Archives sédimentaires des
paléoclimats précambriens
galen.halverson [at] mcgill.ca (galen[dot]halverson[at]mcgill[dot]ca)
I am a stratigrapher, sedimentologist, and isotope geochemist. These specializations, within the broad domain of Earth sciences, allow me to interrogate the stratigraphic record using multiple tools, which I employ to infer tectonic, geographic, and environmental information about the ancient Earth. My research is strongly field-based, with field areas that include northern Canada, Svalbard, the Arabian Peninsula, southwestern Africa, and central Australia. This fieldwork takes my research group to remote and evocative locations and provides both the geological context and the rock samples that drive collaborative, interdisciplinary research with paleobiologists, geochronologists, biogeochemists, climate modellers, and other specialists. This research is aimed principally at understanding Earth system evolution during the Proterozoic Eon, which spanned from 2.5 to 0.54 billion years ago— almost half of Earth’s history. This vast interval of time began with the Great Oxidation Event, when oxygen first accumulated in the atmosphere, spanned the origin of eukaryotes, and concluded when the earliest animals first diversified and colonized the seafloor. Recent topics of enquiry include the timing and environment of early eukaryotic evolution, tectonic setting and geodynamic implications of Proterozoic intracratonic basins, Proterozoic sequence stratigraphy, calibration of the Geologic Time Scale, and application of iron isotope and rare Earth element geochemistry to interpreting redox evolution of the oceans. This research increasingly incorporates astrochronology and probabilistic approaches, including Bayesian inference, in generating stratigraphic age models.
Barr, C., Tibby, J., Moss, P.T., Halverson, G.P., Marshall, J.C., McGregor, G.B., Stirling, E., 2017. A 25,000-year record of environmental change from Welsby Lagoon, North Stradbroke Island, in the Australian subtropics. Quaternary International 449, 106-118.
Elsworth, G., Galbraith, E., Halverson, G., Yang, S., 2017. Enhanced weathering and CO2 drawdown caused by latest Eocene strengthening of the Atlantic meridional overturning circulation. Nature Geoscience 10 (3), 213-216.
Eyster, A.E., Fu, R.R., Strauss, J.V., Weiss, B.P., Roots, C.F., Halverson, G.P., Evans, D.A., Macdonald, F.A., 2017. Paleomagnetic evidence for a large rotation of the Yukon block relative to Laurentia: Implications for a low-latitude Sturtian glaciation and the breakup of Rodinia. Bulletin of the Geological Society of America 129 (1-2), 38-58.
Goddéris, Y., Le Hir, G., Macouin, M., Donnadieu, Y., Hubert-Théou, L., Dera, G., Aretz, M., Fluteau, F., Li, Z.X., Halverson, G.P., 2017. Paleogeographic forcing of the strontium isotopic cycle in the Neoproterozoic. Gondwana Research 42, 151-162.
Halverson, G.P., 2017. Introducing the Xenoconformity. Geology 45 (7), 671-672.
Hoffman, P.F., Abbot, D.S., Ashkenazy, Y., Benn, D.I., Brocks, J.J., Cohen, P.A., Cox, G.M., Creveling, J.R., Donnadieu, Y., Erwin, D.H., Fairchild, I.J., Ferreira, D., Goodman, J.C., Halverson, G.P., Jansen, M.F., Le Hir, G., Love, G.D., Macdonald, F.A, Maloof, A.C., Partin, C.A., Ramstein, G., Rose, B.E.J., Rose, C.V., Sadler, P.M., Tziperman, E., Voigt, A. and Warren, S.G., 2017. Snowball Earth climate dynamics and Cryogenian geology-geobiology. Science Advances 3 (11), p.e1600983.
Hoffman, P.F., Lamothe, K.G., LoBianco, S.J.C., Hodgskiss, M.S.W., Bellefroid, E.J., Johnson, B.W., Hodgin, E.B., Halverson, G.P., 2017. Sedimentary depocenters on Snowball Earth: Case studies from the Sturtian Chuos formation in Northern Namibia. Geosphere 13 (3), 811-837.
Kunzmann, M., Bui, T.H., Crockford, P.W., Halverson, G.P., Scott, C., Lyons, T.W., Wing, B.A., 2017. Bacterial sulfur disproportionation constrains timing of neoproterozoic oxygenation. Geology 45 (3), 207-210.
