COMPLETE DIATOM DATA USED IN OVERPECK ET AL.'S SCIENCE PAPER (compiled by APW) ELISON LAKE, Cape Hershel, Ellesmere Island (Marianne Douglas) 210-Pb Diatoms: relative frequencies depth (cm) (Bq/g) Fragilaria pinnata Fragilaria pinnata var. subrotunda Fragilaria pinnata var. intercedens Fragilaria construens var. venter other and unidentified Fragilaria spp. all Cymbella spp. Navicula contenta and var. biceps (Diadesmis spp.) Nitzschia spp. Pinnularia balfouriana all other diatom taxa 1.00 0.03976 3.53 0.44 0.00 1.55 0.22 1.55 0.44 1.77 82.12 8.39 2.00 0.02373 2.53 0.00 0.25 0.25 0.51 1.52 0.51 0.00 89.65 4.80 3.00 0.0187 41.01 0.00 7.19 23.74 0.00 0.00 0.72 0.00 18.71 8.63 4.00 0.0177 diatoms not counted 5.00 0.01574 44.23 3.85 6.73 28.85 1.92 0.96 0.96 1.92 7.69 2.88 6.00 0.01585 diatoms not counted 7.00 no data 52.80 0.00 3.20 32.00 0.00 0.00 0.80 3.20 8.00 0.00 8.00 0.01691 diatoms not counted 9.00 no data 60.00 2.00 15.00 19.00 0.00 0.00 2.00 0.00 2.00 0.00 10.00 0.01514 diatoms not counted 11.00 no data 61.39 2.97 14.85 19.80 0.00 0.00 0.00 0.00 0.99 0.00 13.00 no data 66.36 7.48 6.54 16.82 0.00 0.93 0.00 0.00 0.00 1.87 15.00 0.014 64.71 1.96 7.84 24.51 0.00 0.00 0.00 0.00 0.98 0.00 17.00 no data 68.00 7.00 7.00 18.00 0.00 0.00 0.00 0.00 0.00 0.00 19.00 no data 76.47 0.00 5.88 17.65 0.00 0.00 0.00 0.00 0.00 0.00 21.00 no data 70.10 0.00 9.28 18.56 0.00 0.00 0.00 0.00 2.06 0.00 23.00 no data 62.75 0.00 12.75 20.59 0.00 0.00 0.00 1.96 1.96 0.00 25.00 no data 64.15 3.77 3.77 11.32 4.72 4.72 1.89 1.89 3.77 0.00 29.00 no data 61.3 7.83 10.43 12.61 0.00 0.87 1.74 0.00 4.35 0.87 27.00 no data 65.35 3.96 0.00 21.78 4.95 0.00 0.99 0.00 2.97 0.00 31.00 no data 53.14 13.71 9.71 13.14 1.14 0.00 0.00 1.14 5.71 2.29 33.00 no data 55.91 10.00 5.45 15.91 0.00 0.91 1.82 1.82 8.18 0.00 35.00 no data 59.60 14.65 0.51 19.70 0.00 0.00 0.00 0.51 5.05 0.00 37.00 no data 60.13 11.11 3.92 15.69 0.00 0.00 0.00 1.31 6.54 1.31 39.00 no data 59.57 9.04 6.38 18.09 0.00 0.00 2.66 0.00 4.26 0.00 41.00 no data 49.58 8.40 2.10 18.07 0.42 0.84 4.20 1.26 13.03 2.10 43.00 no data 61.49 5.46 3.45 16.67 1.44 0.29 2.30 1.15 5.46 2.30 45.00 no data 61.05 9.47 8.63 12.42 0.21 0.42 0.42 1.26 4.00 2.11 COL POND, Cape Hershel, Ellesmere Island (Marianne Douglas) 210-Pb Diatoms: relative frequencies depth (cm) (Bq/g) Fragilaria pinnata Fragilaria pinnata var. intercedens Fragilaria construens var. venter Achnanthes marginulata Achnanthes minutissima unidentified Achnanthes spp. small Caloneis spp. Cymbella "sp. 2" unidentified Cymbella spp. Kraskella kriegeriana Navicula contenta and var. biceps (Diadesmis spp.) Navicula contenta and var. biceps (Diadesmis) unidentified Navicula spp. Nitzschia frustulum unidentified Nitzschia spp. all other