Manash (Subhaditya Edusoft): The Devonian Period (419–359 million years ago) was known as the “Age of Fishes,”

The Devonian Period (419–359 million years ago) was known as the “Age of Fishes,” marked by diverse marine life, early forests, and the rise of amphibians. Near its end, the Devonian extinction wiped out about 70–80% of species, especially reef-building organisms and many marine groups, through a series of prolonged crises rather than a single event.

🌍 Devonian Period Overview

Timeframe: 419–359 million years ago.

Nickname: “Age of Fishes” due to the dominance of armored fish (placoderms), sharks, and lobe-finned fishes.

Marine Life: Coral-stromatoporoid reefs flourished; trilobites, ammonoids, and brachiopods were abundant.

Here’s the timeline visualization of the Devonian extinction pulses you asked for — it clearly marks the Kellwasser Event (~374 Ma) and the Hangenberg Event (~359 Ma) along a geological timeline, showing how each crisis unfolded and reshaped life at the end of the Devonian.

📌 Highlights in the image:

Kellwasser Event (~374 Ma): Collapse of tropical reef ecosystems, widespread ocean anoxia, and a major marine extinction wave.

Hangenberg Event (~359 Ma): Final extinction pulse, wiping out placoderms, reducing vertebrate diversity, and linked to climate and sea-level shifts.

Overall Impact: About 70–80% of species lost, with reef systems never fully recovering, paving the way for the Carboniferous world.

Terrestrial Life: First forests of ferns and seedless plants appeared; insects began colonizing land.

Geology: Continents like Euramerica and Gondwana were converging, setting the stage for Pangaea.

💀 Devonian Extinction

Nature of Event: Not a single catastrophe but a series of mass extinctions spread over ~25 million years.

Major Pulses:

Kellwasser Event (≈374 million years ago): Devastated tropical marine ecosystems, especially reefs.

Hangenberg Event (≈359 million years ago): Hit vertebrates hard, eliminating placoderms and reducing vertebrate diversity by ~32%.

Impact:

70–80% of species lost.

Reef systems collapsed and never fully recovered.

Jawless fish nearly disappeared; trilobites and brachiopods severely reduced.

Causes (multiple factors):

Ocean anoxia (lack of oxygen).

Volcanic eruptions releasing mercury and toxic gases.

Climate shifts (warming/cooling cycles).

Possible extraterrestrial impacts (e.g., Siljan Ring crater in Sweden).

Devonian Extinction

📊 Quick Comparison

Aspect Devonian Period Devonian Extinction

Timeframe 419–359 Mya 374–359 Mya (series of events)

Key Lifeforms Fishes, trilobites, ammonoids, early forests Reef-builders, trilobites, placoderms hit hardest

Major Events Rise of amphibians, colonization of land Kellwasser & Hangenberg extinction pulses

Impact Biodiversity expansion 70–80% species loss, reef collapse

Causes Stable warm seas, plant colonization Anoxia, volcanism, climate change, possible impacts

🔑 Takeaway

The Devonian was a turning point in Earth’s history: life expanded onto land, but oceans suffered repeated crises. The extinction events reshaped ecosystems, paving the way for the Carboniferous Period and the eventual rise of modern vertebrates.

ALL THE TIME LINE SUMMERY IN ANIMATED FORMAT START FROM THE CAMBRIAN ERAS TO HUMAN EVOLUTION ERA 5 MAJOR ERAS:

DUNKLEOSTEUS FISH : TERRIBLE LOOKING FISH WHO IS THE APEX PREDATOR DURING LATE DEVONIAN MARINE ECOLOGY

DUNKLEEOSTEUS HUNT FOR DEVONIAN SHARK DURING ANCIENT DEVONIAN PERIOD

The Devonian seas (419–359 million years ago) were vast, warm, and teeming with life, earning the era the title “Age of Fishes.

Tiktaalik roseae was a remarkable Devonian fish (~375–385 million years ago) that combined traits of both aquatic fishes and early land vertebrates