Fossils are mostly found where sedimentary rocks of the right age – which for dinosaurs is the Mesozoic – are exposed. The best places are river valleys, cliffs and hillsides, and human-made exposures such as quarries and road cuttings.

Where are most fossils found in the world?

Dinosaur fossils have been found on every continent of Earth, including Antarctica but most of the dinosaur fossils and the greatest variety of species have been found high in the deserts and badlands of North America, China and Argentina.

Where are fossil usually found?

Fossils are usually found in sedimentary rock (sand, silt or clay that settles to the bottom of an ocean or lake and compresses). Fossils have been found on all continents, but mostly in North and South America, and Asia.

Where are most of Americas fossils Found?

The Southwest and Western Mountain states can claim the most discovery sites, but dinosaur fossils have been found as far north as Alaska, as far east as the mid-Atlantic states and as far south as Alabama.

What era is the oldest fossil found?

The oldest known fossils, in fact, are cyanobacteria from Archaean rocks of western Australia, dated 3.5 billion years old. This may be somewhat surprising, since the oldest rocks are only a little older: 3.8 billion years old! Cyanobacteria are among the easiest microfossils to recognize.

Where are the most T rex fossils found?

Paleontologists have found most T. rex fossils in the Northwest, in states such as Montana and South Dakota. T. rex fossils have also been found in Alberta, Canada.

What was bigger than at Rex?

Bigger than Tyrannosaurus rex, Spinosaurus lived during the Cretaceous era between 145.5 and 65.5 million years ago, which was the last period of the Mesozoic Era following the Jurassic Era and ending with the extinction of dinosaurs, except birds. Historically, Spinosaurus was known only from incomplete fossils.