diatom taxa 1.00 0.02232 1.03 0.00 4.12 5.15 15.46 7.21 1.03 17.53 9.28 0.00 4.12 5.15 7.22 0.00 15.46 7.23 2.00 0.01781 42.15 1.65 18.18 0.83 2.48 3.31 3.31 0.83 4.13 4.96 2.48 2.48 2.48 5.79 3.31 1.65 3.00 0.01571 42.48 4.42 38.05 0.00 0.00 0.00 0.00 5.31 0.88 0.00 0.00 0.88 0.00 4.42 1.77 1.77 4.00 0.0111 diatoms not counted 5.00 0.0107 52.25 5.41 42.34 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 7.00 0.00952 diatoms not counted 9.00 no data 53.64 10.91 35.45 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10.00 0.00888 diatoms not counted 15.00 0.00973 diatoms not counted 17.00 no data 61.78 3.82 34.39 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 25.00 no data 41.80 7.38 50.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.82 0.00 0.00 41.00 no data 45.16 10.48 41.13 0.00 0.00 0.00 0.00 0.00 2.42 0.00 0.00 0.00 0.00 0.81 0.00 0.00 57.00 no data 25.60 7.20 60.00 0.00 0.00 0.00 0.00 0.00 1.60 0.00 0.00 0.00 0.00 2.40 0.00 3.20 73.00 no data 34.55 5.45 56.36 0.00 0.00 0.00 0.00 0.91 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.73 89.00 no data 57.02 7.89 35.09 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 105.00 no data 54.78 8.70 35.65 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.87 121.00 no data 48.65 14.41 36.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.90 0.00 0.00 137.00 no data 51.43 1.90 43.81 0.00 0.00 0.00 0.00 0.00 0.95 0.00 0.00 0.00 0.00 0.95 0.00 0.95 153.00 no data 53.57 4.46 38.39 0.00 0.00 0.00 0.00 0.00 0.89 0.00 0.00 0.00 0.00 1.79 0.00 0.89 LOWER DUMBELL LAKE, Alert, Ellesmere Island (Marianne Douglas) depth (cm) Fragilaria pinnata Fragilaria construens Cyclotella cf. kuetzingiana var. planetophora Cyclotella meneghiniana Diploneis elliptica Nitzschia frustulum Nitzschia agnita unidentified Achnanthes spp. Amphora pediculus unidentified Navicula spp. unidentified Denticula spp. unidentified Cymbella spp. all other diatom taxa 0.00 11.81 0 18.45 12.18 2.95 7.01 2.95 10.33 9.96 16.24 1.11 2.21 4.79 0.50 55.22 5.97 4.48 3.73 7.46 1.49 0 1.49 3.73 11.94 0.75 0.75 2.99 1.00 91.43 0 0 0 2.86 0 0 0 5.71 0 0 0 0 1.50 no diatoms are present below 1.0 cm 2.00 no diatoms are present below 1.0 cm SOLSTICE LAKE, Fosheim Peninsula, Ellesmere Island (Alexander P. Wolfe) interpolated age Diatoms: relative frequencies depth (cm) calibrated 14C yrs BP Fragilaria pinnata Fragilaria pinnata var. subrotunda Fragilaria pinnata var. intercedens Fragilaria pinnata var. ventriculosa Fragilaria construens var. venter Fragilaria pseudocontruens Fragilaria capucina Synedra parasitica Achnanthes oestrupii Achnanthes peragalli Achnanthes pusilla Achnanthes minutissima Achnanthes flexella Navicula vulpina Navicula dicephala Navicula schmassmanii