allochthonous

[uh-lok-thuh-nuhs]

al·loch·tho·nous

[uh-lok-thuh-nuhs]
adjective Geology. (of rocks, minerals, etc.)
not formed in the region where found. Compare autochthonous (def. 4).

Origin:
1910–15; allo- + -chthonous, modeled after autochthonous
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Allochthonous is always a great word to know.
So is strata. Does it mean:
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
Collins
World English Dictionary
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 allo- + khthōn (genitive khthonos) earth]

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