. >> reporter: american paleontologist steve brusatte invited us on his research team's quest. >> youing to find. >> reporter: brusatte has traveled to some of the world's most extreme landscapes. >> i think scotland is one of the most exciting new frontiers for dinosaurs, and there are still a lot of fossils to find here, and they're important orssils. >> reporter: important, because they come from the middle part of the jurassic period, of which little is known, a time when dinosaurs evolved from the size of house cats into the monsters brought to life by hollywood. ( "jurassic park" theme music ) in this real life jurassic park, brusatte is in pursuit of what could be stegosaur bones. >> it's over here, doogie. >> reporter: the discovery trapped in a boulder. >> you can see the texture there, it has the grain of bone, and it has that porous honeycomb type of texture. >> reporter: believe it or not, these orange markings are prehistoric bones preserved in sandstone. paleontology is a lot like detective work. >> detectives put people behind bars. what's your end game here? >> we put

american pailiologist steve brusatte invite us. >> reporter: you never know what you'll find. brusatte trad e of theremelasc.f scotland a fntiers for dinosaurs. there's a lot of fossils to find here and they're important fossils. >> reporter: important because they come from the middle part of the jurassic period, of which little is known. time when dinosaurs evolved from the size of house cats into the monsters brought to live by hollywood. in this real life jurassic park, brusatte is in search of bones the discovery trapped in a boulder. >> okay. you can see the texture there, it has the grain of bone and that porous honeycomb texture. >> reporter: believe it or not these orange markings are prehistoric bones preserved in sandstone. >> this is a set of bones steve and his team have been looking for, for well over a year. they have found them, but now the next challenge is trying to extract this rock to get those bones into a lab for studying. if those are two different bones you have two platy bones. paleontology is like detectiv

let's speak to steve brusatte, a palaeontologist who is in cardiff today talking aboutjurassic park'seashed public interest and obsession with dinosaurs and in that time a bunch of young people of my generation have been going out and travelling around the world, digging up dinosaurs and using new technology to study dinosaurs and we now know more about how they lived and evolved than ever before and i have a new book out about the rise and fall of the dinosaurs and i tell the story, which has only come to pass because of the enthusiasm from jurassic park which has fuelled the renaissance in my field of palaeontology. most of us now how they became extinct, but how did they became extinct, but how did they rise if you like? what were they rise if you like? what were they like as they were evolving? you are right. everybody knows that dinosaurs fell suddenly, their empire collapsed when the big asteroid hit 66 million years ago but the origin story of dinosaurs is even more but the origin story of dinosaurs is even more fascinating because the very first dinosaurs looked nothing like t