Navicula laevissima (Sellaphora) Navicula pseudoscutiformis Navicula capitata Navicula minuscula Navicula explanata Amphora lybica Pinnularia balfouriana Pinnularia legumen Pinnularia borealis Stauroneis anceps Stauroneis smithii Stauroneis phoenicenteron Cymbella minuta (Encyonema) Cymbella minuta fo. latens (Encyonema) Cymbella cymbiformis Cymbella angustata Cymbella behri Reimeria sinuata Nizschia frustulum Amphora perpusilla Eunotia praerupta unidentified Gomphonema sp. unidentified Neidium spp. Denticula elegans SUM of diatom valves counted chrysophyte cysts counted Diatom concentration, valves*10^6/g DW 0.00 0.00 39.84 24.60 4.41 0.00 1.34 0.00 1.60 0.80 2.54 0.67 1.87 0.27 0.53 5.48 2.81 0.67 0.94 0.40 0.00 0.00 0.00 5.75 1.87 0.13 0.27 0.13 0.53 0.13 0.27 0.13 0.13 0.00 0.00 0.00 1.07 0.80 0.00 0.00 0.00 0.00 748.00 12.00 155.75 1.00 39.00 38.75 19.97 3.06 0.00 1.33 0.00 5.33 1.73 0.27 1.46 2.53 0.27 0.53 7.59 2.40 1.20 0.80 1.20 0.00 0.27 0.00 5.46 2.13 0.27 0.00 0.00 0.27 0.13 0.27 0.53 0.00 0.00 0.00 0.00 1.60 0.40 0.27 0.00 0.00 0.00 751.00 23.00 138.49 2.00 79.00 39.20 19.40 2.80 0.60 3.60 0.20 4.60 1.20 1.80 1.40 2.00 0.00 1.00 4.00 1.80 1.60 0.20 1.00 0.20 0.20 0.40 4.80 2.20 0.00 0.00 0.00 0.60 0.00 0.60 0.40 0.20 0.80 0.00 0.20 1.80 0.40 0.20 0.60 0.00 0.00 500.00 15.00 32.41 3.00 118.00 62.37 17.74 6.45 0.00 2.15 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 3.76 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4.84 0.00 0.00 0.00 0.00 0.00 0.54 0.00 0.00 0.00 0.00 0.00 0.54 0.00 1.61 0.00 0.00 0.00 0.00 186.00 8.00 15.17 4.00 157.00 57.14 16.10 4.83 0.00 6.24 0.00 0.00 0.20 0.40 0.40 0.80 0.00 0.40 0.80 1.61 0.60 0.00 0.20 0.00 0.00 0.00 8.45 0.00 0.00 0.00 0.00 0.20 0.40 0.00 0.40 0.00 0.00 0.00 0.00 0.60 0.00 0.20 0.00 0.00 0.00 497.00 10.00 38.37 5.00 197.00 54.58 19.32 3.98 0.40 9.36 0.00 0.20 0.00 0.00 1.00 0.20 0.00 0.00 1.20 1.20 0.60 0.20 1.59 0.00 0.00 0.00 3.39 0.40 0.00 0.00 0.00 0.60 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.40 0.40 0.40 0.00 0.40 0.00 502.00 16.00 51.21 10.00 393.00 45.78 5.84 3.57 0.00 15.26 0.00 0.65 0.00 8.12 4.22 0.00 0.00 0.00 0.65 0.97 0.00 0.32 3.25 0.00 0.00 0.00 5.52 0.00 0.00 0.65 0.00 1.95 0.65 0.32 0.00 0.00 0.00 0.00 0.00 0.00 0.97 0.32 0.00 0.97 0.00 308.00 18.00 10.12 15.00 590.00 50.33 16.23 7.95 0.33 18.54 1.32 0.00 0.00 0.99 0.00 0.00 0.00 0.00 0.00 0.66 0.00 0.00 0.66 0.00 0.00 0.00 0.00 0.33 0.00 0.00 0.00 0.00 0.33 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.66 0.66 0.00 0.00 0.00 302.00 6.00 11.72 20.00 786.00 60.61 21.21 3.03 0.00 12.12 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2.02 1.01 0.00 0.00 0.00 99.00 3.00 6.63 25.00 983.00 47.32 17.86 9.82 0.00 12.50 0.00 0.00 0.00 0.89 