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The biological marker compounds 17α(H) and 17β(H), 23,28-bisnorlupane have been identified in a coaly interval at about 3300-3320 m depth within the lower Taglu Sequence (early Eocene) in the Immiugak A-06 well in the Beaufort-Mackenzie Basin. These biomarkers were previously only known to occur in the lower part of the Richards Formation and were thus used to infer that the Richards was the source...
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