Nonstructure 6-N, extramural surface

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No.

Interpretation

Construction

Remodeling

1

Use surface on which features were constructed.

In EU 139 (unit 88N 185E), surface is Dewey Bridge bedrock; in EU 140 (unit 89N 191E), surface is sterile sediment (either undisturbed or redeposited native sediment).

None.