Corrections and Clarifications

Carbon-Isotope Composition and the Origin of Calcareous Coal Balls

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Science  07 Jun 1963:
Vol. 140, Issue 3571, pp. 1080
DOI: 10.1126/science.140.3571.1080


in the report "Carbon-isotope composition and the origin of calcareous coal balls," by J. N. Weber and M. L. Keith [Science 138, 900 (1962)], the heading of column 3, Table 1, should have been δO18 rather than δO17. The units in columns 2 and 3 should have been per millage rather than percentage.