AVO Logo
Site Map | FAQ |
Alaska Volcano Observatory
 
You are here: Home > Samples > UA1126

SAMPLE INFO : UA1126
Sample ID:UA1126
Station ID:Jensen_Palisades_East
Latitude:65.1
Longitude:-153.19997
Datum:NAD83
Sample Type 1:Tephra Fall
Text Description:
Diffuse, discontinuous, gray tephra within inorganic loess 50 to 75 cm below Oct at two measured sections at Site B. Maximum thickness of 0.3 cm. Stratigraphic position relative to SC-F uncertain since they have not been found in the same section. SC-F tentatively placed stratigraphically below P11 because at all sites where it is found, P11 is within 1 m of OCt, while SC-F is generally 2 to 6 m below OCt. Distinct glass morphology, consisting almost entirely of blocky, thick-walled pumice, often elongate, with common microcryts and small, evenly distributed vesicles. Phenocrysts are rare and are dominantly plagioclase with minor amphibole.

References:
The Palisades is a key reference site for the middle Pleistocene of eastern Beringia: new evidence from paleomagnetics and regional tephrostratigraphy

SAMPLE LOCATION

Contact AVO Privacy Accessibility Information Quality FOIA
URL: www.avo.alaska.edu/samples/sample_info.php
Page modified: August 1, 2017 15:29
Contact Information: AVO Web Team

twitter @alaska_avo
facebook alaska.avo
email Receive volcano updates by email: USGS VNS

This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137

Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.