Table 2. Feldspar size measurements of tephra fall layers, Site 999.

Core,
section
Layer (cm)
Size (µm)
Top
Base
Thickness
Age
(Ma)
Median
Average
Standard
deviation
Maximum
Minimum
165-999A-                
6H-3 10 14 10 1.45 232 231 27 275 165
6H-5 10 12 10 1.57 150 155 13 183 138
17H-4 112 116 112 5.67 154 158 25 227 124
27X-2 145 150 145 9.01 290 295 39 400 237
34X-2 133 135 133 11.67 162 162 25 215 113
34X-3 45 54 45 11.69 194 204 46 312 146
36X-3 10 16 10 12.46 140 141 18 180 112
37X-6 46 50 46 13.06 284 281 48 367 206
39X-2 5 12 5 13.59 284 281 48 367 206
40X-1 54 60 54 13.95 116 116 15 152 92
40X-2 57 60 57 14.02 204 212 27 285 176
40X-4 82 85 82 14.16 280 279 33 350 220
42X-5 50 60 50 15.04 230 232 26 300 195
44X-2 73 79 73 15.68 219 214 38 297 139
47X-4 145 150 145 17.15 154 156 19 196 127
47X-5 104 116 104 17.2 174 179 28 260 132
48X-4 29 36 29 17.54 336 344 65 468 230
48X-6 42 43 42 17.69 336 337 59 484 245
49X-2 76 81 76 17.87 177 189 34 243 141
49X-3 50 54 50 17.93 266 280 46 414 226
49X-4 24 28 24 17.98 166 167 18 197 137
50X-1 70 79 70 18.25 194 203 34 275 146
50X-4 36 41 36 18.44 168 172 18 211 143
50X-4 103 110 103 18.47 202 212 48 356 155
51X-4 86 93 86 18.92 202 206 37 347 167
52X-1 72 77 72 19.16 110 118 29 194 87
52X-2 70 80 70 19.24 168 175 29 239 130
53X-4 140 145 140 19.89 184 181 23 222 134
54X-2 143 144 143 20.21 114 121 29 226 98
58X-5 58 62 58 21.87 112 115 29 190 79
165-999B-                
7R-3 53 59 53 24.65 112 115 29 190 79
7R-5 53 63 53 24.8 193 190 16 216 150
7R-CC 8 14.5 8 25.0 297 302 40 392 220
8R-1 51 57 51 25.0 156 159 12 190 143

Notes: Minimum size is of the 20 smallest feldspar crystals. All other measurements are of the 20 largest feldspar crystals. All measurements taken along the long axis.