Supplementary Materials for...May 24, 2018 · fig. S3. Normal kernel density estimates of 10Be...
Transcript of Supplementary Materials for...May 24, 2018 · fig. S3. Normal kernel density estimates of 10Be...
advances.sciencemag.org/cgi/content/full/4/5/eaar5040/DC1
Supplementary Materials for
Deglaciation of the Pacific coastal corridor directly preceded the human
colonization of the Americas
Alia J. Lesnek, Jason P. Briner, Charlotte Lindqvist, James F. Baichtal, Timothy H. Heaton
Published 30 May 2018, Sci. Adv. 4, eaar5040 (2018)
DOI: 10.1126/sciadv.aar5040
This PDF file includes:
fig. S1. Map of southeastern Alaska with labeled islands.
fig. S2. Representative boulder and bedrock samples collected for 10Be dating.
fig. S3. Normal kernel density estimates of 10Be ages.
fig. S4. Fossilized mammal bone 14C ages from caves in southeastern Alaska.
fig. S5. Box-and-whisker plot of fossilized cave bone δ13C values from Prince of
Wales Island.
fig. S6. Sensitivity testing of the fossilized cave bone 14C age calibration.
fig. S7. Fossilized cave bone δ13C values and marine carbon percentages through
time.
table S1. 10Be sample information.
table S2. 10Be ages calculated with alternative production rates and scaling
schemes.
table S3. Fossilized cave bone sample information used for 14C calibration.
Reference (66)
fig. S1. Map of southeastern Alaska with labeled islands. Shuká Káa on Prince of
Wales Island is denoted by the orange star.
fig. S2. Representative boulder and bedrock samples collected for 10Be dating. (A-
B) Bedrock samples from Dall Island. (C) Perched boulder from Suemez Island. (D)
Bedrock sample from the abraded surface of a rôche moutonée at Suemez Island. (E-F)
Perched boulders from a cirque on Baker Island. (G) Bedrock sample from Warren
Island. The old apparent 10Be age of this sample is due to cosmogenic nuclide
inheritance from previous exposure. (H) Perched boulder sample from Warren Island.
fig. S3. Normal kernel density estimates of 10Be ages. In both panels, individual 10Be
ages are represented by the gray lines and the thicker black line represents the
summed probability distribution of the entire 10Be age population. (A) 10Be ages from a
cirque on Baker Island. Average excludes one outlier from a bedrock surface (15SEAK-
11; 17.0 ± 0.7 ka) that is >3 SD older than the remaining three 10Be ages. (B) 10Be ages
from perched boulders and bedrock at Dall, Suemez, and Warren Islands. Average age
excludes one outlier from a bedrock surface (17SEAK-12; 24.8 ± 1.0 ka) that is >3 SD
older than the remaining nine 10Be ages.
fig. S4. Fossilized mammal bone 14C ages from caves in southeastern Alaska. (A)
Summed probability distribution of all ages. Dark green line = Shuká Káa; light green
line = all other caves. (B) Fossilized mammal bones by species. Dots represent the
mean of the total range of each calibrated 14C age. Vertical gray bar denotes the timing
of maximum CIS extent in southeastern Alaska.
Cal ka BP
fig. S5. Box-and-whisker plot of fossilized cave bone δ13C values from Prince of Wales Island. Fossils are grouped
by species. White boxes show the Q1-Q3 interquartile range, and the horizontal black line in each box denotes the
median. Black circles represent the average δ13C value for each species, and white circles denote outliers which have
δ13C values exceeding 1.5 times the Q1-Q3 interquartile range from the median. Blue shading shows the divisions
between various percentages of marine carbon used for the 14C age calibration.
fig. S6. Sensitivity testing of the fossilized cave bone 14C age calibration. Under
multiple calibration schemes, a hiatus in fossil 14C ages (blue arrow) appears from ~20-
17 ka.
Cal ka BP
20.17 ± 0.59 to 17.36 ± 1.20 cal ka BP
19.80 ± 0.60 to 16.62 ± 1.29 cal ka BP
20.18 ± 0.59 to 17.1 ± 1.23 cal ka BP
fig. S7. Fossilized cave bone δ13C values and marine carbon percentages through
time. Blue dots = 100% marine carbon; teal dots = 50% marine; green dots = 0%
marine. Hiatus in fossil ages from ~20-17 ka, which is interpreted as CIS cover of the
Alexander Archipelago, is indicated by the gray bar.
Age (cal ka BP)
table S1. 10Be sample information.
table S2. 10Be ages calculated with alternative production rates and scaling schemes.
table S3. Fossilized cave bone sample information used for 14C calibration.
table S3, continued
table S3, continued
table S3, continued