Üvegleletek egy 12–13. századi település területéről (Orosháza-Bónum, Faluhely)

Archaeometric investigations have been carried out on two glass fragments found in a 12th–13th century settlement (near orosháza, hungary), where supposedly islamic inhabitants lived. the identical texture and the fairly close chemical compositions of the glassy materials indicate that the two pieces might belong to one vessel or the two vessels were made in the same workshop. the glass chemistry (soda plant ash) fits well both contemporary islamic and venetian glasses. the form of one of the vessels (biconical, or bottle with body-tubular ring) is a well-known venetian type, but it was known in the islamic world as well. the probably origin of the studied glass is that they were made in the venetian glassmaking centre from levantine raw glass, but the islamic provenience cannot be excluded.

Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, USA

Holocene tephrostratigraphy in Alaska provides independent chronology and stratigraphic correlation in a region where reworked old (Holocene) organic carbon can significantly distort radiocarbon chronologies. Here, we present new glass chemistry and chronology for Holocene tephras preserved in three Alaskan lakes: one in the eastern interior and two in the southern Brooks Range. Tephra beds in the eastern interior lake-sediment core are correlated with the White River Ash and the Hayes tephra set H (~4200–3700 cal yr BP), and an additional discrete tephra bed is likely from the Aleutian arc/Alaska Peninsula. Cryptotephras (nonvisible tephras) found in the Brooks Range include the informally named “Ruppert tephra” (~2700–2300 cal yr BP) and the Aniakchak caldera-forming event II (CFE II) tephra (~3600 cal yr BP). A third underlying Brooks Range cryptotephra is chemically indistinguishable from the Aniakchak CFE II tephra (4070–3760 cal yr BP) and is likely to be from an earlier eruption of the Aniakchak volcano.