Calcareous nannofossil abundance and datums of ODP Leg 189 sites

Quaternary sediments were recovered at all five sites drilled during Ocean Drilling Program (ODP) Leg 189 in the Tasmanian Gateway. Two of these sites lie north of the present-day Subtropical Front (STF), and three sites lie south of the STF. Quaternary sediments recovered at Sites 1168, 1170, 1171, and 1172 were studied in detail to determine the calcareous nannofossil biostratigraphy and construct an age model for these sediments. The Pliocene/Pleistocene boundary was identified by the last occurrence (LO) of Discoaster brouweri at Site 1172 and approximated by the LO of Calcidiscus macintyrei at the other sites because of a lack of discoasterids. A hiatus encompassing the entire Helicosphaera sellii Zone was tentatively identified at Sites 1168 and 1172 by the coincident LOs of C. macintyrei and H. sellii. Similar hiatuses have been noted at ODP Site 1127 on the Great Australian Bight, Deep Sea Drilling Project Site 282 off the Tasman subcontinent, and ODP Site 1165 in Prydz Bay, Antarctica.

X-ray fluorescence scannings, diatoms, and dinocyst of ODP Site 189-1172

Eocene sediments drilled at the East Tasman Plateau (ETP) exhibit well-defined cycles, high-resolution magnetic stratigraphy, and environmentally-controlled dinoflagellate and diatom distribution patterns. We derive a cyclostratigraphy from the spectral analysis of high-resolution elemental concentration records (Ca, Fe) for this shallow marine time series spanning the middle to early late Eocene (C16n.2n - C21). Changes in carbonate content, the ratio between Gonyaulacoid and Peridinioid dinocysts, and relative abundance of "oligotrophic" diatoms serve as proxies for a high-resolution climatic and sea-level history with high values representing high sea-level stands and decreased eutrophy of surface waters. Changing ratios between high latitude dinocysts versus cosmopolitan species provide clues on sea surface temperature trends and water mass exchange. Our results show that the relatively shallow-water middle Eocene environments of the ETP are influenced by orbitally-forced climatic cycles superimposed on third order relative sea-level changes. Changes in the dominance of Milankovitch frequency at ~38.6 Ma (late Eocene) is related to an initial deepening-step within the Tasmanian Gateway prior to the major deepening during the middle late Eocene (~35.5 Ma). Decreasing sedimentation rates at 38 Ma and 37.2 Ma reflect winnowing associated with sea-level fall. This episode is followed by renewed transgression. Dinocyst distribution patterns indicate high latitude, probably cool temperate surface water conditions throughout, with the exception of a sudden surge in cosmopolitan species near the base of subchron C18.2r, at ~41 Ma; this event is tentatively correlated to the Middle Eocene Climatic Optimum.

Classified information nondisclosure agreement (SF-189) /

"July 1985."

Histoire généalogique de la maison de L'Esperonnière : de ses alliances et des seigneuries qu'elle a possédées: Anjou, Poitou, Bretagne et Maine, 1156-189, d'après les archives inédites du Chateau de la Saulay (Maine-et-Loire) et les documents conservés dans les dépots publics.

Mode of access: Internet.

Organizational maintenance repair parts and special tools lists : tractor, wheeled, warehouse, gasoline engine driven; pneumatic tired, 4000 lb. drawbar pull Army models MHE 189, MHE 189A, and MHE 189B, NSN 3930-00-724-8146, United Tractor models G40, G40A, and G40B.

Includes index.

DS, GS, and depot maintenance manual : tractor, wheeled, warehouse, gasoline, pneumatic-tired wheels, 4,000-pound drawbar pull, Army model MHE-189, United tractor model G40, FSN 3930-724-8146.

"January 1965."

Operator's manual : tractor, wheeled, warehouse, gasoline, pneumatic-tired wheels, 4000-pound drawbar pull, Army model MHE-189, United Tractor model G40, FSN 3930-724-8146.

"December 1964."

Operator, organizational, DS, GS, and depot maintenance manual including repair parts and special tools list : handset H-189/GR.

"October 1966."

Operator and organizational maintenance manual : tank, fabric, collapsible, POL, 3,000 gallon (11,355 liter), NSN 5430-00-268-8187, 10,000 gallon (37,850 liter), NSN 5430-00-052-3412, 10,000 gallons (37,850 liter), NSN 5430-00-641-8552), 50,000 gallon (189,250 liter), NSN 5430-00-182-8181.

"30 November 1978."