2) The paper I referenced states that the proxy magnetic field intensity derived from sea floor sediment data does not match obital frequencies however other papers state that it does. (realclimate.org)
Pushed by the natural motion of wind and ocean currents — often over long distances — the litter is present in oceans worldwide, as well as in sea floor sediment and coastal sands. (sciencedaily.com)
The conundrum about the relative «iron deficiency» in the tropical oxygen minimum zones was even greater since previous studies had shown that in these regions huge amounts of iron are released in the ocean from anoxic sea floor sediments. (sciencedaily.com)