Alaska Volcano Observatory - The Dawson Cut Forest Bed in the Fairbanks area, Alaska, is about two million years old

THE DAWSON CUT FOREST BED IN THE FAIRBANKS AREA, ALASKA, IS ABOUT TWO MILLION YEARS OLD

Westgate, J. A., Preece, S. J., and Pewe, T. L., 2003, The Dawson Cut Forest Bed in the Fairbanks area, Alaska, is about two million years old: in Westgate, J. A., (ed.), Special issue dedicated to Troy Pewe, Quaternary Research, v. 60, n. 1, p. 2-8.

DATA TABLES *Not all tables in a publication may be listed. Not all tables from a publication have data entered in the database.

4261: Composition of glass shards in tephra beds in the Dawson Cut Forest Bed and Gold Hill Loess, Fairbanks, Alaska

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* Notes. Glass analyses (wt. %) for UA351, UT497, UT1280, UT1281 were done in a single run using a Cameca SX-50 wave-length dispersive electron microprobe. Operating conditions were 15 keV accelerating voltage, 10–15 micron beam diameter, and 6 nA beam current. Other glass analyses * (UT497, UA355, UA352, UA353, UA360) determined on an ETEC Autoprobe fitted with an Ortec Si(Li) detector. Microprobe operated at 20 keV with a beam current set to give 3000 counts per second on willemite; sample current about 0.23 nA, counting time 100 s. Data reduction by modified version of PESTRIPS. MgO and MnO values assumed from Cameca analyses; unnormalized values added to unnormalized ETEC data and then analyses normalized. All analyses recast to 100% on a water-free basis; mean and one standard deviation (in brackets) given. FeOt = total iron oxide as FeO; H2Od = water, by difference; n = number of analyses. Accuracy of analyses monitored against glass standard UA5831. Individual analyses are given in Table S1, which is available as supplementary data on IDEAL website. *

SAMPLES

UT1280
UT1281
Westgate_2003_PAL_tephra_average
UA353
UA360
UA352
UA351
UT1104
UT892
UT962
UT738
UT873
UT1098
UT497
UA355

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