Cross Section of Compaction Band (IMAGE) California Institute of Technology Caption Cross-sectional slice of material showing pore-scale structure in Valley of Fire sandstone: A. Host rock. B. Inside compaction band. Darker spots represent voids, which are clearly more abundant in the host rock that inside the compaction band. Credit José Andrade/Caltech Usage Restrictions Okay with credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.