(Of a process) occurring immediately after deposition of a particular stratum.
- The depositional facies are consistent with penecontemporaneous, explosive volcanism.
- The occurrence of penecontemporaneous flood basalt volcanism in the region further suggests that the uplift was caused by a rising mantle plume.
- A penecontemporaneous river, the Walshville channel, restricted peat deposition along its course, and later deposited thick elastics over the peat.
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