Uplifted 470 million years ago by the Poaglisis. The giant 3 metre tall arches were found thundering across vast plains of prairie grass.
A row of optical sensors runs along each side of the upper arch. The inner edge next to the ground level has a row of 33 centimeter long cilia. The ribbed area on the underside of the arch appears to be a series of lungs.
Biologically, they seem similar to lichen, possibly as two or three organisms in symbiosis. They are saprophytic, obtaining nutrients from nonliving organic matter. Reproduction is by division.