The earth on Turtle back

Today I read a story that native people told their children so that they would remember. This story is about a women who is pregnant and his husband uproots a tree, she falls in the hole and falls to the water. The animals catch her and then they try to help her by bringing earth to the top and save the women. They try but fail until a small muskrat and bring up earth. Then they put it on a giant turtles back and it grows. The women then is safe on the turtles back and plants seeds that she grabbed from the tree she uprooted and planted them then the earth formed. I personally think that his story is a myth because I don't think that the earth is a giant turtle because there are multiple islands.