Publications underline denotes UIowa student/post-doc research
57. Stolfus, B.M., Allman, L.J., Young, S.A., Calner, M., Hartke, E.R., Oborny, S.C., Bancroft, A.M., & Cramer, B.D., 2023. Expansion of reducing marine environments during the Ireviken Biogeochemical Event: Evidence from the Altajme Core, Gotland, Sweden. Paleoceanography and Paleoclimatology, v. 38, e2022PA004484. doi: 10.1029/2022PA004484. (PDF)
56. Mills, B.J.W., Krause, A.J., Jarvis, I., & Cramer, B.D., 2023, Evolution of atmospheric O2 through the Phanerozoic, Revisited. Annual Reviews of Earth and Planetary Sciences, v. 51, p. 253-276. doi: 10.1146/annurev-earth-032320-095425.
55. Oborny, S.C., Cramer, B.D., Brett, C.E., & Bancroft A.M., 2022. Chronostratigraphic correlation of the upper Silurian Salina Group for the Michigan and Appalachian basins through coupled (δ13Ccarb) chemostratigraphy and subsurface geophysical analyses. Geosphere, v. 8, n. 6, p. 1910-1925. doi: 10.1130/GES02515.1. (PDF)
54. Shohel, M., Ray, K.K., Tivanski, A.V., McAdams, N.E.B., Bancroft, A.M., Cramer, B.D., Forbes, T.Z., 2022. Nanomechanical variability in the early evolution of vertebrate dentition. Scientific Reports, v. 12, #10203. doi: 10.1038/s41598-022-14157-2. (PDF)
53. Heath, M.N., Cramer, B.D., Stolfus, B.M., Barnes, G.L., Clark, R.J., Day, J.E., Barnett, B.A., Witzke, B.J., Hogancamp, N.J., & Tassier-Surine, S., 2021, Chemoautotrophy as the driver of decoupled organic and carbonate carbon isotope records at the onset of the Hangenber (Devonian-Carboniferous Boundary) Oceanic Anoxic Event. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 577, #110540. doi: 10.1016/j.palaeo.2021.110540. 52. Kerr, P.J., Tassier-Surine, S.A., Kilgore, S.M., Bettis III, E.A., Dorale, J.A., & Cramer, B.D., 2021, Timing, provenance, and implications of multiple MIS 3 advances of the Laurentide ice sheet into the Upper Mississippi River Basin, USA. Quaternary Science Reviews, v. 261, #106926. doi: 10.1016/j.quascirev.2021.106926.
51. Biebesheimer, E., Cramer, B.D., Calner, M., Barnett, B.A., Oborny, S.C., & Bancroft, A.M., 2021, Asynchronous δ13Ccarb and δ13Corg records during the onset of the Mulde (Silurian) positive carbon isotope excursion from the Altajme core, Gotland, Sweden. Chemical Geology, v. 576, #120256. doi: 10.1016/j.chemgeo.2021.120256.
50. Hartke, E.R., Cramer, B.D., Calner, M., Melchin, M.J., Barnett, B.A., Oborny, S.C., & Bancroft, A.M., 2021, Decoupling δ13Ccarb and δ13Corg records during the onset of the Ireviken carbon isotope excursion: Δ13C and organic carbon burial (forg) during a Paleozoic (Silurian) oceanic anoxic event. Global and Planetary Change, v. 196, #103373. doi: 10.1016/j.gloplacha.2020.103373. (PDF)
49. Cramer, B.D., Peate, D.W., & Saltzman, M.R., 2021, GSA statement on diversity, and challenge to the society, geoscience departments, and the geoscience community at large. GSA Today, v. 31, p. 34-36. doi: 10.1130/GSATG472GW.1. (PDF)
48. Stolfus, B.M., Cramer, B.D., Clark, R.J., Hogancamp, N.J., Day, J.E., Tassier-Surine, S.A., & Witzke, B.J., 2020, An expanded stratigraphic record of the Devonian-Carboniferous boundary Hangenberg biogeochemical event from southeast Iowa. Bulletin of Geosciences, v. 95, n. 4, 469-495, doi: 10.3140/bull.geosci.1781. (PDF)
47. Cramer, B.D., & Jarvis, I. 2020. Chapter 11: Carbon Isotope Stratigraphy, in Gradstein, F.M., Ogg, J.G., Schmitz, M.D & Ogg, G.M., (eds.), Geologic Time Scale 2020, Volume 1, Elsevier, Amsterdam, p. 309-343. doi: 10.1016/B978-0-12-824360-2.00011-5.
