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| Drain area, north, looking north. Indicated with H is the Heavy Wall parallel to Great Drain, C is the cutting in bedrock scarp for continuation of Heavy Wall. D is the Great Drain wall, x is the poros ... AMS Horizontal (normal) |
| Drain area, north, looking west. Indicated with H is the Heavy Wall parallel to Great Drain, C is the cutting in bedrock scarp for continuation of Heavy Wall. D is the Great Drain wall, x is the poros ... AMS Horizontal (normal) |
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