 | Williford, Kenneth H., Ushikubo, Takayuki, Schopf, J. William, Lepot, Kevin, Kitajima, Kouki, Valley, John W. (2013) Preservation and detection of microstructural and taxonomic correlations in the carbon isotopic compositions of individual Precambrian microfossils. Geochimica et Cosmochimica Acta, 104. 165-182 doi:10.1016/j.gca.2012.11.005 | Journal (article/letter/editorial) | | individual Precambrian microfossils Kenneth H. Williford a,⇑, Takayuki Ushikubo a, J. William Schopf b...Wisconsin, 1215 W. Dayton St., Madison, WI 53706, USA b Department of Earth and Space Sciences, Center...University of California, Los Angeles, CA 90095, USA c NASA Astrobiology Institute, Penn State Astrobiology...Astrobiology Research Center, University Park, PA 16802, USA Received 21 February 2012; accepted in revised form...d13Ccarb values (2.9& to 3.4&). In stromatolitic chert of the Min’yar Formation, morphologically diverse |  | Peng, Xiaotong, Guo, Zixiao, House, Christopher H., Chen, Shun, Ta, Kaiwen (2016) SIMS and NanoSIMS analyses of well-preserved microfossils imply oxygen-producing photosynthesis in the Mesoproterozoic anoxic ocean. Chemical Geology, 441. 24-34 doi:10.1016/j.chemgeo.2016.08.011 | Journal (article/letter/editorial) | | Center, Pennsylvania State University, PA 16802, USA d University of Chinese Academy of Sciences, Beijing...respectively, are exceptionally well preserved in chert. NanoSIMS analyses show that metabolically important...the metabolic mode (House et al., 2000, 2013; Williford et al., 2013); and 3) the paleoenvironmental conditions...Metamorphic grade Min'yar Formation; Russia ~740 Ma Chert Laumonite–prehnite–pumpellyite 8.8 Bitter Springs...Gaoyuzhuang Formation; China ~830 Ma Chert n.d. 9.0 ~1500 Ma Chert unmetamorphosed 8.5 Gunflint Formation; |  | Lepot, Kevin, Williford, Kenneth H., Ushikubo, Takayuki, Sugitani, Kenichiro, Mimura, Koichi, Spicuzza, Michael J., Valley, John W. (2013) Texture-specific isotopic compositions in 3.4Gyr old organic matter support selective preservation in cell-like structures. Geochimica et Cosmochimica Acta, 112. 66-86 doi:10.1016/j.gca.2013.03.004 | Journal (article/letter/editorial) | | cell-like structures Kevin Lepot a,b,⇑, Kenneth H. Williford a,c, Takayuki Ushikubo a, Kenichiro Sugitani d...Wisconsin, 1215 W. Dayton St., Madison, WI 53706, USA b Université Lille 1, Laboratoire Géosystèmes...Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109, USA d Department of Environmental Engineering and Architecture...microstructures is still difficult to rule out. The 3.5 Ga Apex chert (Australia) OM filaments, initially reported as the...that these filaments occur in a massive OM-rich chert vein (Brasier et al., 2002) that was submitted to |  | Williford, Kenneth H., Van Kranendonk, Martin J., Ushikubo, Takayuki, Kozdon, Reinhard, Valley, John W. (2011) Constraining atmospheric oxygen and seawater sulfate concentrations during Paleoproterozoic glaciation: In situ sulfur three-isotope microanalysis of pyrite from the Turee Creek Group, Western Australia. Geochimica et Cosmochimica Acta, 75 (19) 5686-5705 doi:10.1016/j.gca.2011.07.010 | Journal (article/letter/editorial) | | Turee Creek Group, Western Australia Kenneth H. Williford a,⇑, Martin J. Van Kranendonk b,c, Takayuki Ushikubo...Wisconsin, 1215 W. Dayton St., Madison, WI 53706, USA b Geological Survey of Western Australia, 100 Plain...E-mail address: kwilliford@geology.wisc.edu (K.H. Williford). 0016-7037/$ - see front matter Ó 2011 Elsevier...oxidative weathering on the continents. 5688 K.H. Williford et al. / Geochimica et Cosmochimica Acta 75 (2011)...(BIF) weathering grey-black. A 15 cm “transitional chert” unit conformably overlies the Boolgeeda Iron Fm |  | Morag, Navot, Williford, Kenneth H., Kitajima, Kouki, Philippot, Pascal, Van Kranendonk, Martin J., Lepot, Kevin, Thomazo, Christophe, Valley, John W. (2016) Microstructure-specific carbon isotopic signatures of organic matter from ∼3.5 Ga cherts of the Pilbara Craton support a biologic origin. Precambrian Research, 275. 