Late Tertiary planktonic foraminifera associated with a basaltic boulder from the mid-Atlantic Ridge
A dredge haul obtained from the mid-Atlantic Ridge at 22° 56' N, 46° 35' W yielded a consolidated, partially silicified foraminiferal ooze and some frag ments of an apparently altered basalt. The age of the consolidated ooze, determined from its assemblage of planktonic Foraminifera, is late Tertiary and probably late Miocene. The inference is that deposition of the consolidated ooze preceded the extrusion of the basalt, with silicification of the ooze occurring during the periods of extrusion and alteration of the basalt.
Cifelli, Richard. 1965. "Late Tertiary planktonic foraminifera associated with a basaltic boulder from the mid-Atlantic Ridge." Journal of Marine Research 23, (2). https://elischolar.library.yale.edu/journal_of_marine_research/1046