Go look up Coral harbor, it’s in the neighborhood, named so for the natural Coral that litters the beaches.
Look up Grise fiord, you can walk the beaches there too and find the same Coral that you find on Hawaiian beaches.
The Coral needs about 82 degrees to do well.
Most probably due to earth’s crustal shift. When they used water cannons for mining gold in AAlaska’s gold fields as they cut deep into permafrost they uncovered frozen tropical forests and the remains of sabre toothed tigers and many other temperate/tropical lifeforms. Scientists claimed that this was the result and approximate 90° shift in the Earth’s crust that was so violent that it tore trees and lifeforms apart and resulted in quick freezing those forms that shifted to the Arctic.