429-449 doi:10.1016/j.precamres.2016.01.014 | Journal (article/letter/editorial) | | biologic origin Navot Morag a,∗ , Kenneth H. Williford a,b , Kouki Kitajima a , Pascal Philippot c ,...53706, USA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA c Institut...Dresser Formation bedded cherts and hydrothermal chert vein using in situ Secondary-Ion Mass Spectrometry...the abundance of OM in sub-seafloor hydrothermal chert veins. The range of ␦13 C(OM) values observed in...and microfossils occurring in ca. 3.5 Ga bedded chert-barite deposits of the Dresser Formation of the |  | | Journal (article/letter/editorial) | | astronomical time scale for the deep-sea bedded chert sequence (Inuyama, Japan): Implications for Triassic–Jurassic...Keywords: astronomical time scale deep-sea bedded chert precession eccentricity Jurassic end-Triassic extinction...constructed from the early Mesozoic deepsea bedded chert sequence exposed in the Inuyama area, central Japan...bedded chert display a full range of climatic precession related cycles; ∼20-kyr cycle as a chert–shale...405-, 2000- to 4000-, and 10,000-kyr cycles as chert bed thickness variation. The newly established ATS |  | Oehler, Dorothy Z., Walsh, Maud M., Sugitani, Kenichiro, Liu, Ming-Chang, House, Christopher H. (2017) Large and robust lenticular microorganisms on the young Earth. Precambrian Research, 296. 112-119 doi:10.1016/j.precamres.2017.04.031 | Journal (article/letter/editorial) | | Planetary Science Institute, Tucson, AZ 85719, USA 2 School of Plant, Environmental and Soil Sciences...Louisiana State University, Baton Rouge, LA 70803-2110, USA 3 Graduate School of Environmental Studies, Nagoya...California at Los Angeles, Los Angeles, CA 90095-1567, USA 6 Department of Geosciences, The Pennsylvania State...State University, University Park, PA 16802, USA * corresponding author ABSTRACT In recent years, remarkable...observed when analyzing the less carbon-rich natural chert PPRG#215-1 standard. In part due to concern that |  | Flannery, David T., Allwood, Abigail C., Summons, Roger E., Williford, Kenneth H., Abbey, William, Matys, Emily D., Ferralis, Nicola (2018) Spatially-resolved isotopic study of carbon trapped in ∼3.43 Ga Strelley Pool Formation stromatolites. Geochimica et Cosmochimica Acta, 223. 21-35 doi:10.1016/j.gca.2017.11.028 | Journal (article/letter/editorial) | | C. Allwood a, Roger E. Summons b, Kenneth H. Williford a, William Abbey a, Emily D. Matys b, Nicola Ferralis...California Institute of Technology, Pasadena, CA 91109, USA Department of Earth, Atmospheric and Planetary Sciences...Massachusetts Institute of Technology, MA 02139, USA c Department of Materials Science and Engineering...Massachusetts Institute of Technology, Cambridge, MA 02139, USA b Received 7 February 2017; accepted in revised...by Kita et al. (2009), Valley and Kita (2009), Williford et al. (2016, 2011) and Ushikubo et al. (2014) |  | Schopf, J. William, Kudryavtsev, Anatoliy B., Osterhout, Jeffrey T., Williford, Kenneth H., Kitajima, Kouki, Valley, John W., Sugitani, Kenichiro (2017) An anaerobic ∼3400 Ma shallow-water microbial consortium: Presumptive evidence of Earth’s Paleoarchean anoxic atmosphere. Precambrian Research, 299. 309-318 doi:10.1016/j.precamres.2017.07.021 | Journal (article/letter/editorial) | | Kudryavtsev, Jeffrey T. Osterhout, Kenneth H. Williford, Kouki Kitajima, John W. Valley, Kenichiro Sugitani...Schopf, A.B. Kudryavtsev, J.T. Osterhout, K.H. Williford, K. Kitajima, J.W. Valley, K. Sugitani, An anaerobic...Los Angeles 2 Los Angeles, California 90095-1567 USA Phone: (310) 825-1170 E-mail: schopf@epss.ucla.edu...consortium preserved in shallow water carbonaceous chert of the Paleoarchean (~3400 Ma) Strelley Pool Formation...the permineralized fossils to the encompassing chert; their uncompacted minimally altered “life-like” |  | Qu, Yuangao, Wang, Jiasheng, Xiao, Shuhai, Whitehouse, Martin, Engdahl, Anders, Wang, Guangzhe, McLoughlin, Nicola (2017) Carbonaceous biosignatures of diverse chemotrophic microbial communities from chert nodules of the Ediacaran Doushantuo Formation. Precambrian Research, 290. 