Ko ngā toenga kākoa o ngā tipu kua whakapopo ki rō wai, ā, kua tīmata te whakawaro haere. Ka whakaputu haere ngā paparanga rei, ā, mā te wera me te pēhanga e huri ai hei waro koranehe.
Fibrous plant remains that have decomposed in water, and have begun to carbonise. As layers of peat are built up, heat and pressure converts the peat to coal.