Ultramafic RocksUltramafic Rocks is a scholarly work, published in 1968 in ''Nature''. The main subjects of the publication include shale gas, geochemistry, geochronology, geology, and ultramafic rock. (New York and London: John Wiley, 1967.) 211s. DOI 10.1038/219308B0Related Works Strontium isotope and alkali element abundances in ultramafic rocks Ultrabasic Liquids