigraphic control: regressive (sea-level fall) phases preserve cleaner in-situ fire signatures; transgressive phases yield mixed, oxidised charcoal [S3].

Administrative / Governance - Demonstrates output of an autonomous DST institute; aligns with India's deep-time science capacity-building (palaeosciences expansion of BSIP mandate, 2017) [S4].

6. Recent Developments

• 25 May 2026: PIB release announces Geological Journal (Wiley) paper distinguishing h-PAL-CH and l-PAL-CH microcharcoal in Godavari Valley Coalfield [S1].
• 2025: Earlier BSIP paper in ACS Omega (DOI 10.1021/acsomega.4c08281) on in-situ vs ex-situ charcoal using Raman, FTIR and Rock-Eval Pyrolysis [S3].
• Continues BSIP's broader palaeofire chronicle of Permian India programme [S2][S3].

7. Prelims Hooks

• BSIP, Lucknow is an autonomous institute under DST, NOT under MoEFCC or Ministry of Coal [S1][S4].
• Founded by Prof. Birbal Sahni in 1946; autonomous since 1969; renamed Institute of Palaeosciences in 2017 [S4].
• Study geography: Godavari Valley Coalfield (Pranhita-Godavari Gondwana basin) [S1].
• Time frame referenced: Permian, ~250 million years ago [S1].
• Techniques used: palynofacies analysis, Raman spectroscopy, FTIR spectroscopy (Rock-Eval Pyrolysis in earlier study) [S1][S3].
• OX-CH = oxidised opaque phytoclasts; PAL-CH = fire-induced opaque phytoclasts [S1].
• New classes introduced: h-PAL-CH (high-intensity) and l-PAL-CH (low-intensity) palaeofire microcharcoal [S1].
• Raman second-order peaks indicate Polycyclic Aromatic Hydrocarbons (PAHs) — combustion marker [S1].
• Published in Geological Journal (Wiley) in 2026 [S1].
• Raniganj Coalfield was the early Indian site for fossil charcoal identification [S3].
• Indian Gondwana sequence: Talchir (glacial) → Barakar (coal-bearing humid) [S5].
• High atmospheric oxygen in the Permian intensified wildfires [S3].

8. Mains Relevance

• GS-III: Science & Technology (indigenous R&D, geosciences); Environment (climate change, palaeoclimate analogues).
• Syllabus headings: Awareness in the fields of Science & Technology; Conservation, environmental pollution and degradation, climate change.
• Possible stems: 1. "Deep-time records preserved in Indian Gondwana coalfields offer critical analogues for contemporary climate change. Discuss." (GS-III) 2. "Evaluate the role of autonomous DST institutes such as BSIP in advancing India's palaeoscience research." (GS-III) 3. "How can molecular palaeofire reconstructions inform present-day wildfire and ecosystem management policy?" (GS-III)

9. Related Topics to Study Next

• Gondwana Supercontinent & Indian Gondwana coalfields — geological basis of India's coal reserves [S5].
• Permian–Triassic mass extinction — same ~250 Mya window as the study.
• Birbal Sahni & Indian palaeobotany — biographical/institutional history [S4].
• DST autonomous institutions (Wadia, IIA, ARIES, BSIP) — S&T governance.
• Coal geology of India — Damodar Valley, Son-Mahanadi, Pranhita-Godavari basins.
• Wildfire trends & climate change — current MoEFCC/FSI forest-fire monitoring.
• Raman & FTIR spectroscopy applications — Prelims-style science questions.
• Talchir vs Barakar Formation — stratigraphy [S5].

10. Common Errors / Trap Areas

• BSIP is under DST, not Ministry of Coal or MoEFCC [S1].
• BSIP was renamed (Palaeobotany → Palaeosciences) in 2017; older texts still say "Palaeobotany" [S4].
• Study basin is Godavari Valley Coalfield (Gondwana), not the Krishna-Godavari (KG) hydrocarbon offshore basin.
• Permian palaeofires are ~250 Mya, not Carboniferous; do not confuse with Carboniferous coal of Europe/North America.
• OX-CH ≠ PAL-CH: oxidation-derived vs fire-derived opaque phytoclasts [S1].
• The 2026 paper is in Geological Journal (Wiley) — distinct from the ACS Omega 2025 paper by the same lab [S1][S3].

11. Sources

• [S1] Evidence of Ancient Wildfires Preserved in Coal Reveals Clues to Earth's Climate — https://www.pib.gov.in/PressReleasePage.aspx?PRID=2264978 — (tier: 1)
• [S2] Echoes of Ancient Flames: Unraveling the Fire Chronicles of Permian India (PIB) — https://www.pib.gov.in/PressReleaseIframePage.aspx?PRID=2127307 — (tier: 1)
• [S3] Echoes of Ancient Flames: Unraveling the Fire Chronicles of Permian India (DST) — https://dst.gov.in/echoes-ancient-flames-unraveling-fire-chronicles-permian-india — (tier: 1)
• [S4] Birbal Sahni Institute of Palaeobotany, Lucknow (DST autonomous institutions page) — https://dst.gov.in/autonomousstinstitutions/birbal-sahni-institute-palaeobotany-lucknow — (tier: 1)
• [S5] Gondwana System — geological region, India — https://www.britannica.com/topic/Gondwana-System — (tier: 3)