About the origin of Earth

They say many years ago, there were only the sea, the sky and the marine animals.
 One day, the animals gathered and decided to go to the bottom of the ocean to grab some sand and create the Earth. 
Many tried, but the ocean was too deep.
Then came the turn for the Caguama, the biggest turtle ever existed.
After a long journey, got to the bottom and grabbed all the sand it possibly could. 
On its way back most of this sand was gone, except the one inside its nails.
That sand was more than enough to create the Earth.
That's how our Earth was created.
That's how the Seris tell it.