🌿 PREHISTORIC PLANTS: BEFORE TREES EXISTED
PAGE 1 OF 5, THE DEVONIAN WORLD: NO TREES YET
420 MILLION YEARS AGO
A WORLD WITHOUT TREES
Walk across the early Devonian Earth and you would see… almost nothing tall. The landscape is barren red rock stretching to the horizon. No rustling canopy overhead. No forest shade. The tallest "plant" you'd find stands barely 1 metre high, a strange, leafless green stick called Cooksonia. That's it. That was the whole plant kingdom on land. Trees did not exist. The word hadn't been invented yet.
BARREN!
COOKSONIA
🌱 First vascular plant, 430 million years old
📏 Barely 10 cm tall, no leaves, no roots
📏 Barely 10 cm tall, no leaves, no roots
FOSSIL RECORD
🪨 Devonian fossils tell the whole story
🔬 Preserved in rock for 400 million years
🔬 Preserved in rock for 400 million years
PAGE 2 OF 5, THE RACE TO THE SKY BEGINS
385 MILLION YEARS AGO
ARCHAEOPTERIS, EARTH'S FIRST TREE
By the late Devonian, something extraordinary happened. A plant evolved wood, a rigid, lignin-strengthened trunk that could hold weight and grow tall. Archaeopteris was the world's first true tree. Eight metres high. Spreading fern-like branches catching sunlight above all competitors below. Plants had discovered vertical space, and everything changed. The first forest was born.
GROW!
LYCOPSIDS
🌴 Club mosses growing to 5+ metres
🔰 Ancestors of today's tiny club mosses
🔰 Ancestors of today's tiny club mosses
CALAMITES
🎋 Giant horsetails up to 20 metres tall
💧 Thrived in swampy Carboniferous shores
💧 Thrived in swampy Carboniferous shores
TREE FERNS
🌿 Tree ferns towered over the undergrowth
🦕 Dinosaurs would later shelter beneath them
🦕 Dinosaurs would later shelter beneath them
PAGE 3 OF 5, THE CARBONIFEROUS COAL FORESTS
GIANT INSECTS
🦟 Meganeura: dragonfly with 70cm wingspan
💨 35% oxygen made giant insects possible
💨 35% oxygen made giant insects possible
LEPIDODENDRON
🌲 Scale trees grew to 50 metres tall
🔷 Diamond-pattern bark, unique to this era
🔷 Diamond-pattern bark, unique to this era
CARBONIFEROUS PERIOD
THE GREATEST FORESTS EARTH HAS EVER SEEN
359 million years ago, the Carboniferous period began, and with it, the most spectacular forests in Earth's entire history. Vast swampy jungles stretched across supercontinent Pangaea. Lepidodendron scale trees soared 50 metres skyward. Giant horsetails crowded the swamp margins. The air was thick with oxygen, 35%, compared to 21% today. Insects grew to monstrous sizes. Dragonflies with 70-centimetre wingspans hunted through the canopy. This was a world beyond imagination.
MASSIVE!
PAGE 4 OF 5, HOW FORESTS BECAME COAL
THE GREAT BURIAL
FROM LIVING FOREST TO BURIED CARBON
Here is why the Carboniferous period got its name: carbo means coal. The enormous trees that died in the swamp forests were not rotted by bacteria, because bacteria hadn't yet evolved to digest the tough lignin in wood. So when trees fell, they just… piled up. Layer upon layer of dead plant matter built up in the swamp water. Over millions of years, heat and pressure compressed these layers into thick black seams of coal. Every piece of coal you've ever seen was once a living Carboniferous forest.
BURIED!
COAL SEAMS
⛏️ Coal seams: compressed ancient forests
🏭 Powered the entire Industrial Revolution
🏭 Powered the entire Industrial Revolution
LAYER BY LAYER
📚 1 metre of coal = 10 metres of peat
⏳ Took millions of years under pressure
⏳ Took millions of years under pressure
LIVING DESCENDANTS
🌿 Modern ferns are survivors of this era
🪴 Club mosses still grow in forests today
🪴 Club mosses still grow in forests today
PAGE 5 OF 5, THE WORLD FORESTS BUILT
THE LEGACY
300 MILLION YEARS LATER, WE'RE STILL BURNING THOSE FORESTS
Every power station that burns coal, every steam engine that drove the Industrial Revolution, every train that crossed a continent in the 1800s, all were powered by the compressed remains of Carboniferous forests. The trees that died 300 million years ago contain energy from sunlight captured over millions of years of photosynthesis. When we burn coal, we are releasing sunlight that was trapped before the dinosaurs existed. Prehistoric plants literally built the modern world.
AMAZING!
SURVIVORS
🌿 Ferns: living since 360 million years ago
🌍 Unchanged while the world transformed
🌍 Unchanged while the world transformed
REMEMBER
🌿 KEY FACTS
Early Devonian plants were 1 metre tall. Carboniferous trees reached 50 metres. Coal is made from Carboniferous forests buried for 300 million years. Atmospheric oxygen hit 35%, making giant insects possible. Every piece of coal was once a living tree.
🌱 Moss → Vascular Plant
🌳 Vascular Plant → Forest
🔥 Forest → Coal → Industry
🌳 Vascular Plant → Forest
🔥 Forest → Coal → Industry
🧠 QUIZ TIME!
PREHISTORIC PLANTS: BEFORE TREES EXISTED · 5 QUESTIONS
QUESTION 01
How tall were the tallest plants on Earth during the Early Devonian period?
QUESTION 02
What was the name of Earth's first true tree, which evolved around 385 million years ago?
QUESTION 03
Which geological period saw Earth's greatest coal-forming forests, where trees reached 50 metres tall?
QUESTION 04
How large were the giant dragonflies (Meganeura) that lived in Carboniferous forests?
QUESTION 05
Why didn't Carboniferous trees rot when they fell, and what did they eventually become?
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