If the gravel particles are angular rather than rounded, the conglomerate is called a breccia . This is also sometimes called an argillaceous sandstone . The clays are aligned approximately parallel to each other during compaction as water is squeezed out of the mudstone. While some dolostone was deposited as a dolomite-rich sediment, most dolostone is created by the secondary alteration of what was originally a limestone into dolostone. These are often triggered by earthquakes or very large storms.
Some particles make it all the way to the bottom, where they contribute to bottom-set laminae.