A recently publicized discovery of a Columbian Mammoth tusk located well of the coast of California in quite deep water made me wonder if geological conditions 100,000 years ago can explain how it got to the location it was found at?
Pilot Randy Prickett and scientist Steven Haddock, researchers with Monterey Bay Aquarium Research Institute (MBARI), discovered a Columbian mammoth tusk 185 miles offshore and 10,000 feet deep in the ocean in 2019, the institution said in a news release.
According to the Monterey Bay Aquarium Research Institute, the tusk portion is at least 100,000 years old:
The team believes it could be the oldest well-preserved mammoth tusk recovered from this region of North America. Dating of the tusk is being done by the UCSC Geochronology Lab led by Terrence Blackburn, associate professor of Earth and planetary sciences. Blackburn analyzed radioisotopes to show that the tusk is much more than 100,000 years old. “Our age estimate on the tusk is largely based on the natural radioactive decay of certain uranium and thorium isotopes imparted to the tusk from the ocean. If the tusk had been found on land, deciphering its history would not be as straightforward,” said Blackburn. Christopher Edwards and Patrick Drake will examine the oceanographic currents to better pinpoint where the tusk originally came from.
Another article I looked at mentioned they were exploring an underwater seamount formation with the ROV, so it looks like the approximate location might be about here:
This looks well beyond any continental shelf or continuous undersea canyon type formations which might connect the location to the shoreline.
So, is there a geological explanation for how this mammoth tusk might have ended up at this location?