The difference between Autochthonal and Autochthonous
When used as adjectives, autochthonal means existing where it was formed or born, whereas autochthonous means native to the place where found.
check bellow for the other definitions of Autochthonal and Autochthonous
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Autochthonal as an adjective:
existing where it was formed or born; native, aboriginal, indigenous
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Autochthonous as an adjective:
Native to the place where found; indigenous.
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Autochthonous as an adjective (biology, medicine):
Originating where found; found where it originates.
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Autochthonous as an adjective (geology):
Buried in place, especially of a fossil preserved in its life position without disturbance or disarticulation.