Phoenix Logs/The Ark/Amber Refugia
From Halopedia, the Halo wiki
A translucent amber-like material covers much of the terrain in this unforgiving Refugia. Petrified rivers and lakes form vast, planar surfaces which are only broken by the angular, jutting rock formations that puncture the surface.
Fractures that have splintered into deep chasms reveal the complex Forerunner infrastructure below, and geometrical veins from these underlying structures can be seen striping the upper layers. In places the strong but brittle amber has sheared and degraded into sand, which is then whipped up and sculpted by the wind into dune seas where life struggles to take root.
What life can survive here is extremely alien; huge and bizarre flora spring up through cracks in the rocks, swaying in the breeze and belching spores into the atmosphere if disturbed.