Sentences with phrase «mudstone reefs»
They found the urchins indeed excavated their own cozy cavities within a few months, with shallower pits and flatter urchins occurring on granite reefs, and deeper pits with taller urchins on sandstone and mudstone reefs.
http://www.sciencemag.org/ Not exact matches
In a study published today in PLOS ONE, scientists spent a year observing purple sea urchins (Strongylocentrotus purpuratus, pictured above) growing on sections of sandstone, mudstone, and granite reefs that had been transported into a laboratory setting.