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Drilling on the Shatsky Rise shows that only subtle changes in the lithology, mineralogy, and physical properties of the calcareous nannoplankton ooze occur across a major unconformity.
Sediments above the unconformity are late Miocene and younger, and contain an eolian and andesitic volcanic contribution in addition to the dominant pelagic calcareous component. Below the unconformity the noncalcareous component decreases and consists mainly of K-feldspar and zeolite.
The Shatsky Rise has been a positive feature since the Maestrichtian, and despite considerable widespread subsidence of the floor of the northwest Pacific since that time (or earlier), uplift of the crest has occurred and may coincide with the pre-late Miocene hiatus.
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