see my Google Scholar Profile here

2023

41. Crockford, P.W. Bar On, Y.M., Ward, L.M., Milo, R., and Halevy, I. 2023 The Geologic History of Primary Productivity. Current Biology

Press: The New York Times: Exactly how much life is on Earth? by Dennis Overbye

Press: Science Magazine

40. Steiner, Z., Antler, G., Berelson, W.M., Crockford, P.W., Dunlea, A.G., Hou, Y., Adkins, J.F., Turchyn, A.V., and Achterberg, E.P. 2023. Trace Element Geochemistry in North Pacific Red Clay Sediment Porewaters and Implications for Water-Column Studies. Global Biogeochemical Cycles

39. Hodgskiss, M.S., Crockford, P.W. and Turchyn, A.V., 2023. Deconstructing the Lomagundi-Jatuli Carbon Isotope Excursion. Annual Review of Earth and Planetary Sciences

38. Raven, M.R., Crockford, P.W., Hodgskiss, M.S., Lyons, T.W., Tino, C.J. and Webb, S.M., 2023. Organic matter sulfurization and organic carbon burial in the Mesoproterozoic. Geochimica et Cosmochimica Acta, 347, pp.102-115.

2022

37. Peng, Y., Bao, H., Jiang, G., Crockford, P.W., Feng, D., Xiao, S., Kaufman, A., Wang, J., A transient peak in marine sulfate after the 635 Ma Snowball Earth. PNAS.

36. Akers, P., Savarino, J., Caillon, N., Servettaz, APM., Le Meur, E., Magand, O., Martins, J., Agosta, C., Crockford, P.W., Kobayashi, K., Hattori, S., Curran, M., van Ommen, T., Jong, L., Roberts J.L. Sunlight-driven nitrate loss records Antarctic surface mass balance. Nature Communications.

35. Crockford, P.W., Halevy, I. Questioning the paradigm of a phosphate-limited Archean biosphere. Geophysical Research Letters e2022GL099818.

2021

34. Crockford, P.W., Kunzmann, M., Blattler, C., Kalderon-Asael, B., Ahm, A.S., Murphy, J., Halverson G.P., Sharoni, S., Planvsky, N.J., Halevy, I., Higgins, J.A., Reconstructing Neoproterozoic seawater chemistry from early diagenetic dolomite. Geology 49(4), 442-446.

33. Horner, T.J., Crockford, P.W. Barium Isotopes: Drivers, Dependencies and Distribution through Space and Time. Elements in Geochemical Tracers in Earth System Science.

32. Crockford, P.W., Mehra, A., Domack, E., Hoffman, P.F. An occurrence of radially symmetric sedimentary structures in the basal Ediacaran cap dolostone (Keilberg Member) of the Otavi Group. Communications of the Geological Survey of Namibia 23, 26-38.

31. Hodgskiss, M.S., Lalonde, S.V., Crockford, P.W. and Hutchings, A.M., 2021. A carbonate molybdenum isotope and cerium anomaly record across the end-GOE: Local records of global oxygenation. Geochimica et Cosmochimica Acta.

30. Farrell, Ú.C., Samawi, R., Anjanappa, S., Klykov, R., Adeboye, O.O., Agic, H., Ahm, A.S.C., Boag, T.H., Bowyer, F., Brocks, J.J. … Crockford, P.W., … and Sperling, E.A. 2021. The sedimentary geochemistry and paleoenvironments project. Geobiology.

29. Hoffman, P.F., Halverson, G.P., Schrag, D.P., Higgins, J.A., Domack, E.W., Macdonald, F.A., Pruss, S.B., Blattler, C.L., Crockford, P.W., Hodgin, B.E., Bellefroid, E.J., Johnson, B.W., Hodgskiss, M.S.W., Lamothe, K.G.,LoBianco, S.J.C., Busch, J.F., Howes, B.J., Greenman, J.W., Nelson, L.L. “Snowballs in Africa: sectioning along-lived Neoproterozoic carbonate platform and its bathyal foreslope (NW Namibia) Earth-ScienceReviews

28. Cui, H., Kaufman, A.J., Xiao, S., Zhou, C., Zhu, M., Cao, M., Loyd, S., Crockford, P., Liu, X.M., Goderis, S. and Wang, W., 2021. Dynamic interplay of biogeochemical C, S, and Ba cycles in response to Shuram oxygenation event. Journal of the Geological Society.