184-196 doi:10.1016/j.precamres.2017.01.003 | Journal (article/letter/editorial) | | diverse chemotrophic microbial communities from chert nodules of the Ediacaran Doushantuo Formation Yuangao...diverse chemotrophic microbial communities from chert nodules of the Ediacaran Doushantuo Formation, Precambrian...diverse chemotrophic microbial communities from chert nodules of the Ediacaran Doushantuo Formation Yuangao...China d Department of Geosciences, Virginia Tech, USA e MAX IV Laboratory, Lund University, Sweden f...acanthomorphic acritarchs, are preserved in DST chert nodules. To better understand the geomicrobiological |  | Tartèse, Romain, Chaussidon, Marc, Gurenko, Andrey, Delarue, Frédéric, Robert, François (2016) Oxygen isotope analysis of fossil organic matter by secondary ion mass spectrometry. Geochimica et Cosmochimica Acta, 182. 24-39 doi:10.1016/j.gca.2016.02.035 | Journal (article/letter/editorial) | | Eocene Clarno and Early Devonian Rhynie continental chert samples and on two immature coal samples range between...cyanobacteria-derived organic matter from the Silurian Zdanow chert sample yielded d18O values in the range 12–20‰....proposed to explain the observed secular trend of the chert d18O values: (1) Archean oceans were characterised...MarinCarbonne et al., 2012). For the ca. 1.9 Ga Gunflint chert for example, this observation implies a lowering...Wacey et al., 2011; Bontognali et al., 2012; Williford et al., 2013; Fischer et al., 2014), their O isotope |  | Fujisaki, Wataru, Matsui, Yohei, Asanuma, Hisashi, Sawaki, Yusuke, Suzuki, Katsuhiko, Maruyama, Shigenori (2018) Global perturbations of carbon cycle during the Triassic–Jurassic transition recorded in the mid-Panthalassa. Earth and Planetary Science Letters, 500. 105-116 doi:10.1016/j.epsl.2018.07.026 | Journal (article/letter/editorial) | | Eastern Panthalassa (Ward et al., 2001, 2004; Williford et al., 2007). These investigations during the...Radiolarian zone; CZ, Conodont zone. the individual chert beds gradually decreases upwards in the study interval...interval (Figs. 2B and 2D). A distinct purple chert and thick shale interbed (ca. 6 cm) occurs in the...posthernsteini) were found in the distinct purple chert (Fig. 2A). The first appearance datum (FAD) of Jurassic...tanuense) was confirmed just above the distinct purple chert (Fig. 2A). The depositional age of the LAD of Triassic |  | Partin, C.A., Lalonde, S.V., Planavsky, N.J., Bekker, A., Rouxel, O.J., Lyons, T.W., Konhauser, K.O. (2013) Uranium in iron formations and the rise of atmospheric oxygen. Chemical Geology, 362. 82-90 doi:10.1016/j.chemgeo.2013.09.005 | Journal (article/letter/editorial) | | Geophysics, Yale University, New Haven, CT 06520, USA d Institut Français de Recherche pour l'Exploitation... University of California, Riverside, CA 92521, USA f Dept. of Earth and Atmospheric Sciences, University...Ontario, Canada South Dakota, USA Ontario, Canada Zimbabwe Minnesota, USA Baffin Island, Canada Wind River...River Range, Wyoming, USA Western Australia South Dakota, USA South Africa Western Australia South Africa...Dakota, USA South Dakota, USA South Dakota, USA Minnesota, USA Minnesota, USA South Dakota, USA Michigan |  | Manning-Berg, Ashley, Wood, R., Williford, Kenneth, Czaja, Andrew, Kah, Linda (2019) The Taphonomy of Proterozoic Microbial Mats and Implications for Early Diagenetic Silicification. Geosciences, 9 (1) 40 doi:10.3390/geosciences9010040 | Journal (article/letter/editorial) | | Manning-Berg 1,2, * , R. Seth Wood 1,3 , Kenneth H. Williford 4 , Andrew D. Czaja 5 and Linda C. Kah 1 1 2 3...The University of Tennessee, Knoxville, TN 37996, USA; woodr@wustl.edu (R.S.W.); lckah@utk.edu (L.C.K.)