WordNet sense 1 (arranged in a sequence of grades or ranks):

graded, ranked

WordNet sense 2 ((used of society) socially hierarchical):

class-conscious

WordNet sense 3 (classified according to various criteria into successive levels or layers):

hierarchic, hierarchical, hierarchal

WordNet sense 4 (with one layer on top of another):

layered

WordNet sense 5 (deposited or arranged in horizontal layers):

bedded