Related Clues:

• Pedigree
• Study of earth history
• Topic in oil exploration
• Earth science
• Family tree subject
• Family-tree study
• Study of rock groups?
• Line of descent
• Field for a fault-finder?
• The science of the earth's crust
• Scientific study of the earth's crust
• The scientific study of the earth's crust
• Science that deals with the history of rocks
• You need this to get the family in line
• The study of ancestry