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MUST READ: New species of dinosaur found in eastern Utah rock

SALT LAKE CIT -- Fossils of a previously undiscovered species of dinosaur have been found in slabs of Utah sandstone that were so hard that explosives had to be used to free some of the remains, scientists said Tuesday.

The bones found at Dinosaur National Monument belonged to a type of sauropod -- long-necked plant-eaters that were said to be the largest animal ever to roam land.

The discovery included two complete skulls from other types of sauropods -- an extremely rare find, scientists said.

The fossils offer fresh insight into lives of dinosaurs some 105 million years ago, including the evolution of sauropod teeth, which reveal eating habits and other information, said Dan Chure, a paleontologist at the monument that straddles the Utah-Colorado border.

''You can hardly overstate the significance of these fossils,'' he said.

Of the 120 or so known species of sauropods, complete skulls have been found for just eight. That's mostly because their skulls were made of thin, fragile bones bound by soft tissue that were easily destroyed after death.

''This is absolutely No. 1 in terms of projects I've had the opportunity to work on,'' said Brooks Britt, a Brigham Young University paleontologist who co-authored a study on the fossils along with University of Michigan researchers.

The new species is called Abydosaurus mcintoshi. Researchers say it's part of the larger brachiosaurus family, hulking four-legged vegetarians that include sauropods.

The findings are being published this week in the peer-reviewed science journal Naturwissenschaften.

The bones came from a quarry known as DNM 16. It was discovered in 1977, but intensive excavations didn't get started until the late 1990s.

The skulls were found in 2005. Tantalized researchers, though, were stymied by rocks around the bones that were so hard that workers were unable to break through, even with use of a jackhammers and concrete saws.