Table 3. Feldspar size measurements of tephra fall layers, Site 1000.
|
Core,
section |
Layer (cm) |
|
Size (µm) | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
Top
|
Base
|
Thickness
|
Age
(Ma) |
Median
|
Average
|
Standard
deviation |
Maximum
|
Minimum
|
|
| 165-1000B- | |||||||||
| 16H-6 | 17 | 22 | 5 | 4.5 |
280
|
279
|
51 |
387
|
172 |
| 22H-2 | 53 | 61 | 8 | 6.5 |
200
|
211
|
33 |
273
|
151 |
| 27H-5 | 109 | 113 | 4 | 7.3 |
148
|
149
|
17 |
193
|
123 |
| 36X-1 | 76 | 78 | 2 | 9.6 |
148
|
149
|
17 |
193
|
123 |
| 40X-2 | 44 | 47 | 3 | 10.4 |
182
|
188
|
29 |
251
|
152 |
| 48X-4 | 143 | 145 | 2 | 12.6 |
155
|
161
|
28 |
221
|
121 |
| 53X-3 | 134 | 135 | 1 | 13.8 |
124
|
130
|
26 |
202
|
94 |
| 56X-3 | 51 | 53 | 2 | 14.6 |
276
|
285
|
35 |
356
|
247 |
| 4R-4 | 50 | 53 | 3 | 14.6 |
267
|
290
|
70 |
506
|
225 |
| 5R-2 | 33 | 34 | 1 | 14.8 |
260
|
270
|
54 |
418
|
197 |
| 7R-CC | 0 | 6 | 6 | 15.5 |
416
|
434
|
86 |
678
|
344 |
| 11R-1 | 130 | 136 | 6 | 16.3 |
416
|
434
|
86 |
678
|
344 |
| 13R-5 | 94 | 101 | 7 | 17.0 |
170
|
179
|
32 |
280
|
142 |
| 14R-3 | 57 | 61 | 4 | 17.1 |
250
|
249
|
58 |
390
|
163 |
| 16R-4 | 73 | 104 | 31 | 17.7 |
580
|
575
|
105 |
728
|
377 |
| 16R-5 | 71 | 85 | 14 | 17.7 |
371
|
374
|
28 |
430
|
322 |
| 17R-4 | 14 | 17 | 3 | 17.9 |
352
|
371
|
55 |
468
|
291 |
| 18R-4 | 38 | 51 | 13 | 18.2 |
402
|
404
|
58 |
487
|
318 |
| 21R-4 | 19 | 72 | 53 | 19.0 |
373
|
362
|
53 |
442
|
247 |
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.