27. Lipp, A., Shorttle, O., Sperling, E.A., Brocks, J.J., Cole, D.B., Crockford, P.W., Del Mouro, L., Dewing, K.,Dornbos, Q., Emmings, J.F., Farrel, U.C., Jarrett, A., Johnston, B.W., Kabanov, P., Keller, B., Kunzmann, M.,Miler, A.J., Mills, T., O’Connel, B., Peters, S., Planavsky, N.J., Ritzer, S., Schoepfer, S.D., Wilby, P., Yang, J. “The composition and weathering of the continents over geologic time” Geochemical Perspectives Letters v.17

26. Mehra, A., Keller, B., Zhang, T., Tosca, N.J., McLennan, S.M., Sperling, E.A., Brocks, J.J., Cole, D.B., Crockford,P.W., Del Mouro, L., Dewing, K., Dornbos, Q., Emmings, J.F., Farrel, U.C., Jarrett, A., Johnston, B.W., Kabanov,P., Kunzmann, M., Miler, A.J., Mills, T., O’Connel, B., Peters, S., Planavsky, N.J., Ritzer, S., Schoepfer, S.D.,Wilby, P., Yang, J., Strauss, J.V. (2021) “Curation and analysis of global sedimentary geochemical data to informEarth history” GSA Today v.31

2020

25. MacLennan, S.M., Eddy, M.P., Merschat, A., Mehra, A., Crockford, P.W., Maloof, A.C., Southworth, S., Schoene, B. Geologic Evidence for an icehouse before the Sturtian global glaciation Science Advances

24. Hodgskiss, M.S.W., Sansjofre, P., Kunzmann, M., Sperling, E.A., Cole, D.B., Crockford, P.W., Gibson, T.M., Halverson, G.P. A high-TOC shale in low productivity world: the late Mesoproterozoic Arctic Bay Formation, Nunavut Earth and Planetary Science Letters

23. Planavsky, N.J., Reinhard, C.T., Isson, T.T., Ozaki, K., Crockford, P.W. Large Mass-Independent Oxygen Isotope Fractionations in Mid-Proterozoic Sediments: Evidence for a Low-Oxygen Atmosphere? Astrobiology

2019

22. *Hodgskiss, M.S.W., *Crockford, P.W., Peng, Y., Wing, B.A., Horner, T.J., A Productivity Collapse to end Earth’s Great Oxidation. PNAS. (*co-first author)

21. Crockford, P.W., Wing, B.A., Paytan, A., Hodgskiss, M.S.W., Bitterwolf, K.K., Hayles, J., Middleton, J.M., Ahm, A.S., Johnston, D.T., Caxito, F.A., Uhlein G., Halverson G.P., Eickmann, B., Torres, M., Horner, T.J., Ba-isotopic constraints on the origin of post-Marinoan barites. Earth and Planetary Science Letters, 519, p. 234-244.

20. Crockford, P.W., Kunzmann, M., Bekker, A., Hayles, J., Bao, H., Halverson G.P., Peng, Y., Bui, T.H., Cox, G., Gibson T.M., Worndle, S., Rainbird, R., Lepland, A., Swanson-Hysell, N., Master, S., Sreevanis, B., Kuznetsov, A., Krupenik, V., Wing, B.A., Claypool Continued: Extending the isotopic record of sedimentary sulfate. Chemical Geology, 514 pp. 200-225

19. Pellerin, A., Antler, G., Agner Holm, S., Findlay, A., Crockford, P.W., Turchyn, A.V., Jorgensen, B.B., Finster, K. Large Sulfur Isotope Fractionation by Bacterial Sulfide Oxidation. Science Advances

18. Worndle, S.W., Crockford, P.W., Kunzmann, M., Bui, T.H., Halverson, G.P. Linking the Bitter Springs Carbon Isotope Anomaly and Early Neoproterozoic Oxygenation through I/(Ca + Mg) Ratios. Chemical Geology

17. Gibson T.M., Worndle, S., Crockford, P.W., Bui, T.H., Creaser, R., Halverson G.P., accepted Radiogenic isotope chemostratigraphy reveals marine and non-marine depositional environments in the late Mesoproterozoic Borden Basin, Arctic Canada. GSA Bulletin

16. Ward, W.P., Strauss, J.V., Johnson, B.G., McClelland, W.C., Colpron, M., von Gosen, W., Piepjohn, K., Cobble, M.,  Crockford, P.W., Landis, J., Perez, J.L. Age, geochemistry and significance of Devonian felsic magmatism in the north slope terrane, Yukon. GSA Special Papers

