Richey, J. D., Upchurch, G., Montañez, I. P., Lomax, B. H., Suarez, M. B., Crout, N. M., …Smith, J. J. (2018). Changes in CO2 during ocean anoxic event 1d indicate similarities to other carbon cycle perturbations. Earth and Planetary Science Letters, 491, https://doi.org/10.1016/j.epsl.2018.03.035