Detrital-zircon geochronology and sedimentary provenance

William A. Thomas

(v. 3, no. 4, p. 304–308, doi: 10.1130/RF.L001.1)

On page 307, an age range was printed incorrectly. The error appeared in this sentence: “A non-systematic upward increase in diversity and range of both older and younger ages characterizes the Mississippian–Permian post-Grenville detrital-zircon populations, beginning with a range of 500–400Ma in the Mississippian Surprise Canyon Formation and culminating with a range of 700–250 Ma in the Permian Kaibab Limestone.” The age range 700–250 Ma should have appeared as 740–270 Ma.

Information theory–based measures of similarity for imaging shallow-mantle discontinuities 

C. Bapanayya, P.A. Raju, S.DasSharma, and D.S. Ramesh

(v. 3, no. 4, p. 289–303, doi: 10.1130/L152.1)

On page 291, Figure 2 should have included “(x4)” in the y axis so that it reads “Conversion coefficients (x4).” Also on that page in Equation 1, the negative symbol (–) before the summation symbol (Σ) should not have appeared.