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Let's start from the beginning.

Millions and millions of years ago, planet Earth was absolutely crowded with volcanoes.

As you may know, volcanoes release steam and gasses.

As the years went by, the gasses released from volcanoes formed the atmosphere around the planet, which prevented the steam from disappearing into outer space.

The steam eventually, in cycles, began to fall back to Earth. Viola, rain had just been "invented".

As more and more rain fell, considering almost every surface of the planet was volcanic, the water began to build up and "flood" the planet. Many active volcanoes had now been transformed into underwater volcanoes.

As more and more years went by, eventually, bacteria in the water slowly began to evolve, first into jelly-fish like creatures, then tadpole-like creatures, leading all the way up to large ferocious underwater reptiles, amphibians and fish.

As the planet started to warm up, probably by methane gasses released from the prehistoric underwater creatures, the water levels on Earth began to drop again. At the same time, the active underwater volcanoes were creating new landmasses, either by lava cooling on the surface of the water or tectonic plates pushing the volcano above sea level.

So, this, is how fossils of sea creatures ended up in high land-based mountains.

Because millions of years ago, most of Earth was underwater until the water levels dropped or lands "grew" higher.

The Rocky Mountains were once underwater.

If you take a look at images of the Grand Canyon in the United States, you'll see that it resembles the deep caverns and canyons that you find at the bottom of oceans.

That's because the Grand Canyon WAS at the bottom of an ocean.

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Related Questions

Why are ocean fossils found on top of Rocky Mountains?

Obviously the soil and rocks that are now on top of the mountain were once underneath the ocean. This occurs when the ground is raised up from beneath the sea by plates colliding and raising mountains.


Which ocean touches the rocky mountain states?

none of the oceans touch the rocky mountain states because they are all in the middle of the U.S.


What rocky mountain state is found north of Nevada?

IdahoIdaho is north of Nevada and it is a rocky mountain state!


What accounts for the presence of marine fossils on mountain tops?

There was water there!!


What ocean touches the Rocky Mountains states?

At the present time, there are no Rocky Mountain States with coasts on any ocean. At some point in Earth's history part of this vast area was submerged as evidenced by ocean creature's fossils being discovered there. There is pessimistic speculation that, in the future, parts of the Rocky Mountain states will have ocean fronts when the San Andreas fault blows and California "falls into the sea." It could happen instantly in true polar wander or a great perturbation.


Where in California did fossils of triceratops appear?

During the time when dinosaurs existed, California was almost entirely submerged under the Pacific Ocean. No fossils of Triceratops have been found in California, and Triceratops lived on the eastern side of the Rocky Mountains, not the west.


Where in the world is the source of the Colorado River?

At La Poudre Pass in the Rocky Mountaii National Park.


What mountain range is found in western north America?

Rocky Mountain Range


What mountain range is found western North America?

Rocky Mountain Range


Where the Rocky Mountain rain shadow can be found?

midwest!


What source is the Colorado river?

It is La Poudre Pass it is found in the Rocky Mountain National Park. It is La Poudre Pass it is found in the Rocky Mountain National Park.


What region in the US is located along the pacific ocean?

Rocky Mountain states