An abundant diatomaceous flora was observed in shallow waters along the coasts of French Guiana and Dutch Guiana during the fall of 1964 and the spring of 1965. In the fall, these diatoms were apparently carried far beyond the continental shelf by the Amazon effluent, which crossed the northwestward Guiana Current and became entrained in a southeastward countercurrent....
Hulburt, E. M., and Nathaniel Corwin. 1969. "Influence of the Amazon River outflow on the ecology of the western tropical Atlantic. III. The planktonic flora between the Amazon River and the Windward Island." Journal of Marine Research 27, (1). https://elischolar.library.yale.edu/journal_of_marine_research/1143