Kunzmann, M., Gibson, T.M., Halverson, G.P., Hodgskiss, M.S.W., Bui, T.H., Carozza, D.A., Sperling, E.A., Poirier, A., Cox, G.M., Wing, B.A., 2017. Iron isotope biogeochemistry of Neoproterozoic marine shales. Geochimica et Cosmochimica Acta 209, 85-105.
Mendes, M., Lobato, L.M., Kunzmann, M., Halverson, G.P., Rosière, C.A., 2017. Iron isotope and REE+Y composition of the Cauê banded iron formation and related iron ores of the Quadrilátero Ferrífero, Brazil. Mineralium Deposita 52 (2), 159-180.
Miller, A.J., Strauss, J.V., Halverson, G.P., Macdonald, F.A., Johnston, D.T., Sperling, E.A., 2017. Tracking the onset of Phanerozoic-style redox-sensitive trace metal enrichments: New results from basal Ediacaran post-glacial strata in NW Canada. Chemical Geology 457, 24-37.
Uhlein, G.J., Uhlein, A., Stevenson, R., Halverson, G.P., Caxito, F.A., Cox, G.M., 2017. Early to late Ediacaran conglomeratic wedges from a complete foreland basin cycle in the southwest São Francisco Craton, Bambuí Group, Brazil. Precambrian Research299, 101-116.
Ader, M., Thomazo, C., Sansjofre, P., Busigny, V., Papineau, D., Laffont, R., Cartigny, P., Halverson, G.P., 2016. Interpretation of the nitrogen isotopic composition of Precambrian sedimentary rocks: Assumptions and perspectives. Chemical Geology 429, 93-110.
Angerer, T., Hagemann, S.G., Walde, D.H.G., Halverson, G.P., Boyce, A.J., 2016. Multiple metal sources in the glaciomarine facies of the Neoproterozoic Jacadigo iron formation in the "Santa Cruz deposit", Corumbá, Brazil. Precambrian Research 275, 369-393.
Cole, D.B., Reinhard, C.T., Wang, X., Gueguen, B., Halverson, G.P., Gibson, T., Hodgskiss, M.S.W., Ryan McKenzie, N., Lyons, T.W., Planavsky, N.J., 2016. A shale-hosted Cr isotope record of low atmospheric oxygen during the Proterozoic. Geology 44 (7), 555-558.
Cox, G.M., Halverson, G.P., Stevenson, R.K., Vokatya, M., Poirier, A., Kunzmann, M., Li, Z.-X., Denyszyn, S.W., Strausse, J.V., Macdonald, F.A., 2016. Continental flood basalt weathering as a trigger for Neoproterozoic Snowball Earth. Earth and Planetary Science Letters 446, 89-99.
Crockford, P.W., Cowie, B.R., Johnston, D.T., Hoffman, P.F., Sugiyama, I., Pellerin, A., Bui, T.H., Hayles, J., Halverson, G.P., Macdonald, F.A., Wing, B.A., 2016. Triple oxygen and multiple sulfur isotope constraints on the evolution of the post-Marinoan sulfur cycle. Earth and Planetary Science Letters 435, 74-83.
Denyszyn, S., Cox, G., Halverson, G., 2016. Geochemistry and Geochronology of Circumferential Dykes of the Franklin LIP: A Rotated Perspective on Plate Reconstruction. Acta Geologica Sinica 90, 30.
Fairchild, I.J., Bonnand, P., Davies, T., Fleming, E.J., Grassineau, N., Halverson, G.P., Hambrey, M.J., McMillan, E.M., McKay, E., Parkinson, I.J., Stevenson, C.T.E., 2016. The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis. Precambrian Research 281, 128-154.
Hoffman, P.F., Bellefroid, E.J., Johnson, B.W., Hodgskiss, M.S.W., Schrag, D.P., Halverson, G.P., 2016. Early extensional detachments in a contractional orogen: Coherent, map-scale, submarine slides (mass transport complexes) on the outer slope of an Ediacaran Collisional Foredeep, Eastern Kaoko Belt, Namibia. Canadian Journal of Earth Sciences 53 (11), 1177-1189.
