The vegetation of Tertiary islands on the Ninetyeast Ridge

Author(s): Kemp, E. M.; Harris, W. K.
Volume Title: Nature (London)
Source: Nature (London), 258(5533), p.303-307. Publisher: Macmillan Journals, London, United Kingdom. ISSN: 0028-0836 CODEN: NATUAS
Note: In English. Pollen-rich sediments, species list, long-range dispersal, biogeography, continental drift; Paleocene, Oligocene, Indian Ocean; illus. incl. table, sketch maps
Summary: This paper documents the occurrence of pollen-rich sediments from drill sites on the Ninetyeast Ridge that flourished in the Palaeocene and Oligocene, and discusses the floristic composition of the vegetation they reflect, the dispersal problems faced by the island floras, and the influence on them of former distributions of land and sea areas. The plant microfossil assemblages indicate that the vegetation of these islands had much in common with the early Tertiary vegetation of Australia, New Zealand, southernmost South America, and Antarctica. Pollen of Myrtaceae, Restionaceae, Proteaceae, and that of Podocarpaceae and Araucariaceae occur in quantities that are not suggestive of a wind-blown origin. Geological considerations dictate that establishment at these sites must have involved dispersal across significant ocean gaps, so that these groups may not always have lacked vagility. It further suggests that their current absence from southern oceanic islands, i.e., Amsterdam, St. Paul, and Kerguelen, reflects the recent environmental history of those islands, all of which have been subjected to late Neogene chilling.
Year of Publication: 1975
Research Program: DSDP Deep Sea Drilling Project
Key Words: 09 Paleontology, Paleobotany; Affinities; Angiospermae; Assemblages; Biogeography; Cenozoic; Continental drift; Cores; DSDP Site 214; DSDP Site 254; Deep Sea Drilling Project; Deep sea; Dispersal; Diversity; Gymnospermae; Indian Ocean; Islands; Leg 22; Leg 26; Lower Tertiary; Microfossils; Miospores; Ninetyeast Ridge; Oligocene; Paleobotany; Paleocene; Paleogene; Palynomorphs; Plantae; Pollen; Spermatophyta; Tertiary; Transport; Vegetation
Coordinates: S112013 S112013 E0884305 E0884305
S305809 S305809 E0875343 E0875343
Record ID: 1976013788
Copyright Information: GeoRef, Copyright 2017 American Geosciences Institute. Reference includes data from the Antarctic Bibliography, United States