environments'.Heretheprocesseswhichtransportanddepositthesedimentsareessentiallythesamebut,becausethesedimentisdenved,inonecasefromtheerosionofmainlyextrabasinalsourcesandintheothercasefrombiochemicalintrabasinalsources,thefaciestypesandfaciespatternsareverydifferent,especiallytherelationshipofsequencestorelativesea-levelchanges.Inthecaseof'Desertaeoliansystems'and'Glacialsediments'climate,withconsequentdistinctiveprocesses,istheprimefactorindivision.Thesameistruefor'Clasticcoasts'and'Marineevaporites:aridshorelinesandbasins'whichhavebeenseparatedonthebasisoftheirdistinctiveclimatesand,therefore,facies.'Volcanicenvironments',like'Glacialsediments',haveuniquesourcesofsedimentandembraceallotherenvironments.