Shields-Zhou, G.A., Porter, S., Halverson, G.P., 2016. A new rock-based definition for the Cryogenian Period (circa 720 - 635 Ma). Episodes 39 (1), 3-8.
Collins, A.S., Patranabis-Deb, S., Alexander, E., Bertram, C.N., Falster, G.M., Gore, R.J., Mackintosh, J., Dhang, P.C., Saha, D., Payne, J.L., Jourdan, F., Backé, G., Halverson, G.P., Wade, B.P., 2015. Detrital mineral age, radiogenic isotopic stratigraphy and tectonic significance of the Cuddapah Basin, India. Gondwana Research 28 (4), 1294-1309.
Condon, D.J., Boggiani, P., Fike, D., Halverson, G.P., Kasemann, S., Knoll, A.H., Macdonald, F.A., Prave, A.R., Zhu, M., 2015. Accelerating Neoproterozoic research through scientific drilling. Scientific Drilling 19, 17-25.
Cox, G.M., Halverson, G.P., Poirier, A., Le Heron, D., Strauss, J.V., Stevenson, R., 2016. A model for Cryogenian iron formation. Earth and Planetary Science Letters 433, 280-292.
Cox, G.M., Strauss, J.V., Halverson, G.P., Schmitz, M.D., McClelland, W.C., Stevenson, R.S., Macdonald, F.A., 2015. Kikiktat volcanics of Arctic Alaska-Melting of harzburgitic mantle associated with the Franklin large igneous province. Lithosphere 7 (3), 275-295.
Kunzmann, M., Halverson, G.P., Scott, C., Minarik, W.G., Wing, B.A., 2015. Geochemistry of Neoproterozoic black shales from Svalbard: Implications for oceanic redox conditions spanning Cryogenian glaciations. Chemical Geology 417, 383-393.
Lee, C., Love, G.D., Fischer, W.W., Grotzinger, J.P., Halverson, G.P., 2015. Marine organic matter cycling during the Ediacaran Shuram excursion. Geology 43 (12), 1103-1106.
Sossi, P.A., Halverson, G.P., Nebel, O., Eggins, S.M., 2015. Combined separation of Cu, Fe and Zn from rock matrices and improved analytical protocols for stable isotope determination. Geostandards and Geoanalytical Research 39 (2), 129-149.
Sperling, E.A., Wolock, C.J., Morgan, A.S., Gill, B.C., Kunzmann, M., Halverson, G.P., Macdonald, F.A., Knoll, A.H., Johnston, D.T., 2015. Statistical analysis of iron geochemical data suggests limited late Proterozoic oxygenation. Nature 523 (7561), 451-454.
Strauss, J.V., MacDonald, F.A., Halverson, G.P., Tosca, N.J., Schrag, D.P., Knoll, A.H., 2015. Stratigraphic evolution of the neoproterozoic callison lake formation: Linking the break-up of rodinia to the islay carbon isotope excursion. American Journal of Science 315 (10), 881-944.
Ader, M., Sansjofre, P., Halverson, G.P., Trindade, R.I.F., Kunzmann, M., and Nogueira, A.C.R., 2014, Ocean redox structure across the Late Neoproterozoic Oxygenation Event: A nitrogen isotope perspective. Earth and Planetary Science Letters, vol. 396, pp. 1– 13.
Kunzmann, M., Gutzmer, J., Beukes, N.J., Halverson, G.P., 2014. Depositional environment and lithostratigraphy of the paleoproterozoic mooidraai formation, kalahari manganese field, South Africa. South African Journal of Geology 117 (2), 173-192.
Nettle, D., Halverson, G.P., Cox, G.M., Collins, A.S., Schmitz, M., Gehling, J., Johnson, P.R., Kadi, K. 2014, A middle-late Ediacaran volcano-sedimentary record from the eastern Arabian-Nubian shield, Terra Nova, vol. 26, no. 2, pp120-129.
Rebesco, M., Domack, E., Zgur, F., Lavoie, C., Leventer, A., Brachfeld, S., Willmott, V., Halverson, G., Truffer, M., Scambos, T., Smith, J., Pettit, E. 2014, Boundary condition of grounding lines prior to collapse, Larsen-B Ice Shelf, Antarctica, Science, vol. 345, no. 6202, pp. 1354-1358.