...Western Reserve University, Cleveland, OH 44106, USA Department of Earth and Planetary Sciences, Washington...63130, USA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA; Kenneth...University of Cincinnati, Cincinnati, OH 45221-0013, USA; andrew.czaja@uc.edu Correspondence: Ashley.Manning-Berg@case |  | | Journal (article/letter/editorial) | | formation of granules in late Palaeoproterozoic chert from Lake Superior Dominic Papineau, Zhenbing She...formation of granules in late Palaeoproterozoic chert from Lake Superior, Chemical Geology (2017), doi:...formation of granules in late Palaeoproterozoic chert from Lake Superior DOMINIC PAPINEAU1,2,3, ZHENBING...granules in intercolumnar space of stromatolitic chert are poorly documented and explained. Furthermore...and MA haematitic. Stromatolitic organic-rich chert from the Gunflint Fm contains granules with euhedral |  | Van Kranendonk, Martin J., Mazumder, Rajat, Yamaguchi, Kosei E., Yamada, Koji, Ikehara, Minoru (2015) Sedimentology of the Paleoproterozoic Kungarra Formation, Turee Creek Group, Western Australia: A conformable record of the transition from early to modern Earth. Precambrian Research, 256. 314-343 doi:10.1016/j.precamres.2014.09.015 | Journal (article/letter/editorial) | | 36 non-magnetic shale and ferruginous chert and grey chert, reflecting a gradual loss of iron 37 ...and magnetic, ferruginous and jaspilitic 167 chert of the Boolgeeda Iron Formation of the Hamersley...1981; 168 Martin, 1999; Van Kranendonk, 2010; Williford et al., 2011). The shallow-water (beach, 169...of millimetre- 183 bedded grey and jaspilitic chert, and a monotonous facies of interbedded fine-grained...Deepdale localities. 202 3.1.1 Facies A: chert‐ferruginous chert 203 Description: The rocks of Facies |  | | Journal (article/letter/editorial) | | geology and sulfur-isotopic data (Martin, 1999; Williford et al., 2011; Swanner et al., 2013; Van Kranendonk...obtained at the Boundary Ridge section (Figs. 1, 2; Williford et al., 2011; Swanner et al., 2013). Two well-preserved...400 mthick MBM situated 50 km to the southeast. Williford et al. (2011) combined this stratigraphic interpretation...iron-dominated lithologies such as green siltstone, chert-dominated iron formation and banded iron formation...variable proportions of carbonate and chlorite. Chert-dominated iron formation consists of microcrystalline |  | | Report (volume) | | GEOLOGICAL SURVEY OF MISSOURI. ARTHUR WINSLOW, STATE GEOLOGIST. VOL. II . A REPORT 0:N THE IRON...IRON ORES OF MISSOURI FROM FIELD WORK PROSECUTED DURING THE YEARS T891 and 1892. W i th 6 2 Illu s trat...Polk County. LETTER OF TRANSMITTAL. 0FFICI~ OF THE GEOLOGICAL SURVEY,} JEFFERSON CITY, MISSOURI, December...transmit, herewith, a Report upon the Iron Ores of Missouri, by Mr. Frank L. Nason, assistant geologist. Dnring... the two important iron mines of southeastern Missouri, the Iron IIIOuntain and Pilot Knob deposits, |  | | Report (issue) | | .............................................8 Chert Member .......................................................................................15 Chert Member............................................Endicott Mountains Allochthon in area of the Red Dog Mine........................3 Diagram showing stratigraphic.........10 Photographs of lithologic features of chert member of Otuk Formation in diamond-drill hole 927...on regional correlations). The informal shale, chert, and limestone members of the Otuk are recognized |  | Guo, Zixiao, Peng, Xiaotong, Czaja, Andrew D., Chen, Shun, Ta, Kaiwen (2018) Cellular taphonomy of well-preserved Gaoyuzhuang microfossils: A window into the preservation of ancient cyanobacteria. Precambrian Research, 304. 