Bradtmiller, L. I., Anderson, R. F., Fleisher, M. Q., & Burckle, L. H. (2007). Opal burial in the equatorial Atlantic Ocean over the last 30 ka: Implications for glacial‐interglacial changes in the ocean silicon cycle. Paleoceanography, 22(4). Portico. https://doi.org/10.1029/2007pa001443