Barr, C., Tibby, J., Marshall, J.C., McGregor, G.C., Moss, P., Halverson, G., and Fluin, J., 2013. Combining monitoring, models and palaeolimnology to assess ecosystem response to environmental change at monthly to millennial time scales: The stability of Blue Lake, North Stradbroke Island, Australia. Freshwater Biology, vol. 58, pp. 1614–1630.
Cox, G.M., Halverson, G.P., Minarik, W.G., Le Heron, D.P., Macdonald, F.A., Bellefroid, E.J., Strauss, J.V. 2013, Neoproterozoic iron formation: An evaluation of its temporal, environmental and tectonic significance, Chemical Geology, vol. 362, pp. 232-249.
Johnson, P.R., Halverson, G.P., Kusky, T.M., Stern, R.J., Pease, V. 2013, Volcanosedimentary basins in the arabian-nubian shield: Markers of repeated exhumation and denudation in a neoproterozoic accretionary Orogen, Geosciences (Switzerland), vol. 3, no. 3, pp. 389-445.
Johnston, D.T., Poulton, S.W., Tosca, N.J., O'Brien, T., Halverson, G.P., Schrag, D.P., Macdonald, F.A. 2013, Searching for an oxygenation event in the fossiliferous Ediacaran of northwestern Canada, Chemical Geology, vol. 362, pp. 273-286.
Kunzmann, M., Halverson, G.P., Sossi, P.A., Raub, T.D., Payne, J.L., Kirby, J. 2013, Zn isotope evidence for immediate resumption of primary productivity after snowball Earth, Geology, vol. 41, no. 1, pp. 27-30.
Li, Z.-X., Evans, D.A.D., Halverson, G.P. 2013, Neoproterozoic glaciations in a revised global palaeogeography from the breakup of Rodinia to the assembly of Gondwanaland, Sedimentary Geology, vol. 294, pp. 219-232.
Macdonald, F.A., Strauss, J.V., Sperling, E.A., Halverson, G.P., Narbonne, G.M., Johnston, D.T., Kunzmann, M., Schrag, D.P., Higgins, J.A. 2013, The stratigraphic relationship between the Shuram carbon isotope excursion, the oxygenation of Neoproterozoic oceans, and the first appearance of the Ediacara biota and bilaterian trace fossils in northwestern Canada, Chemical Geology, vol. 362, pp. 250-272.
Payne, J.L., Pearson, N.J., Grant, K.J., Halverson, G.P. 2013, Reassessment of relative oxide formation rates and molecular interferences on in situ lutetium-hafnium analysis with laser ablation MC-ICP-MS, Journal of Analytical Atomic Spectrometry, vol. 28, no. 7, pp. 1068-1079.
Sperling, E.A., Halverson, G.P., Knoll, A.H., MacDonald, F.A., Johnston, D.T. 2013, A basin redox transect at the dawn of animal life, Earth and Planetary Science Letters, vol. 371-372, pp. 143-155.
Caxito, F.D.A., Halverson, G.P., Uhlein, A., Stevenson, R., Gonçalves Dias, T., Uhlein, G.J. 2012. Marinoan glaciation in east Brazil. Precambrian Research, vol. 200-203, no. 2, pp. 38-58.
Cox, G.M., Lewis, C.J., Collins, A.S., Halverson, G.P., Jourdan, F., Foden, J., Nettle, D., Kattan, F., 2012. Ediacaran terrane accretion within the Arabian-Nubian Shield, Gondwana Research, vol. 21, no. 2-3, pp. 341-352.
Gallet, Y., Pavlov, V., Halverson, G., Hulot, G. 2012. Toward constraining the long-term reversing behavior of the geodynamo: A new "Maya" superchron ~1 billion years ago from the magnetostratigraphy of the Kartochka Formation (southwestern Siberia). Earth and Planetary Science Letters, vol. 339, pp. 117-126.
Hoffman, P.F., Halverson, G.P., Domack, E.W., Maloof, A.C., Swanson-Hysell, N.L., Cox, G.M. 2012. Cryogenian glaciations on the southern tropical paleomargin of Laurentia (NE Svalbard and East Greenland), and a primary origin for the upper Russoya (Islay) carbon isotope excursion. Precambrian Research, vol. 206, pp. 137-158.