88-98 doi:10.1016/j.precamres.2017.11.007 | Journal (article/letter/editorial) | | Cincinnati, PO Box 210013, Cincinnati, Ohio 45221-0013, USA * Corresponding author: xtpeng@idsse.ac.cn ABSTRACT...Gaoyuzhuang microfossils are mainly preserved in black chert layers and that silica particles can be found within...walls and sheaths over cell contents in Precambrian chert. We proposed a potential taphonomic model, perhaps...atmosphere on the Earth (House et al., 2000; Williford et al., 2013; Peng et al., 2016; Soo et al., 2017)...characterized by alternating black organic-rich chert bands and white carbonate bands at the centimeter |  | | Journal (article/letter/editorial) | | Roerdink et al. (2016), Muller et al. (2016), Williford et al. (2016). Note that for Wacey et al. (2010)...2013; Gregory et al., 2015; Muller et al., 2016; Williford et al., 2016), and the results show larger (up...few previous studies (e.g., Guy et al., 2012; Williford et al., 2016). Hence, before coming to the conclusion...Formation (3.2–2.94 Ga) that comprises sandstone, chert, gabbro, and (ultra)mafic volcanics, and the overlying...Formation dominated by BIF (Banded Iron Formation), chert and shale. The Gorge Creek, Whim Creek, Mosquito |  | | Journal (article/letter/editorial) | | Sciences, Harvard University, Cambridge, MA 02138, USA School of Earth and Ocean Sciences, University of...proposed earlier by Moore et al. (2001, 2012) and Williford et al. (2011). 2.22 Ga South 2. North America...widespread erosion surface overlain by a distinctive chert-breccia/conglomerate (Bevetts conglomerate), which...base of the Pretoria Group (Coetzee, 2001). The chert-breccia/conglomerate is draped by mudstone with...Rietfontein Member is sharply overlain by poorly-sorted chert-pebble conglomerate of the basal Boshoek Formation |  | Yan, Hao, Pi, Daohui, Jiang, Shao-Yong, Hao, Weiduo, Cui, Huan, Robbins, Leslie J., Mänd, Kaarel, Li, Long, Planavsky, Noah J., Konhauser, Kurt O. (2020) Hydrothermally induced 34S enrichment in pyrite as an alternative explanation of the Late-Devonian sulfur isotope excursion in South China. Geochimica et Cosmochimica Acta, 283. 1-21 doi:10.1016/j.gca.2020.05.017 | Journal (article/letter/editorial) | | Geology & Geophysics, Yale University, New Haven, CT, USA. Group of Analytical, Environmental and Geo- Chemistry...2016). Deep water sediments, such as a radiolarian chert, indicate that the Youjiang Basin was a rift environment...the basin was filled with argillaceous limestone, chert and shale. The latter may represent a true deep...47 and 234 m in thickness and consists mainly of chert intercalated with micritic limestone (Huang et al...three distinct horizons separated by layers of chert and siliceous limestone. The mineral assemblage |  | Gardiner, Nicholas J., Wacey, David, Kirkland, Christopher L., Johnson, Tim E., Jeon, Heejin (2019) Zircon U–Pb, Lu–Hf and O isotopes from the 3414 Ma Strelley Pool Formation, East Pilbara Terrane, and the Palaeoarchaean emergence of a cryptic cratonic core. Precambrian Research, 321. 64-84 doi:10.1016/j.precamres.2018.11.023 | Journal (article/letter/editorial) | | SPF consists of silicified sandstone, carbonate, chert, and volcaniclastic sediments, which were deposited...2015; Wacey et al., 2011; Wacey et al., 2012; Williford et al., 2013); multiple morphological types of...overlain by ~15 m of (mostly silicified) carbonate and chert, and capped by ~5 m of silicified volcanic ash and...para-conformable with basaltic rocks interlayered with chert, 6 which together comprise the ca. 3350–3335 Ma...volcanic rocks, mafic volcanic rocks and black chert (Figs. 3D–E). Zircons were obtained from a sample |  | | Journal (article/letter/editorial) | | of atmospheric oxygen (Van Kranendonk, 2010; Williford et al., 2011). The Turee Creek Group is unconformably...to cobbles) of banded-iron-formation (BIF) and chert within a sandy matrix rich in secondary magnetite...Member with its pebbles and cobbles of BIF and chert derived from the immediately underlying Hamersley...Pennsylvanian to Jurassic examples from the western interior USA. In: Etridge, F.G., Flores, R.M. (Eds.), Recent and...eastern India). Sedimentary Geology 238, 145– 155. Williford, K.H., Van Kranendonk, M.J., Ushikubo, T., Kozdon |
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