They have indeed. Leonardo Di Vinci remarked about fossils of marine animals that he found in the Alps.
But this is evidence that the rocks now making up the mountains were once loose sediments, sand and silt at the bottom of the seas and not evidence that the mountains themselves were covered by a global flood.
If the "fish bone fossils" had been put down by a global flood 4,000 years ago then we would expect to find them as litter on the surfaces of the rocks across the mountains and other landscapes. Instead, we find the fossils embedded within sedimentary layers and those layers are tilted and thrusted up to form the mountains. We find marine fossils deep within mines high up in the Rocky Mountains.
Here is a picture of a road cut along the Interstate not far from my home -
Notice the bands of sedimentary rock that were horizontal when they were laid down along the coast of a sea that disappeared long ago.
The sediments in the layers near the circle mark "1" contain fossils of creatures that are not found in the other layers. When the environment changed, the creatures disappeared right along with the circumstances that were responsible for that particular color of rock. Geologists call this the Triassic Period.
The sediments near number "2" contain creatures that are not found anywhere else in the other layers as well. This is called the Cretaceous Period.
If you get out of your car and follow the path up and around this ridge line you will get to a spot where dinosaur footprints are preserved in the slanted rock right on the surface.
This is at an elevation of about 6900 above sea level. The peaks farther west rise as high as 14,440 feet. That means these dino foot prints should have been covered by 7540 feet of roiling flood water while the ground was still mud. That much water would have obliterated the footprints! AND we have to ask how the dinosaurs managed to walk up such a steep and muddy slope without using a rope like the gentleman in the picture is doing - and he's standing on hardened stone.
Here's a picture taken off the Oregon coast at a depth shallower than 7500 feet for comparison:
The sea floor is covered with a light silt that rises as smoke if it's disturbed even a little bit. How could the footprints have lasted in mud such as this?
When settlers first came to this area they found the footprints in the stone just as they are today. The "fish bone fossils" are not just
ON the mountains. They are
IN the mountains.
AND they are sorted out by layer according to the specific time period when that particular layer was first laid down under a sea millions of years ago.