James Hutton is not as well known as he should be.
In fact, if it weren't for a paper called Illustrations of the Huttonian Theory of the Earth authored by his friend John Playfair and published in 1802, the possibility exists that Hutton's insights and deductions about how our planet The Earth works may have been lost forever.
Although a sparkling conversationist, his ability to write down his ideas in a form that people would easily understand, was lacking. He was highly regarded by his contemporaries in the Scottish Enlightenment, people such as James Watt, Adam Smith, and David Hume.
When Hutton was born, most people thought the Earth was just over 6,000 years old, but by using empirical evidence gleaned later in life, Hutton became convinced that the Earth was a lot older. His most famous visit was to Siccar Point on the Berwickshire coast in the East of Scotland. Here he gazed into deep time, the 'abyss of time' as he called it, where 400-million-year-old Devonian horizontal sandstone sediments lay on the top of 450-million-year-old vertical Silurian rocks.
The surface between the two, called an unconformity, is a visible 50-million years of time where no events are recorded. Hutton found unconformities elsewhere in Scotland and he found instances where granite had intruded into other rocks and this could only have happened if the granite had been liquid or molten. This showed that granite wasn't the oldest rock of The Earth. Hutton realised the heat could only have come from within the planet and he wasn't too far away from working out how continental drift and hence plate tectonics works.
He was also a keen chemist and a innovative farmer concerning crop rotation and land managment.
Also, in one of his tomes called "Elements of Agriculture", he wrote the following:
"....those organised bodies, which most approach to the best constitution for the present circumstances, will be best adapted to continue, in preserving themelves and multiplying the individuals of their race."
words that wouldn't look out of place in a famous publication of 65 years later.