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Lens

A rock body thick in the middle and tapered out at its ends

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Long ton

2,240 lbs. avoirdupois, compared to a short ton, which is 2,000 lbs.

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Logging

The process of recording geological or geophysical data

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Lodestone

 A variety of magnetite with a high percentage of iron, Fe3O4.

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Lode

A mineral deposit hosted or surrounded by solid rock

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Line cutting

Straight line cut through terrain for the purpose of geophysical mapping of the area