46. Melchin, M.J., Sadler, P.M., & Cramer, B.D., 2020. Chapter 21: The Silurian Period, in Gradstein, F.M., Ogg, J.G., Schmitz, M.D. & Ogg, G.M., (eds.), Geologic Time Scale 2020, Volume 2, Elsevier, Amsterdam, p. 695-732. doi: 10.1016/B978-0-12-824360-2.00021-8.
45. Oborny, S.C., Cramer, B.D., & Brett, C.E., 2020. High-Resolution Event Stratigraphy (HiRES) across the Cincinnati Arch through integrating conodont, carbon isotope, and gamma ray biochemostratigraphy with sequence stratigraphy. GFF, v. 142, n. 4, p. 309-324. doi: 10.1080/11035897.2020.1819407.
44. Shohel, M., McAdams, N.E.B., Cramer, B.D., & Forbes, T.Z., 2020. Ontogenetic variability in crystallography and mosaicity of conodont apatite: Implications for microstructure, paleothermometry and geochemistry.Royal Society Open Science, v. 7, #200322. doi: 10.1098/rsos.200322. (PDF)
43. Oborny, S.C., Cramer, B.D., Brett, C.E., & Bancroft, A.M., 2020. Integrated Silurian conodont and carbon isotope bio-chemostratigraphy of the East-Central Appalachian Basin. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 554, #109815. doi: 10.1016/j.palaeo.2020.109815.
42. Bancroft, A.M. & Cramer, B.D., 2020. Silurian conodont biostratigraphy of the East-Central Appalachian Basin: Re-examination of the C.T. Helfrich collection. Bulletin of Geosciences, v. 95, n. 1, p. 1-22. doi: 10.3140/bull.geosci.1748 (PDF)
41. Cramer, B.D., Stolfus, B.M., Day, J.E., Clark, R.J., Hogancamp, N.J., Witzke, B.J., & Tassier-Surine, S., 2019. The Devonian-Carboniferous Boundary in the Mississippi River Valley of Iowa, Illinois, and Missouri, in Cramer B.D. (ed.), The Devonian-Carboniferous Boundary in the Type Area of the Mississippian. Iowa Geological Survey Guidebook Series, v. 30, p. 1-9. (PDF)
40. Hogancamp, N.J., Stolfus, B.M., Cramer, B.D., & Day, J.E., 2019. A revised conodont zonation of the Tournaisian (Kinderhookian to lower Osagean) and implications for stratigraphic correlations in North America, in Cramer B.D. (ed.), The Devonian-Carboniferous Boundary in the Type Area of the Mississippian. Iowa Geological Survey Guidebook Series, v. 30, p. 11-17. (PDF)
39. Danielsen, E.M, Cramer, B.D., & Kleffber, M.A., 2019. Identification of a global sequence boundary within the upper Homerian (Silurian) Mulde Event: High-resolution chronostratigraphic correlation of the midcontinent United States with Sweden and the United Kingdom. Geosphere, v. 15, n. 3, p. 839-855. doi: 10.1130/GEOS01685.1 (PDF)
38. McAdams, N.E.B., Cramer, B.D., Bancroft, A.M., Melchin, M.J., Devera, J.A., & Day, J.E., 2019. Integrated δ13Ccarb, conodont, and graptolie bio-chemostratigraphy of the Silurian from the Illinois Basin and stratigraphic revision to the Bainbridge Group. Geological Society of America Bulletin, v. 131, n. 1-2, p. 335-352. doi: 10.1130/B32033.1
37. Schachat, S.R., Labandeira, C.C., Saltzman, M.R., Cramer, B.D., Payne, J.L., & Boyce, K., 2018. Phaneozoic pO2 and the early evolution of terrestrial animals. Proceedings of the Royal Society, Part B, v. 285, n. 1871, #20172631. doi:10.1098/rspb.2017.2631
36. McAdams, N.E.B., Schmitz, M.D., Kleffner, M.A., Verniers, J., Vandenbroucke, T.R.A., Ebert, J.R., & Cramer, B.D., 2018. A new high-precision CA-ID-TIMS date for the 'Kalkberg' K-bentonite (Judds Falls Bentonite). Lethaia, v. 51, p. 344-356. doi: 10.1111/let.12241
35. Waid, C.B., & Cramer, B.D., 2017. Global chronostratigraphic correlation of the Llandovery Series (Silurian System) in Iowa, USA, using high-resolution carbon isotope (δ13Ccarb) chemostratigraphy and brachiopod and conodont biostratigraphy. Bulletin of Geosciences, v. 92, n. 3, p. 373-390. doi: 10.3140/bull.geosci.1657. (PDF)
34. Waid, C.B., & Cramer, B.D., 2017. Telychian (Llandovery, Silurian) conodonts from the LaPorte City Formation of eastern Iowa (East-Central Iowa Basin) and their implications for global Telychian conodont biostratigraphic correlation. Paleontologia Electronica, v. 20, n. 2, paper #39A. (PDF)
33. Oborny, S.C., Cramer, B.D., Heckel, P.H., Ludvigson, G.A., & Henthorne, B., 2017. 'Phylloid-algal' carbonate mound development during regression: Expanding the build-and-fill model. Journal of Sedimentary Research, v. 87, n. 7, p. 688-706. doi: 10.2110/jsr.2017.38.