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 5.36 0.00 0.00 0.00 0.00 0.00 0.00 0.89 0.00 0.00 0.00 0.00 0.00 0.00 0.89 0.89 0.00 1.79 1.79 112.00 5.00 7.71 30.00 1179.00 47.92 14.79 5.42 0.00 7.08 0.00 0.42 0.00 0.42 0.21 0.83 0.00 0.00 2.92 0.21 0.83 0.42 0.83 0.00 0.00 0.00 11.46 0.00 0.42 0.21 0.21 1.67 0.21 0.00 0.21 0.00 0.00 0.63 0.00 1.25 0.00 0.42 0.00 0.63 0.42 480.00 28.00 24.76 35.00 1500.00 47.87 22.87 6.78 0.00 6.40 0.78 0.00 0.39 1.36 0.58 1.16 0.00 0.00 0.39 1.36 0.00 0.19 0.00 0.00 0.00 0.00 5.81 0.00 0.00 0.00 0.00 2.33 0.00 0.19 0.00 0.00 0.39 0.00 0.00 0.78 0.00 0.00 0.00 0.39 0.00 516.00 11.00 60.26 40.00 2009.00 56.14 17.35 12.09 0.00 12.28 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.58 0.00 0.00 0.00 0.00 0.00 0.00 0.39 0.00 0.19 0.19 0.00 0.19 0.00 513.00 4.00 28.89 50.00 3026.00 52.52 21.33 7.24 0.00 14.08 0.40 0.00 0.20 0.00 0.00 0.00 0.00 0.00 0.20 0.40 0.00 0.00 0.40 0.00 0.00 0.00 2.21 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.00 0.00 0.00 0.20 0.40 0.00 0.00 0.00 497.00 11.00 32.69 55.00 3535.00 41.39 21.19 4.75 0.00 26.73 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.79 0.00 0.00 0.00 0.00 0.00 0.00 3.17 0.00 0.00 0.00 0.00 0.40 0.00 0.00 0.00 0.20 0.00 0.00 0.20 0.00 0.20 0.59 0.00 0.20 0.00 505.00 3.00 84.69 60.00 4043.00 30.48 22.67 8.57 0.00 29.52 0.76 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 1.90 0.00 0.38 0.38 0.00 0.00 0.00 1.33 0.19 0.19 0.00 0.00 1.33 0.00 0.19 0.00 0.00 0.00 0.00 0.00 1.14 0.57 0.00 0.00 0.19 0.00 525.00 3.00 172.68 65.00 4552.00 24.80 14.06 8.98 0.00 49.41 0.98 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.20 0.00 0.00 0.39 0.00 0.00 0.00 0.78 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.39 0.00 0.00 0.00 0.00 512.00 9.00 135.35 70.00 5061.00 30.68 12.69 6.44 0.00 46.02 3.41 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.38 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.38 0.00 0.00 0.00 0.00 528.00 4.00 109.85 75.00 5569.00 30.38 12.88 2.88 0.00 51.73 1.54 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.38 0.00 0.00 0.00 0.00 520.00 4.00 80.58 80.00 6078.00 19.73 11.30 0.77 0.00 63.03 4.21 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.19 0.00 0.19 0.00 0.00 0.00 0.00 0.38 0.00 0.00 0.00 0.19 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 522.00 2.00 131.45 85.00 6586.00 13.42 1.01 0.34 0.34 84.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 298.00 2.00 16.92 90.00 7095.00 26.16 12.21 4.65 0.00 55.43 0.78 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.78 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 516.00 5.00 247.51 92.00 7298.00 35.60 7.44 5.50 0.00 51.46 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 309.00 1.00 30.50