Dendrochronology (Henri Grissino-Mayer)

a) Sample identifier (Dendro-Lab Key-code): ELMA3410/CER118B, ELMA3468/CER113A
b) Sample certainly derives from a single tree (Y/N): Y
c) Site: El Malpais National Monument, New Mexico, USA
d) Object type: Sub-fossil log
e) Preservation: Dry
f) Sample type (e.g. core or slice): cross section
g) Species: Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco
h) No of rings: 529 (ELMA3410/CER118B), 397 (ELMA3468/CER113A)
i) Pith (Y/N): N
j) Waney edge: N
k) Bark (Y/N): N
l) Sapwood (Y/N): N
m) Methodology used for dating: Graphically = skeleton plot method; Statistical verification through COFECHA.

n) We dated the series using COFECHA (Version 6.06P). Crossdating was a two-step verification process. First, I attempt to date each series against other series from the site, once an overlap in years is suggested by the skeleton plot and by COFECHA, the series is then added to the master ELMA data set. All crossdating metrics must indicate with a high degree of statistical certainty (p < 0.0001) that the sample is indeed crossdated in its exact temporal position. Secondly, once all series are included in the master data set for ELMA, a chronology was created for the site and compared to nearby tree-ring chronologies that were developed from archaeological sites throughout the American Southwest. This process is given in detail in my dissertation and in the subsequent peer-reviewed publication:

H.D. Grissino-Mayer, 1995. Tree-Ring Reconstructions of Climate and Fire History at El Malpais National Monument, New Mexico. Ph.D. dissertation, The University of Arizona, Tucson. 407 pp.

H.D. Grissino-Mayer, 1996. A 2129 Year Reconstruction of Precipitation for Northwestern New Mexico, USA. Pages 191–204 in J.S. Dean, D.M. Meko, and T.W. Swetnam, eds., Tree Rings, Environment, and Humanity. Radiocarbon 1996, The University of Arizona Press: Tucson.

Dated individually (Y/N): Y
Intra-site/phase cross-matching with (Lab-Keycodes, relative positions, Mean curve identifier):
NONE

o) Raw ring width series attached

Publicly deposited (Y/N): Yes. Archived in the International Tree-Ring Data Bank as dataset NM572.rwl

p) Remainder of sample is stored in which archive?
Laboratory of Tree-Ring Research, The University of Arizona, Tucson, Arizona, 85721.

Correlations of 50-year dated segments, lagged 25 years
Flags: A = correlation under .3281 but highest as dated; B = correlation higher at other than dated position

Seq Series Time_span 350 375 400 425 450 475 500 525 550 575 600 625 650 675 700 725 750 775 800 825
399 424 449 474 499 524 549 574 599 624 649 674 699 724 749 774 799 824 849 874
--- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
108 CRE118B 667 1195 .76 .76 .81 .85 .80 .85 .87 .77


Seq Series Time_span 850 875 900 925 950 975 1000 1025 1050 1075 1100 1125 1150 1175 1200 1225 1250 1275 1300 1325
899 924 949 974 999 1024 1049 1074 1099 1124 1149 1174 1199 1224 1249 1274 1299 1324 1349 1374
--- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
108 CRE118B 667 1195 .72 .82 .90 .89 .85 .79 .81 .85 .88 .87 .85 .91 .94


Corr //-------- Unfiltered --------\\ //---- Filtered -----\\
No. No. No. with Mean Max Std Auto Mean Max Std Auto AR
Seq Series Interval Years Segmt Flags Master msmt msmt dev corr sens value dev corr ()
--- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- --
108 CRE118B 667 1195 529 21 0 .840 .49 2.81 .353 .555 .484 2.71 .369 -.023 2


Correlations of 50-year dated segments, lagged 25 years
Flags: A = correlation under .3281 but highest as dated; B = correlation higher at other than dated position

Seq Series Time_span 350 375 400 425 450 475 500 525 550 575 600 625 650 675 700 725 750 775 800 825
399 424 449 474 499 524 549 574 599 624 649 674 699 724 749 774 799 824 849 874
--- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
101 CRE113A 818 1214 .81 .84


Seq Series Time_span 850 875 900 925 950 975 1000 1025 1050 1075 1100 1125 1150 1175 1200 1225 1250 1275 1300 1325
899 924 949 974 999 1024 1049 1074 1099 1124 1149 1174 1199 1224 1249 1274 1299 1324 1349 1374
--- -------- --------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
101 CRE113A 818 1214 .80 .85 .86 .85 .85 .82 .80 .81 .75 .73 .76 .83 .78 .7

Corr //-------- Unfiltered --------\\ //---- Filtered -----\\
No. No. No. with Mean Max Std Auto Mean Max Std Auto AR
Seq Series Interval Years Segmt Flags Master msmt msmt dev corr sens value dev corr ()
--- -------- --------- ----- ----- ----- ------ ----- ----- ----- ----- ----- ----- ----- ----- --
101 CRE113A 818 1214 397 16 0 .795 .73 2.15 .321 .399 .386 2.68 .420 .001 2