Ecological Archives E087-100-A1

Daniel G. Gavin, Feng Sheng Hu, Kenneth Lertzman, and Peter Corbett. 2006. Weak climatic control of stand-scale fire history during the late Holocene. Ecology 87:1722–1732.

Appendix A. Radiocarbon dates and volcanic tephras with known ages from the Cooley Lake and Rockslide Lake sediment cores.

TABLE A1. Accelerator mass spectrometry (AMS) radiocarbon dates on plant macrofossils and volcanic tephras with known ages from the Cooley Lake and Rockslide Lake sediment cores. Tephra identifications and radiocarbon dates were previously published in Foit et al. (2004).

Depth (cm)

Laboratory number or tephraa

14C age

Calibrated age (cal. yr BP)b

Cooley Lake

50.5-51.3

St. Helens Wn

-

468c

95.0-95.5

Beta-157960

1590±50

1350-1570

171.0-172.0

CAMS-95388

2530±45

2470-2750

199.0-200.0

CAMS-85222

3010±60

3060-3350

326.0-327.0

CAMS-85223

5195±40

5900-6000

> 377.0

Mazama O

-

7627d

Rockslide Lake

22.0-22.7

St. Helens Wn

-

468c

62.0-62.5

CAMS-97111

1970±35

1860-1990

92.0-93.0

St. Helens P

-

2620e

128.5-129.0

CAMS-97112

3360±40

3470-3690

168.0-168.5

CAMS-97113

3870±60

4140-4420

202.0-202.5

CAMS-98368

4420±45

4870-5280

> 221.0

Mazama O

-

7627d

aBeta=Beta Analytic, Inc.; CAMS=Center for Accelerator Mass Spectrometry, Lawrence Livermore National Laboratory. Tephra names in italics.

bMinimum and maximum of 2 SD age ranges only, rounded to nearest decade. Calibration follows Stuiver and Reimer 1993 (Rev 4.4) and Stuiver et al. 1998.

cFrom Yamaguchi (1983).

dFrom Zdanowicz et al. (1999).

eFrom correlation with Cooley Lake; Foit et al. (2004).

LITERATURE CITED

Foit, F. F., D. G. Gavin, and F. S. Hu. 2004. The tephra stratigraphy of two lakes in South-central British Columbia, Canada and its implications for the mid-late Holocene volcanic activity at Glacier Peak, Washington, USA. Canadian Journal of Earth Sciences 41:1401–1410.

Stuiver, M., and P. J. Reimer. 1993. Extended 14C database and revised CALIB radiocarbon calibration program. Radiocarbon 35:215–230.

Stuiver, M., P. J. Reimer, E. Bard, J. W. Beck, G. S. Burr, K. A. Hughen, B. Kromer, G. McCormac, J. Van der Plicht, and M. Spurk. 1998. INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Radiocarbon 40:1041–1083.

Yamaguchi, D. K. 1983. New tree-ring dates for recent eruptions of Mount St Helens. Quaternary Research 20:246–250.

Zdanowicz, C. M., G. A. Zielinski, and M. S. Germani. 1999. Mount Mazama eruption: Calendrical age verified and atmospheric impact assessed. Geology 27:621–624.



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