The iridium anomalies in the K-Pg boundary layer are not the result of a marine enrichment process or oceanic mass extinction.
There was a large planetary impact 66 Ma.
Shocked materials found in the K-Pg boundary originate from an extraterrestrial impact.
Significant volcanic activity coincided with the K-Pg boundary.
Volcanism was a primary factor affecting ecological survival and recovery.
Global oceanic events have played a large role in extinction events and could have been a significant terrestrial factor in the K-Pg mass extinction.