The Lineage of a Terracycle: Science Fiction

After a terracycle had passed, she crawled out of the sea to see what had become of her children. It was forbidden to interfere until the cycles had passed around and again, giving time enough for all to know the success or failure of the line. It happened that she was the first of the mothers to have set forth a line for the terracycle in question, and so she was the first of the mothers to rouse herself from her sleep beneath the sea and swim to the surface to inspect the fate of the line. At first, she did not understand what it was that she was seeing. She wondered if the line had built a fine and fabulous city near the shore, a fitting view to welcome her back. It was only when she swam closer that she comprehended that mounds of whitened bone lined the shore.

Inspiration: 'Terracycle'- that and the Czerneda book I'm currently reading, I suppose.
Story Potential: High. I say this because I wanted to continue writing even when the time was up. However, first I must finish other things that I've started!
Notes: "My creations have turned into monsters and killed everything!" is way too simple, and to be avoided. Triple threat, I think--to the mothers, to the lines (extinct?), and to the very way of life/biology.