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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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East Africa
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Kenya
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Lake Magadi (1)
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Lake Turkana (1)
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Tanzania
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Olduvai Gorge (1)
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East African Lakes
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Lake Magadi (1)
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Lake Turkana (1)
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Limpopo Basin (1)
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Namib Desert (1)
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North Africa (1)
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Sahara (1)
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Southern Africa
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Namibia (1)
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South Africa
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Western Cape Province South Africa (1)
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Altiplano (2)
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Antarctica
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Asia
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Japan
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Invertebrata
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Insecta
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Primary terms
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Africa
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Tanzania
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upper Quaternary
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Tertiary
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Insecta
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isotopes
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stable isotopes
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Mesozoic
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Leg 132
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Leg 160
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ODP Site 964 (1)
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Leg 161
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ODP Site 977 (1)
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Leg 162
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insolation
Winter weathering of fractured sedimentary rocks in a temperate climate: observation of freeze–thaw and thermal processes on the Niagara Escarpment, Hamilton, Ontario
Dominant precessional forcing of the East Asian summer monsoon since 260 ka
Climate-Driven Changes in High-Intensity Wildfire on Orbital Timescales in Eurasia since 320 ka
New Grain Size and Petromagnetic Records from Lacustrine Sediments in the South of Southwestern East Siberia: Application for the Reconstruction of the Regional Environment in the Late Glacial and Holocene
Monthly insolation linked to the time-transgressive nature of the Holocene East Asian monsoon precipitation maximum
South African speleothems reveal influence of high- and low-latitude forcing over the past 113.5 k.y.
Temperature change in subtropical southeastern Africa during the past 790,000 yr
The Goldilocks Planet? How Silicate Weathering Maintains Earth “Just Right”
Orbital controls on Namib Desert hydroclimate over the past 50,000 years
Coupling of the Intertropical Convergence Zone and Southern Hemisphere mid-latitude climate during the early to mid-Holocene
Past changes in the North Atlantic storm track driven by insolation and sea-ice forcing
Deciphering the role of solar-induced thermal stresses in rock weathering
New results on the Earth insolation and their correlation with the Late Pleistocene paleoclimate of West Siberia
We studied a high-resolution multiproxy data set, including magnetic susceptibility (MS), CaCO 3 content, and stable isotopes (δ 18 O and δ 13 C), from the stratigraphic interval covering the uppermost Maastrichtian and the lower Danian, represented by the pelagic limestones of the Scaglia Rossa Formation continuously exposed in the classic sections of the Bottaccione Gorge and the Contessa Highway near Gubbio, Italy. Variations in all the proxy series are periodic and reflect astronomically forced climate changes (i.e., Milankovitch cycles). In particular, the MS proxy reflects variations in the terrigenous dust input in this pelagic, deep-marine environment. We speculate that the dust is mainly eolian in origin and that the availability and transport of dust are influenced by variations in the vegetation cover on the Maastrichtian-Paleocene African or Asian zone, which were respectively located at tropical to subtropical latitudes to the south or far to the east of the western Tethyan Umbria-Marche Basin, and were characterized by monsoonal circulation. The dynamics of monsoonal circulation are known to be strongly dependent on precession-driven and obliquity-driven changes in insolation. We propose that a threshold mechanism in the vegetation coverage may explain eccentricity-related periodicities in the terrigenous eolian dust input. Other mechanisms, both oceanic and terrestrial, that depend on the precession amplitude modulated by eccentricity, can be evoked together with the variation of dust influx in the western Tethys to explain the detected eccentricity periodicity in the δ 13 C record. Our interpretations of the δ 18 O and MS records suggest a warming event ~400 k.y. prior to the Cretaceous-Paleogene (K-Pg) boundary, and a period of climatic and environmental instability in the earliest Danian. Based on these multiproxy phase relationships, we propose an astronomical tuning for these sections; this leads us to an estimate of the timing and duration of several late Maastrichtian and Danian biostratigraphic and magnetostratigraphic events.