15. Nelson, L.L., Strauss, J.V., Crockford, P.W., Cox, G.M., Johnson, B.W., Ward, W., Colpron, M., McClelland, W.C., and Macdonald, F.A. accepted Geochemical constraints on the provenance of pre-Mississippian sedimentary rocks in the North Slope of Yukon and Alaska. GSA Special Papers

2018

14. Crockford, P.W.,  Hayles, J.A., Bao, H., Planavsky, N.J., Bekker, A., Fralick, P., Halverson, G.P., Bui, T.H., Peng, Y., Wing, B.A., Triple Oxygen Isotope Evidence for Limited mid-Proterozoic Primary Productivity. Nature 559 p. 613-161

13. Crockford, P.W., Hodgskiss, M.S.W., Uhlein, G., Caxito, F., Hayles, J. A., Halverson, G.P.,  Linking Paleocontinents through triple oxygen isotope anomalies. Geology 46(2) 179-182

12. Gong, S., Peng, Y., Bao, H., Feng, D., Cao, X., Crockford, P.W., Chen, D., Triple sulfur-isotope relationships during sulfate-driven anaerobic oxidation of methane. Earth and Planetary Science Letters 504 p. 13-20

11. Planavsky, N.J., Cole, D.B., Isson, T.T., Reinhard, C.T., ,Crockford, P.W., Sheldon, N., Lyons, T.W., A Case for low atmospheric oxygen levels during Earth's middle history. Emerging Topics in Life Sciences

10. Lang, X., Shen, B., Peng, Y., Xiao, S., Zhou, C., Bao, H., Kaufman, A.J., Huang, K., Crockford, P.W.,  Liu, Y., Tang, W., Ma, H., Transient marine euxinia at the end of the terminal Cryogenian glaciation. Nature Communications

9. Gibson, T.M., Shih, P.M., Cumming, V.M., Fischer, W.W., Crockford, P.W., Hodgskiss, M.S.W., Worndle, S., Creaser, R.A., Rainbird, R.H., Skulski, T.M., Halverson, G.P., Precise age of Bangiomorpha Pubescens dates the emergence of eukaryotic photosynthesis. Geology 46(2) 135-138

2017

8. Horner, T. J., Pryer, H. V., Nielsen, S. G., Crockford, P.W., Gauglitz, J. M., Wing, B. A., Ricketts, R. D. accepted Pelagic Barite Precipitation at micromolar ambient Sulphate. Nature Communications, 8, p. 1342

7. Macdonald F.A., Karabinos, P.M., Crowley, J.L., Hodgin, E.B., Crockford, P.W., Delano, J., 2017 Bridging the gap between the foreland and hinterland II: Geochronology and tectonic setting of Ordovician magmatism and basin formation on the Laurentian Margin of New England and Newfoundland. American Journal of Science, 317, pp. 555-596

6. Kunzmann, M., Bui, T.H., Crockford, P.W., Halverson, G.P., Scott, G.P., Lyons, T.W., Wing, B.A., 2017 Bacterial sulfur disproportionation constrains timing of Neoproterozoic oxygenation. Geology, 45, pp. 207-210

2016

5. *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. and 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, pp.74-83. (co-first author)

4. Hoffman, P.F., Bellfroid, E.J., Crockford, P.W., de Moor, A., Halverson, G.P., Hodgin, E.B., Hodgskiss, M.S.W., Holtzman, B.K., Jasechko, G.R., Johnson, B.W., Lamothe, K.G., 2016. A misfit Cryogenian diamictite in the Vrede domes, Northern Damara Zone, Namibia: Chuos (Sturtian) or Ghaub (Marinoan) Formation? Moraine or Paleovalley?  Communications of the Geological Survey of Namibia, 17, pp. 1-16 

3. Cox, G.M., Jarret, A., Edwards, D., Crockford, P.W., Halverson, G.P., Collins, A.S., Poirier, and Li, Z.X., 2016. Basin redox and primary productivity within the Mesoproterozoic Roper Seaway. Chemical Geology, 440, pp.101-114.

2015

2. Canil, D., Crockford, P.W., Rossin, R., and Telmer, K., 2015. Mercury in some arc crustal rocks and mantle peridotites and relevance to the moderately volatile element budget of the Earth. Chemical Geology, 396, pp.134-142.

2014

1. Crockford, P.W., Telmer, K. and Best, M., 2014. Dissolution kinetics of Devonian carbonates at circum-neutral pH, 50 bar pCO2, 105˚C, and 0.4 M: The importance of complex brine chemistry on reaction rates. Applied Geochemistry, 41, pp. 128-134