Related Clues:

• Echelon
• Rank
• Rock unit
• Layer
• Rock layer
• Social level
• Layer of rock
• Bedrock, e.g.
• The layer must get around the tar up there
• Bedrock, e.g
• Geological layer
• Prostitute back in problem level of society
• Caste
• Layer (of rock)
• Bed of sedimentary rock