Benthic foraminiferal assemblages and paleoproductivity reconstructions for the last 550 kyr of the Ontong Java Plateau, western equatorial Pacific

We analyzed foraminiferal and nannofossil assemblages and stable isotopes in samples from ODP Hole 807A on the Ontong Java Plateau in order to evaluate productivity and carbonate dissolution cycles over the last 550 kyr (kilo year) in the western equatorial Pacific. Our results indicate that productivity was generally higher in glacials than during interglacials, and gradually increased since MIS 13. Carbonate dissolution was weak in deglacial intervals, but often reached a maximum during interglacial to glacial transitions. Carbonate cycles in the western equatorial Pacific were mainly influenced by changes of deep-water properties rather than by local primary productivity. Fluctuations of the estimated thermocline depth were not related to glacial to interglacial alternations, but changed distinctly at ~280 kyr. Before that time the thermocline was relatively shallow and its depth fluctuated at a comparatively high amplitude and low frequency. After 280 kyr, the thermocline was deeper, and its fluctuations were at lower amplitude and higher frequency. These different patterns in productivity and thermocline variability suggest that thermocline dynamics probably were not a controlling factor of biological productivity in the western equatorial Pacific Ocean. In this region, upwelling, the influx of cool, nutrient-rich waters from the eastern equatorial Pacific or of fresh waters from rivers have probably never been important, and their influence on productivity has been negligible over the studied period. Variations in the inferred productivity in general are well correlated with fluctuations in the eolian flux as recorded in the northwestern Pacific, a proxy for the late Quaternary history of the central East Asian dust flux into the Pacific. Therefore, we suggest that the dust flux from the central East Asian continent may have been an important driver of productivity in the western Pacific.

Construction of a precise early Eocene orbital cyclostratigraphy for DSDP Site 80-550 from the Goban Spur, North Atlantic

We constructed a precise early Eocene orbital cyclostratigraphy for DSDP Site 550 (Leg 80, Goban Spur, North Atlantic) utilizing precession related cycles as represented in a high resolution X-Ray Fluorescence based Barium core log. Based on counting of those cycles, we constrain the exact timing of two volcanic ash layers in Site 550 which correlate to ashes +19 and -17 of the Fur Formation in Denmark. The ashes, relative to the onset of the Paleocene/Eocene Thermal Maximum (PETM), are offset by 862 kyr and 672 kyr, respectively. When combined with published absolute ages for ash -17, the absolute age for the onset of the PETM is consistent with astronomically calibrated ages. Using the current absolute age of 28.02 Ma for the Fish Canyon Tuff (FCT) standard for calibrating the absolute age of ash -17 is consistent with tuning option 2 in the astronomically calibrated Paleocene time scale of Westerhold et al. (2008) [Westerhold, T., Röhl, U., Raffi, I., Fornaciari, E., Monechi, S., Reale, V., Bowles, J., and Evans, H.F., 2008, Astronomical calibration of the Paleocene time: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 257, p. 377-403]. Using the recently recalibrated absolute age of 28.201 Ma for the FCT standard is consistent with tuning option 3 in the astronomically calibrated Paleocene time scale. The new results do not support the existence of any additional 405-kyr cycle in the early Paleocene astronomically tuned time scale.

Icones opervm misericordiae cvm Ivlii Roscii Hortini sententiis et explicationibvs : pars prior eorvm qvae ad corpvs pertinent.

Numbers 53-54 omitted in paging.

Nova plantarum genera iuxta Tournefortii methodum disposita quibus plantae 1900 recensentur, scilicet fere 1400 nondum observatae, reliquae suis sedibus restitutae; quarum vero figuram exhibere visum fuit, eae ad 550 aeneis tabulis 108 graphice expressae sunt; adnotationibus, atque observationibus, praecipue fungorum, mucorum, affiniumque plantarum sationem, ortum, [€t] incrementum spectantibus, interdum adiectis .../

Mode of access: Internet.

De situ orbis libri tres cvm Petri Ioannis Oliuarii Valentini, uiri in Geographia doctissimi, scholiis. Hermolai Barbari in evndem Pomponivm Melam, castigationes. C. Ivlii Solini Polyhistor, sive rervm orbis memorabilium collectanea...

Mode of access: Internet.

Standards of good engineering practice concerning standard broadcast stations (550-1600 ke.) effective August 1, 1939 (revised to October 30, #)

Mode of access: Internet.

EPA 550/9.

Description based on: 74-001.

Samvelis Gvstavi Wilcke ... Hortvs gryphicvs : exhibens plantas, prima eivs constitvtione illatas et altas vna cvm Horti historia.

Includes index.

Notitia Sveviae antiqvae, ortvm et progressvm svevorvm ad tempora infelicis cvm Francis ad Tolbiacvm commissi proelii exhibens ...

Mode of access: Internet.

Anthologia graeca epigrammatym palatina cvm Planvdea, edidit Hvgo Stadtmveller ...

Mode of access: Internet.

Macrizi Historia regvm Islamiticorvm in Abyssinia. Interpretatvs est et vna cvm Abvlfedae Descriptione regionvm nigritarvm e codd.

Text of al-Maqrīzī's Ilmām bi-akhbār man bi-arḍ al-Ḥabashah min mulūk al-Islām in Latin and Arabic; selections from Abulfeda's Taqwīm al-buldān in Arabic.