32. McAdams, N.E.B., Bancroft, A.M., Cramer, B.D., & Witzke, B.J., 2017. Integrated carbon isotope and conodont biochemostratigraphy of the Silurian (Aeronian-Telychian) of the East-Central Iowa Basin, Iowa, USA. Newsletters on Stratigraphy, v. 50, n. 4, p. 391-416. doi: 10.1127/nos/2017/0375.
31. Sullivan, N.B., McLaughlin, P.I., Brett, C.E., Cramer, B.D., Kleffner, M.A., Thomka, J.R., & Emsbo, P., 2016. Sequence boundaries and chronostratigraphic gaps in the Llandovery of Ohio and Kentucky: The record of early Silurian paleoceanographic events in east-central North America. Geosphere, v. 12, n. 6, p. 1813-1832. doi: 10.1130/GES01343.1.
30. Schröer, L., Vandenbroucke, T.R.A., Hints, O., Steeman, T., Verniers, J., Brett, C.E., Cramer, B.D., & McLaughlin, P.I., 2016. A Late Ordovician age for the Whirlpool Formation and Power Glen Formation, New York. Canadian Journal of Earth Sciences, v. 53, n. 7, p. 739-747. doi: 10.1139/cjes-2015-226.
29. Cramer, B.D., Lewandowski, K.J., Goldstein, A., Asher, P., Ryan, J., Schofield, D.I., Buchanon, R., Denne, R., Ausich, W.I., Vandenbroucke, T.R.A., Lundy, S., Priest, R.T., & Clark, R.J., 2015. Who will build the 21st Century? Addressing critical demographic gaps in the geosciences. GSA Today, v. 25, n. 12, p. 36-37. doi:10.1130/GSATG243GW.1. (PDF)
28.Cramer B.D., Vandenbroucke, T.R.A., & Ludvigson, G.A., 2015. High-Resolution Event Stratigraphy (HiRES) and the quantification of stratigraphic uncertainty: Silurian examples of the quest for precision in stratigraphy. Earth-Science Reviews, v. 141, p. 136-153. doi: 10.1016/j.earscirev.2014.11.011. 27. Cramer, B.D., Schmitz, M.D., Huff, W.D., & Bergström, S.M., 2015. High-precision U-Pb zircon age constraints on the duration of rapid biogeochemical events during the Ludlow Epoch (Silurian Period). Journal of the Geological Society (London), v. 172, p. 157-160. doi: 10.1144/jgs2014-094.
26. Sullivan, N.B., Brett, C.E., McLaughlin, P.I., Kleffner, M.A., & Cramer, B.D., 2014. Correlation of the Waco Member (Telychian; Llandovery; Silurian) in East-Central Kentucky and South-Central Ohio. GFF, v. 136, n. 1, p. 254-258.doi: 10.1080/11035897.2013.876657.
25. Cramer, B.D., & Melchin, M.J., 2013. IGCP 591 – The Early to Middle Paleozoic Revolution: A Special Volume in Honor of August F. Foerste. Stratigraphy, v. 10, n. 4, p. 211-212.
24. Rodriguez-Gomez, M.I., Cramer, B.D., Burnham, B., Wang, M., Lu, C., & Aiken, C.L.V., 2013. The Digital Integrated Stratigraphy Project (DISP) development phase II: On-site 3D access, analysis and integration of stratigraphic data using PCs and 3D photorealistic models. Stratigraphy, v. 10, n. 4, p. 255-260.
23. Nardin, E. Vandenbroucke, T.R.A., Cramer, B.D., & Aretz, M., 2013. Palaeozoic stratigraphy: Past, recent advances, and future challenges. Ciências da Terra, v. 18, p. 57-60.
22. Cramer, B.D., Condon, D.J., Söderlund, U., Marshall, C., Worton, G.J., Thomas, A.T., Calner, M., Ray, D.C., Perrier, V., Boomer, I., Patchett, P.J., & Jeppsson, L., 2012. U-Pb (zircon) age constraints on the timing and duration of Wenlock (Silurian) paleocommunity collapse and recovery during the ‘Big Crisis’. Geological Society of America Bulletin, v. 124, p. 1841-1857. doi: 10.1130/B30642.1.
