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SAMPLE INFO : 2_64-14_32
Sample ID:2_64-14_32
Station ID:Nayudu_core_2
Latitude:51.95138004
Longitude:-143.2369872
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Sample ID is the core number_cruise-and-sample-number_length (cm) from Table 1 in Nayudu (1964), which contains the list of the cores containing volcanic ash, their position, depth and length. Depth of 2,020 fathoms. Andesitic ash layer occurs from 28-31.5 cm within this core. This ash layer occurs within foraminifera-rich sediments and is characterized by high glass content and consists of about 10-15% minerals and crystals. Refractive index of the vitric glass shards is 1.505 +/- 0.002. The shards are triangular, plate-like or irregular in shape, with inclusions of oval-shaped bubble. The ash is older than 25,800 +/- 1,300 years and younger than 30,000 years.

References:
Volcanic ash deposits in the Gulf of Alaska and problems of correlation of deep-sea ash deposits

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Page modified: August 1, 2017 15:29
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