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Microbially influenced formation of Neoarchean ooids.
Flannery DT, Allwood AC, Hodyss R, Summons RE, Tuite M, Walter MR, Williford KH. Flannery DT, et al. Among authors: williford kh. Geobiology. 2019 Mar;17(2):151-160. doi: 10.1111/gbi.12321. Epub 2018 Nov 18. Geobiology. 2019. PMID: 30450841
In situ radiometric and exposure age dating of the martian surface.
Farley KA, Malespin C, Mahaffy P, Grotzinger JP, Vasconcelos PM, Milliken RE, Malin M, Edgett KS, Pavlov AA, Hurowitz JA, Grant JA, Miller HB, Arvidson R, Beegle L, Calef F, Conrad PG, Dietrich WE, Eigenbrode J, Gellert R, Gupta S, Hamilton V, Hassler DM, Lewis KW, McLennan SM, Ming D, Navarro-González R, Schwenzer SP, Steele A, Stolper EM, Sumner DY, Vaniman D, Vasavada A, Williford K, Wimmer-Schweingruber RF; MSL Science Team. Farley KA, et al. Science. 2014 Jan 24;343(6169):1247166. doi: 10.1126/science.1247166. Epub 2013 Dec 9. Science. 2014. PMID: 24324273
Sulfur-cycling fossil bacteria from the 1.8-Ga Duck Creek Formation provide promising evidence of evolution's null hypothesis.
Schopf JW, Kudryavtsev AB, Walter MR, Van Kranendonk MJ, Williford KH, Kozdon R, Valley JW, Gallardo VA, Espinoza C, Flannery DT. Schopf JW, et al. Among authors: williford kh. Proc Natl Acad Sci U S A. 2015 Feb 17;112(7):2087-92. doi: 10.1073/pnas.1419241112. Epub 2015 Feb 2. Proc Natl Acad Sci U S A. 2015. PMID: 25646436 Free PMC article.
Reply to Dvořák et al.: Apparent evolutionary stasis of ancient subseafloor sulfur cycling biocoenoses.
Schopf JW, Kudryavtsev AB, Walter MR, Van Kranendonk MJ, Williford KH, Kozdon R, Valley JW, Gallardo VA, Espinoza C, Flannery DT. Schopf JW, et al. Among authors: williford kh. Proc Natl Acad Sci U S A. 2015 May 19;112(20):E2560. doi: 10.1073/pnas.1503754112. Epub 2015 Apr 20. Proc Natl Acad Sci U S A. 2015. PMID: 25902537 Free PMC article. No abstract available.
A Field Guide to Finding Fossils on Mars.
McMahon S, Bosak T, Grotzinger JP, Milliken RE, Summons RE, Daye M, Newman SA, Fraeman A, Williford KH, Briggs DEG. McMahon S, et al. Among authors: williford kh. J Geophys Res Planets. 2018 May;123(5):1012-1040. doi: 10.1029/2017JE005478. Epub 2018 May 24. J Geophys Res Planets. 2018. PMID: 30034979 Free PMC article. Review.
27 results