K–Ar age of the late Pleistocene eruption of Toba, north Sumatra

  title={K–Ar age of the late Pleistocene eruption of Toba, north Sumatra},
  author={Dragoslav Ninkovich and Nicholas John Shackleton and Abdalla A. Abdel-Monem and John D. Obradovich and Glen Arthur Izett},
The late Pleistocene eruption of Toba is the largest magnitude explosive eruption documented from the Quaternary. K–Ar dating of the uppermost unit of the Toba Tuff gives an age of ∼ 75,000 yr. A chemically and petrographically equivalent ash layer in deep-sea cores helps calibrate the Stage 4–5 boundary of the standard oxygen isotope stratigraphy. A similar ash in Malaya that overlies finds of Tampan Palaeolithic tools indicates that they are older than 75,000 yr. 

No short reversals of Brunhes Age recorded in the Toba Tuffs, north Sumatra, Indonesia

Paleomagnetic and 40Ar/39Ar data indicate that two tuffs are present at Siguragura, North Sumatra, Indonesia: a reversely magnetized tuff (the earliest eruptive unit of the Toba caldera) of Matuyama

Tephra records from abyssal sediments off western Sumatra in recent 135 ka: evidence from Core IR-GC1

Three volcanic ash layers were identified in a deep-sea Core IR-GC1 from the north-eastern Indian Ocean, adjacent to western Indonesian arc. They were dominated by glass shards with minor mineral

The discovery of Santorini Minoan tephra in western Turkey

Dispersal of volcanic ash from the violent Bronze Age (Minoan) eruption of the Santorini volcano in the southern Aegean has been the subject of much research1–6. A sediment core taken from a small

First Toba supereruption revival

Little has been known about the earliest Toba eruptive episodes that created the largest-known caldera complex of Quaternary age. Here we report evidence for the eastward dispersal of the oldest Toba

Occurrence of volcanic ash in the Quaternary alluvial deposits, lower Narmada basin, western India

  • R. Raj
  • Environmental Science, Geology
  • 2008
This communication reports the occurrence of an ash layer intercalated within the late Quaternary alluvial succession of the Madhumati River, a tributary of the lower Narmada River. Petrographic,

Pleistocene Climates on Land

  • G. Kukla
  • Environmental Science, Geography
  • 1981
The record of Pleistocene climates on land was pieced together from continuous sedimentary sequences in periglacial areas. It correlates well with the paleoclimatic history reconstructed from the



Globally synchronous extinction of the radiolarian Stylatractus universus

Through comparison of the extinction level of Stylatractus universus with the δO 18 record in widespread high- and low-latitude deep-sea cores, we show that this level is globally synchronous. It


The eruption of vast quantities of acid pumice tuffs stands out as the major event in the initial stages of Quaternary volcanism on Sumatra. By their strict alignment along a trend of longitudinal

North American Glacial History Extended to 75,000 Years Ago

By concentrating carbon-14 through thermal diffusion, it is possible to extend the range of carbon- 14 dating to 75,000 years ago, and a reliable chronology appears possible.

Global synchroneity of late Quaternary coccolith datum levels Validation by oxygen isotopes

The global synchroneity of the Pseudoemiliania lacunosa extinction and the first appearance of Emiliania huxleyi is established by correlation with the oxygen isotope record in seven cores underlying

Pleistocene Site in the Malay Peninsula

IT was to be regretted that until recently no artefacts of Pleistocene age had been found in the Malay Peninsula, and particularly so because of the relationship of the peninsula to the now sunken

A Recent Rhyolite-ash with Sponge-spicules and Diatoms in Malaya

In 1928 the owner of the Tanjong Perak Rubber Estate, Dr. H. Trail Skae, noticed a white, porous, and friable rock near the Estate buildings and took specimens that were ultimately sent to the