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| "Northwest and Northeast Quarters". End of 1996 season ... east 7572 Horizontal (normal) ... August 1996 |
| 'Southwest and Southeast Quarters'. End of 1996 season ... east 7572 Horizontal (normal) ... August 1996 |
| Center of trench: junction of 'Northwest, Northeast, Southwest and Southeast Quarters'. End of 1996 season ... east 7571 Horizontal (normal) ... August 1996 |
| 'Northwest and Southwest Quarters'. End of 1996 season ... north 7573 Horizontal (normal) ... August 1996 |
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