References
- Fenton , Fenton . 1951 . Racks and Their Stories , New York : Double-day and Co. .
- Gilluly . 1959 . Principles of Geology , 2d ed. , San Francisco : W. H. Freeman and Co. .
- Lahee , Frederic H. 1961 . Field Geology , 6th ed. , New York : McGraw-Hill .
- Ordway , Richard J. 1972 . Earth Science , 2d ed. , New York : Van Nostrand Reinhold Co. .