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Institute of Earth Sciences Friday Seminar - Brent Alloway - Tracing the Footsteps of Southeast Asia's Earliest Hominins Using Tephrochronology

13. október 2017 12:30 til 13:30


3rd Floor Meeting Room

Aðgangur ókeypis

This Friday we have:

Brent Alloway (University of Auckland, NZ/University of Wollongong, Australia)

Title: No small feet - Tracing the Footsteps of Southeast Asia's Earliest Hominins Using Tephrochronology 

Date: Friday, 13th October

Time: 12:30

Place: 3rd Floor meeting room, Askja


In 2003, a spectacular discovery of a new hominin species (Homo floresiensis; popularly dubbed ‘Hobbits’) was made on the eastern Indonesian island of Flores by a team of Australian and Indonesian archaeologists. While initial pathological explanations have been dismissed, debate still rages over the origin and placement of H. floresiensis in the human family tree. Thus, there are many lingering questions about the timing and impact of successive hominin colonizations in the region. Who were the first hominins to reach Flores and how and why did H. floresiensis get so small? Ongoing research in Flores is currently concentrated in two main areas (i) Liang Bua Cave – the site of the original 2003 Hobbit discovery, and (ii) the Soa Basin in central Flores, where stone artefacts and vertebrate faunal changes have been identified in volcaniclastic and fluvio-lacustrine deposits spanning between c. 1 million to 650,000 years ago.

Flores, located immediately northward of the geologically active Sunda-Banda Arc, has 14 active volcanoes that have generated multiple and widespread silicic tephra horizons, which are now recognized as being spatially and temporally associated with fossil and artefact-bearing sequences. Tephrostratigraphy supported by major (electron microprobe) and trace element (LA-ICP-MS) geochemistry of glass shards as well as radiometric ages (i.e. Ar/Ar, ITPFT, (U-Th-Sm)/He) of interbedded volcaniclastic deposits, is designed to 1) permit correlation of equivalent-aged sequences, allowing for the identification of prospective hominin-bearing sites; 2) clarify the environment inhabited by hominins; and 3) determine the role of eruptive activity on the pattern of faunal extinctions and extirpations on Flores. Ultimately, an important objective is to use inter-regional silicic tephra markers to link equivalent-aged hominin (and tephra) bearing records from Flores with those from central Java that contain Homo erectus and thus resolve debates about the chronological relationships between the “Hobbit”, its putative ancestor and H. erectus.

All are welcome.