Macdonald, F. A., Halverson, G. P., Strauss, J. V., Smith, E. F., Cox, G., Sperling, E. A., Roots, C. F. 2012. Early neoproterozoic basin formation in Yukon, Canada: Implications for the make-up and break-up of Rodinia. Geoscience Canada, vol. 39, no. 2, pp. 77-100.
McGee, B., Halverson, G.P., Collins, A.S. 2012. Cryogenian rift-related magmatism and sedimentation: South-western Congo Craton, Namibia. Journal of African Earth Sciences, vol. 76, pp. 34-49.
Sossi, P. A., Foden, J. D., Halverson, G. P. 2012. Redox-controlled iron isotope fractionation during magmatic differentiation: An example from the Red Hill intrusion, S. Tasmania. Contributions to Mineralogy and Petrology, vol. 164, no. 5, pp. 757-772.
Swanson-Hysell, N.L., Maloof, A.C., Kirschvink, J.L., Evans, D.A.D., Halverson, G.P., Hurtgen, M.T. 2012, Constraints on neoproterozoic paleogeography and paleozoic orogenesis from paleomagnetic records of the bitter springs formation, amadeus basin, central Australia, American Journal of Science, vol. 312, no. 8, pp. 817-884.
Arnaud, E., Halverson, G.P., Shields-Zhou, G. 2011. Chapter 1 The geological record of Neoproterozoic ice ages. Geological Society Memoir, vol. 36, no.1, pp. 1-16.
Hall, P.A., McKirdy, D.M., Halverson, G.P., Jago, J.B., Gehling, J.G., 2011. Biomarker and isotopic signatures of an early Cambrian Lagerstätte in the Stansbury Basin, South Australia, Organic Geochemistry, vol. 42, no. 11, pp. 1324-1330.
Halverson, G.P., Poitrasson, F., Hoffman, P.F., Nédélec, A., Montel, J.-M., Kirby, J., 2011. Fe isotope and trace element geochemistry of the Neoproterozoic syn-glacial Rapitan iron formation, Earth and Planetary Science Letters, vol. 309, no. 1-2, pp. 100-112.
Halverson, G.P., Shields-Zhou, G. 2011. Chapter 4: Chemostratigraphy and the Neoproterozoic glaciations. Geological Society Memoir, 36 (1) pp. 51-66.
McKirdy, D.M., Hall, P.A., Nedin, C., Halverson, G.P., Michaelsen, B.H., Jago, J.B., Gehling, J.G., Jenkins, R.J.F., 2011. Paleoredox status and thermal alteration of the lower Cambrian (Series 2) Emu Bay Shale Lagerstätte, South Australia, Australian Journal of Earth Sciences, 58(3), 259-272.
Rice, A.H.N., Edwards, M.B., Hansen, T.A., Arnaud, E., Halverson, G.P. 2011. Chapter 57 Glaciogenic rocks of the Neoproterozoic Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway. Geological Society Memoir, 36 (1) pp. 593-602.
Stodt, F., Rice, A.H.N., Björklund, L., Bax, G., Halverson, G.P., Pharaoh, T.C. 2011. Chapter 58 Evidence of late Neoproterozoic glaciation in the Caledonides of NW Scandinavia. Geological Society Memoir, 36 (1) pp. 603-612
Hoffman, P.F., Halverson, G.P., Accepted. Neoproterozoic glacial record in the Mackenzie Mountains, northwest Canadian Cordillera, Ibid.
Rice, A.H.N., Edwards, M.B., Hansen, T.A., Arnaud, E., Halverson, G.P., Accepted. Glacigenic rocks of the Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway, Ibid.
Halverson, G.P., Wade, B.P., Hurtgen, M.T., Barovich, K.M., 2010. Neoproterozoic chemostratigraphy, Precambrian Research, 182(4), 337-350.
Haberlah, D., Williams, M.J., Halverson, G.P., Hill, S.M., Hrstka, T., Butcher, A.R., McTainsh, G.H., Glasby, P., 2010. Loess and floods: high-resolution multi-proxy data of Last Glacial Maximum (LGM) slackwater deposition in the Flinders Ranges, semi-arid South Australia, Quaternary Science Reviews, 29(19-20), 2673-2693.
