We are in Nowhere Wood, about 300 million years ago, staring at a forest of tree ferns, watching them make oxygen. Over the years, these tree ferns have made so much oxygen that its concentration in the air has risen to about 35%, (compare that with the 21% found in the 21st century).
There is so much oxygen that the lightning strikes produce frequent explosions in the air, causing forest fires. Nowhere Wood is a dangerous place to be, sometimes.
The animals are using the oxygen to grown large: some millipedes are 1.5 metres in length and 0.5 metres wide. Some dragonflies have 70 cm wingspans.
With all of this food available, there are opportunities for new carnivorous lizards to appear, including Hylonomus. This is one of the first creatures to have a new eggs with membranes inside, a characteristic later shown by all birds.
Also the flesh-eating Anthracosaurs first appeared at this time. These are the direct ancestors of the dinosaurs, that appeared millions of years later.
In Nowhere Wood, everything is connected together, in space and in time.
So many adventures in space and time, so much opportunity for the evolution of new forms. All of which depends on the formation of sandstone in Nowhere Wood.
- Imagine what it was like to live in Nowhere Wood 300 million years ago. What would be the same and what would be different.
- How do you think the world will change in the future?
We are not alone in Nowhere Wood, about 300 million years ago. We are deep in a forest of tree ferns, towering above us, fifteen metres high. The damp air has a sweet and woody fragrance, heavy with 
The plants are silently photosynthesising, growing ever taller and adding oxygen to the air. Year after year, generation after generation.
The wood in the tree stems is a new invention of evolution: no other plants have wood and fungi have yet to discover a way to eat it. This means that when the trees die and fall into the swampy wet soil, they do not decay, but stayed for thousands of years, gradually 
The tree ferns took carbon dioxide from the air and locked it away as wood and coal. They took so much and the amount of carbon dioxide in the air fell so much, that the climate cooled, lead to the destruction of the tropical forests.
Imagine you had a time machine, where and when would you go? Come with me back to Nowhere Wood, about 300 million years ago. That is long before humans, mammals or even dinosaurs existed, but frogs laid their eggs in pools, much as they do today. Today it is hot, humid and very quiet: with no birdsong or animal noise, apart from the distant croaking of frogs. Tomorrow, there will be a raging tropical storm and the mountain will be pounded by its violence.
Nowhere Wood is located just above the equator, and we are looking up at the aftermath of a series of global catastrophes, which has taken hundreds of million years to happen. Two continents collided and sent shockwaves through the land, pushing upwards to form the mountains that we can see ahead of us. We are in a valley, downstream from a range of tall mountain peaks.
The mountain rock is soft and is easily 
Mountains become tiny grains of sand settling at the bottom of the smaller streams running through Nowhere Wood. Layers upon layers of