You could say all Steve Sweetman had to do, was follow the tracks along the beach. Hundred and thirty million-year-old tracks, that is.

Dinosaur footprints are common here, reports CBS correspondent Richard Roth, lining the shore on what's been called the Isle of Wight's Jurassic coast. And yes, among the fossils he's found here are remains of what you've seen in movies like Steven Spielberg's Jurassic Park.

"They were called in the film 'Velociraptor,' but they were actually a bigger representation of that animal. But the raptor I found here on the Isle of Wight was actually bigger than the one in the kitchen scene in Jurassic Park," said Sweetman.

But "bigger" isn't Sweetman's contribution to science. In fact, most of his discoveries are microscopic. "Most people don't associate paleontology with the work that I do," he said.

Sweetman washes, dries and sifts through bowls of sand. Many of his discoveries are visible only under a microscope. Miniature teeth and tiny bone fragments help him picture a new prehistoric world.

The cliffs along the "Jurassic Coast" are where he recently found remains of eight dinosaurs no one even knew existed. Sweetman also discovered lizards, salamanders and at least six tiny mammals. In total, he discovered 48 new species.

"Well, when I started I didn't really expect to find very much. But as work went on - it was only a period of four years whilst I was actually sieving and picking the fossils - to have found so many, was, it was a 'yes!' moment, it was one of those things I can't describe."

Actually, it's one of those things that's hard to believe. Over four years he's carried about three and a half tons of mud back to his farmhouse.

"I think that anything to do with the world in which the dinosaurs lived is just fascinating. Because they were such enigmatic and intriguing creatures, there is nothing alive quite like them today. So that sparks an interest, and then to put them into the world in which they actually lived, in which they ate the plants and ate each other is just fascinating."

A local museum gets the really big stuff he finds, and by big, we're talking Velociraptor teeth. It seems that in Paleontology, size doesn't always matter.

"Well, every sample that I take, I tend to find something that is new. So you can't put a figure on the number of things that might be discovered in the course of time," said Sweetman. "But there will certainly be new discoveries."