21. Melchin, M.J., Sadler, P.M., & Cramer, B.D., 2012. Chapter 21: The Silurian Period, in Gradstein, F.M., Ogg, J.G., Schmitz, M. & Ogg, G., (eds.), The Geologic Time Scale 2012, Elsevier, New York, p. 525-558. doi: 10.1016/B978-0-444-59425-9.00021-4.
20. Brett, C.E., Cramer, B.D., McLaughlin, P.I., Kleffner, M.A., Showers, W.J., & Thomka, J.R., 2012. Revised Telychian-Sheinwoodian (Silurian) stratigraphy of the Laurentian mid-continent: Building uniform nomenclature along the Cincinnati Arch. Bulletin of Geosciences, v. 87, p. 733-753. doi: 10.3140/bull.geosci.1310. (PDF)
19. Munnecke, A., Cramer, B.D., Boon, D.P., Kharwat, R., Aiken, C.L., & Schofield, D.I., 2012. The Digital Integrated Stratigraphy Project (DISP). Bulletin of Geosciences v. 87, p. 705-712. doi: 10.3140/bull.geosci.1318. (PDF)
18. Kleffner, M.A., Cramer, B.D., Brett, C.E., Mikulic, D.G., Klussendorf, J. & Johnson, T., 2012. Lower Silurian of western Ohio - The case of the disappearing Dayton, and unique Midwestern co-occurrence of pentamerid brachiopods with the Gravicalymene celebra Trilobite Association in the Springfield Formation, in Sandy, M.R. & Goldman, D., (eds.), On and around the Cincinnati Arch and Niagara Escarpment: Geological Field Trips in Ohio and Kentucky for the GSA North-Central Section Meeting, Dayton, Ohio, 2012. Geological Society of America Field Guide, v. 27, p. 1-18. doi:10.1130/20120027(01).
17. Brett, C.E., Cramer, B.D., Datillo, B.F., McLaughlin, P.I., Schramm, T.J., & Thomka, J.R., 2012.Middle Paleozoic Sequence Stratigraphy and Paleontology of the Cincinnati Arch: Part 2 – Northern Kentucky and SE Indiana. Brett, C.E., Cramer, B.D., & Gerke, T.L. (eds.). Post-Meeting Field Guide for the IGCP 591 2nd Annual Meeting, Cincinnati, Ohio, USA, July, 2012. 94 pp. 16. Cramer, B.D., Munnecke, A., Schofield, D.I., Hasse, K.M., & Haase-Schramm, A., 2011.A revised 87Sr/86Sr curve for the Silurian: Implications for global ocean chemistry and the Silurian timescale. Journal of Geology, v. 119, p. 335-349.doi: 10.1086/660117.
15. Cramer, B.D., Brett, C.E., Melchin, M.A., Männik, P., Kleffner, M.A., McLaughlin, P.I., Loydell, D.K., Munnecke, A., Jeppsson, L., Corradini, C., Brunton, F.R., & Saltzman, M.R., 2011. Revised chronostratigraphic correlation of the Silurian System of North America with global and regional chronostratigraphic units and δ13Ccarb chemostratigraphy. Lethaia, v. 44, p. 185-202. doi: 10.1111/j.1502-3931.2010.00234.x.
14. Cramer, B.D., Davies, J.R., Ray, D.C., Thomas, A.T., & Cherns, L., 2011. Siluria Revisited: An Introduction, in Ray, D.C. (ed.). Siluria Revisited: A Field Guide. International Subcommission on Silurian Stratigraphy, Field Meeting 2011, Ludlow, England, p. 6-27. 13. Bergström, S.M., Kleffner, M.A., Schmitz, B., & Cramer, B.D., 2011. Revision of the position of the Ordovician/Silurian boundary in southern Ontario: regional chronostratigraphic implications of δ13C chemostratigraphy of the Manitoulin Formation and associated strata. Canadian Journal of Earth Science, v. 48, p. 1447-1470. doi: 10.1139/E11-039.
12. Cramer, B.D., Loydell, D.K., Samtleben, C., Munnecke, A., Kaljo, D., Männik, P., Martma, T., Jeppsson, L., Kleffner, M.A., Barrick, J.E., Johnson, C.A., Emsbo, P., Joachimski, M.M.,Bickert, T., & Saltzman, M.R., 2010. Testing the limits of Paleozoic chronostratigraphic correlation via high-resolution (<500,000yrs) integrated conodont, graptolite, and carbon isotope (δ13Ccarb) biochemostratigraphy across the Llandovery-Wenlock (Silurian) boundary: Is a unified Phanerozoic timescale achievable?. Geological Society of America Bulletin, v. 122, p. 1700-1716, doi: 10.1130/B26602.1.
