February 09, 2009
Dr Steve Sweetman’s discoveries, found hidden in mud on the Isle of Wight, are around 130 million years old and shed valuable light on the poorly understood world in which well known dinosaurs roamed.
Steve, a research associate with the School of Earth and Environmental Sciences, has found in ancient river deposits, at least eight new dinosaurs, many different types of lizard, frogs, salamanders, and perhaps rarest of all from the time of the dinosaurs, six tiny mammals, some as small as a shrew.
Palaeontologists have previously relied on conventional surface prospecting to collect fossils exposed naturally by weather and waves. Broken bits and pieces of bone stick out of the ground which often leads to a larger fossil being discovered.
The techniques Steve adopted are far more thorough – he carried some three and a half tonnes of mud along beaches and up cliffs in buckets and backpacks before driving samples back to his farm on the island where he has set up his own laboratory.
He dried and sieved it until buckets of mud became bowls of sand and then examined every single grain under a microscope. It wasn’t long before he was picking out tiny fossil bones and teeth.
Steve said: “It has taken me just four years of hard graft to make my discoveries. Living on the Isle of Wight made this research physically possible. You can get to most places within half an hour, so transporting tonnes of mud wasn’t too much of an obstacle. It would have been near impossible if I had been based on the mainland.
“In the very first sample I found a tiny jaw of an extinct newt-sized, salamander-like amphibian and then new species just kept coming.
“Although we knew a lot about the larger species that existed on the island during the Early Cretaceous no-one had ever filled in the gaps. With these discoveries I can paint a really detailed picture of the creatures that scurried at the feet and in the shadows of the dinosaurs,” he said.
The research wouldn’t have happened had it not been for a chance meeting with University of Portsmouth palaeontologist Dr Dave Martill on a beach on the south-west coast of the island. On this beach, while standing on ancient remains – the famous Hypsilophodon Bed, Steve was persuaded to renew his interest in palaeontology and study for a PhD.
Steve grew up on the Isle of Wight, sometimes referred to as ‘Dinosaur Island’ as it is the richest source of dinosaur remains in Europe. He has always been interested in fossils and decided to return there after 25 years on the mainland.