By: rkohrs
Image: Callan Bentley
License: Copyright, All Rights Reserved

Uploaded: 7 Nov 2018
Last Updated: 9 Nov 2018

1.17 gigapixels
48,204 x 24,192 pixels
160.7 in X 80.6 in at 300dpi

It's the sandy layer just below the coal seam, at the base of the sandstone.