11. Cramer, B.D., Kleffner, M.A., Brett, C.E., McLaughlin, P.I., Jeppsson, L., Munnecke, A., & Samtleben, C., 2010. Paleobiogeography, high-resolution stratigraphy, and the future of Paleozoic biostratigraphy: Fine-scale diachroneity of the Wenlock (Silurian) conodont Kockelella walliseri. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 294, p. 232-241, doi: 10.1016/j.palaeo2010.01.002.
10. Cramer, B.D., Saltzman, M.R., Day, J.E., & Witzke, B.J., 2008. Record of the Late Devonian Hangenberg Global Positive Carbon Isotope Excursion in an Epeiric Sea Setting: Carbonate Production, Organic Carbon Burial, and Paleoceanography during the late Famennian, in Pratt, B.R., and Holmden, C., (eds.), Dynamics of Epeiric Seas. Geological Association of Canada Special Paper, v. 48, p. 103-118.
9. McLaughlin, P.I., Cramer, B.D., Brett, C.E., & Kleffner, M.A., 2008. Silurian high-resolution stratigraphy on the Cincinnati Arch: Progress on recalibrating the layer-cake, in Maria, A.H., and Counts, R.C., (eds.), From the Cincinnati Arch to the Illinois Basin: Geological Field Excursions along the Ohio River Valley. Geological Society of America Field Guide, v. 12, p. 119-180. doi: 10.1130/2008.fld012(08).
8. Cramer, B.D., & Munnecke, A., 2008. Early Silurian positive δ13C excursions and their relationship to glaciations, sea-level changes and extinction events: Discussion. Geological Journal, v. 43, p. 517-519, doi: 10.1002/gj.1112.
7. Su, W., Wang, Y., Cramer, B.D., Munnecke, A., Li, Z., & Fu, L., 2008. Preliminary estimation of paleoproductivity via TOC and habitat-types: Which method is more reliable? – A case study on the Ordovician-Silurian transitional black shales of the upper Yangtze Platform, South China. Journal of China University of Geosciences, v. 19, n. 5, p. 534-548.
6. Cramer, B.D., & Saltzman, M.R., 2007. Glaciation, CO2, and organic carbon burial during the early Silurian: New evidence from paired δ13Ccarb and δ13Corg analyses from the mid-continent of North America. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 256, p. 195-203. doi: 10.1016/j.palaeo.2007.02.032.
5. Cramer, B.D., & Saltzman, M.R., 2007. Fluctuations in epeiric sea carbonate production during Silurian positive carbon isotope excursions: A review of proposed paleoceanographic models. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 245, p. 37-45. doi: 10.1016/j.palaeo.2006.02.027.
4. Cramer, B.D., Saltzman, M.R., & Kleffner, M.A., 2006. Spatial and temporal variability in organic carbon burial during global positive carbon isotope δ13Ccarb excursions: New insight from high-resolution δ13Ccarb stratigraphy from the type area of the Niagaran (Silurian) Provincial Series. Stratigraphy, v. 2, n. 4, p. 327-340.
3. Cramer, B.D., Kleffner, M.A., & Saltzman, M.R., 2006. The late Wenlock ‘Mulde’ positive carbon isotope excursion in North America. GFF, v. 128, p. 85-90.
2. Cramer, B.D., Kleffner, M.A., & Saltzman, M.R., 2006. Chemostratigraphic correlation of Lower Silurian deposits in Eastern Iowa: Placing the Llandovery-Wenlock boundary in the mid-continent, in Day, J., Luczaj, J., and Anderson, R., (eds.). New Perspectives and Advances in the Understanding of Lower and Middle Paleozoic Epeiric Carbonate Depositional Systems of the Iowa and Illinois Basins. Guidebook for the 36th Annual Field Conference of the Great Lakes Section, Society for Sedimentary Geology (SEPM), and the 67th Annual Tri-State Field Conference. Iowa Geological Survey Guidebook Series, No. 25, p. 103-109.
1. Cramer, B.D., & Saltzman, M.R., 2005. Sequestration of 12C in the deep ocean during the early Wenlock (Silurian) positive carbon isotope excursion. Palaeogeography, Palaeoclimatology, Palaeoecology, v. 219, p. 333-349. doi: 10.1016/j.palaeo.2005.01.009.