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.