Steer, M.A., Halverson, G.P., Fowler, A.J., Gillanders, B.M., 2010. Stock discrimination of Southern Garfish (Hyporhamphus melanochir) by stable isotope ratio analysis of otolith aragonite, Environmental Biology of Fishes, 89(3), 369-381.
Swanson-Hysell, N.L., Rose, C.V., Calmet, C., Halverson, G.P., Hurtgen, M.T., and Maloof, A.C., 2010. Cryogenian onset of a dynamic carbon cycle, Science, 328, 608-611, DOI: 10.1126/science.1184508.
McKirdy, D.M., Thorpe, C.S , Haynes, D.E., Grice, K., Krull, E.S., Halverson, G.P., Webster, L.J., 2010. The biogeochemical evolution of the Coorong during the mid- to late Holocene: An elemental, isotopic and biomarker perspective. Organic Geochemistry, 41, 96-110.
Hoffman, P.F., Calver, C., Halverson, G.P., 2009. Cottons Breccia of King Island, Tasmania: glacial or non-glacial, Cryogenian or Ediacaran? Precambrian Research, 172, 311-322.
Le Hir, G., Donnadieu, Y., Goddéris, Y., Pierrehumbert, R.T., Halverson, G.P., Macouin, M, Néedélec, A., Ramstein, G., 2009. The snowball Earth aftermath: exploring the limits of continental weathering processes, Earth and Planetary Science Letters, 277, 453-463.
Domack, E.W., Halverson, G.P. Willmott, V., Leventer, A., Brachfield, S., Ishman, S., 2007. Spatial and temporal distribution of ikaite crystals in Antarctic glacial marine sediments, United States Geological Survey and The National Academies, USGS OF-2007-1047, Extended Abstract 015, 5p.
Halverson, G.P. Hurtgen, M.T., 2007. Ediacaran growth of the marine sulfate reservoir, Earth and Planetary Science Letters, 263, 32-44.
Halverson, G.P., Dudas, F., Maloof, A.C., Bowring, S.A, 2007. Evolution of the 87Sr/86Sr Composition of Neoproterozoic Seawater, Palaeogeography, Palaeoclimatology, Palaeoecology, 256, 103-129.
Halverson, G.P., Maloof, A.C. Schrag, D.P., Dudas, F., Hurtgen, M.T., 2007. Stratigraphy and geochemistry of a ca 800 Ma carbon isotope interval in northeastern Svalbard, Chemical Geology, 237, 23-45.
Hoffman, P.F., Halverson, G.P., Domack, E.W., Husson, J.M., Higgins, J.A., and Schrag, D.P., 2007. Are basal Ediacaran (635 Ma) post-glacial “cap-dolostones” diachronous? Earth and Planetary Science Letters, 258, 114-131.
Hurtgen, M.T., Halverson, G.P., Arthur, M., and Hoffman, P.F., 2006. Sulfur cycling in the aftermath of a Neoproterozoic (Marinoan) snowball glaciation: evidence for a syn-glacial, sulfidic deep ocean, Earth and Planetary Science Letters, 245, 551-570.
Maloof, A.C., Halverson, G.P., Kirschvink, J.L., Schrag, D.P., Weiss, Benjamin P., Hoffman, P.F., 2006. Combined paleomagnetic, isotopic, and stratigraphic evidence for true polar wander from the Neoproterozoic Akademikerbreen Group, Svalbard, Geological Society of America Bulletin, 118, 1099-1124.
Published Books and Peer-Reviewed Book Chapters:
Halverson, G.P. and Shields, G., In press. Chemostratigraphy and the Neoproterozoic glaciations. In: Arnaud, E., Halverson, G.P. & Shields-Zhou, G.A. (Eds.) The Geological Record of Neoproterozoic glaciations. Geological Society of London.
Halverson, G.P., In press. Glacial sediments and associated strata of the Polarisbreen Group, northeastern Svalbard. In E. Arnaud, G. Shields, and G.P. Halverson (Eds.), The Geological Record of Neoproterozoic Glaciations, Geological Society of London.
Hoffman, P.F., and Halverson, G.P., In press. Neoproterozoic glacial record in the Mackenzie Mountains, northwest Canadian Cordillera. Ibid .
