SEDIS - Thesaurus
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Yudomian
RT
Aldan Shield
Cambrian
Eocambrian
Lower Cambrian
Neoproterozoic
Precambrian
Proterozoic
Russian Federation
upper Precambrian
SN
Aldan Shield area, Russian Federation. Used most often to apply to Lower Cambrian, but some have used it to refer to Neoproterozoic. Indexed with additional age terms as applicable. Added to Thesaurus in 1985.
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