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| single bed of sedimentary rock, consisting of one kind of matter representing continuous deposition |
| process where the surface of the earth is worn away by the action of water, glaciers, winds, waves |
| allochthonous (əˈlɒkθənəs) | |
| —adj | |
| Compare autochthonous (of rocks, deposits, etc) found in a place other than where they or their constituents were formed | |
| [C20: from Greek allokhthon, from | |