Pseudomatrix

Pseudomatrix, as defined by Bill Dickinson in 1970, is the term for lithic fragments that have been deformed to become (part of or exclusively) a traditional sandstone matrix. This is formed when a lithic-rich sandstone is compacted. The compaction is usually more effective on the (typically) weaker lithic fragments in comparison to the stronger, coarser-grained framework grains. 

This article uses material from the Wikipedia article  Metasyntactic variable, which is released under the  Creative Commons Attribution-ShareAlike 3.0 Unported License.