Hoffman, P.F., Macdonald, F.A., and Halverson, G.P., In press. Chemical sediments associated with Neoproterozoic glaciations: Iron formation, cap carbonates, barite, and phosphorite. Ibid.
Rice, A.H.N., Edwards, M.B., Hansen, T.A., Arnaud, E., and Halverson, G.P., In press. Glacigenic rocks of the Smalfjord and Mortensnes formations, Vestertana Group, E. Finnmark, Norway. Ibid.
Stodt, F., Rice, A.H.N., Björklund, L., Bax, G., Halverson, G.P., Pharaoh, T.C., In press. Evidence of late Neoproterozoic glaciation in the Caledonides of NW Scandinavia, Ibid.
Gaucher, C., Sial, A.N., Halverson, G.P., and Frimmel, H.E. (Eds.), 2009. Neoproterozoic-Cambrian Tectonics, Global Change and Evolution: A Focus on Southwestern Gondwana, Developments in Precambrian Geology, Vol. 16. Elsevier, 466 pp.
Gaucher, C., Sial, A.N., Halverson, G.P., and Frimmel, H., 2009. The Neoproterozoic and Cambrian: A time of upheavals, extremes, and innovations. In: Gaucher, C., Sial, A.N., Halverson, G.P., and Frimmel, H.E. (Eds.), Neoproterozoic-Cambrian Tectonics, Global Change and Evolution: A Focus on Southwestern Gondwana. Developments in Precambrian Geology, Vol. 16. Elsevier pp. 3-11.
Halverson, G.P., Hurtgen, M.T., Porter, S.M., and Collins, A.C., 2009. Neoproterozoic-Cambrian biogeochemical evolution, Ibid, pp. 351-365.
Miller, R. McG., Frimmel, H., and Halverson, G.P., 2009. Neoproterozoic to Early Palaeozoic Evolution of Southwestern Africa: Passive Continental Margin Evolution, Ibid, pp. 161-181.
Hoffman, P.F. and Halverson, G.P., 2008. Otavi Group of the western Northern Platform, the Eastern Kaoko Zone and the western Northern Margin Zone. In: R. McG. Miller (Ed.), The Geology of Namibia, Vol. 2, Geological Survey of Namibia (Windhoek), pp. 69-136.
Halverson, G.P., 2006. A Neoproterozoic chronology. In S. Xiao, A.J. Kaufman (Eds.), Neoproterozoic Geobiology and Paleobiology, Topics in Geobiology, 27. Springer, pp. 231-271.
Department of Earth and Planetary Sciences, McGill
Codirection : Joshua Davies
Sujet de recherche : Sequence stratigraphy of late Ediacaran Minankovitch cycles, Nama Group, Namibia.
Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal
Codirection : Joshua Davies
Sujet de recherche : Latest Neoproterozoic Milankovitch in the prelude to the Cambrian explosion of life (NEOMI): Basin-wide correlation of Ediacarian-Cambrian ashes combining high-precision zircon U-Pb geochronology and apatite composition
Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal
Codirection : Joshua Davies
Sujet de recherche : Géochronologie des bassins sédimentaires du paléoprotérozoïque en Australie et en Afrique du Sud afin de comprendre les corrélations entre ces bassins et l'activité magmatique dans leur région
Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal
Codirection : Ross Stevenson; Tiago Novo, Universidade Federal de Minas Gerais, Brésil
Department of Earth and Planetary Sciences, McGill
Codirection : Joshua Davies
Sujet de recherche : The late Paleoproterozoic to early Mesoproterozoic Birindudu Basin (Northern Territory, Australia): Correlations with the McArthur Basin and Tectonic Implications for the development of intracratonic basins.
Department of Earth and Planetary Sciences, McGill
Codirection : Joshua Davies
Sujet de recherche : Stratigraphie séquentielle et chimiostratigraphie de la Plateforme du Saint Laurent, dans la region de Montréal
Department of Earth and Planetary Sciences, McGill
Sujet de recherche : Cryogenian microbialite reef deposits.
Department of Earth and Planetary Sciences, McGill
Codirection : Joshua Davies
Sujet de recherche : Late Ediacaran Microbialites of the Nama Group, Namibia