I have seen a few pictures of the cut trunks to these giant trees. They are HUGE. Can you post some pics here or a link to find them?
Man finds evidence of super massive tree w/leaves longer than the Empire State Building
As a kid I remember the Ranger telling us the story of the giant bear making the marks on Devils Tower
https://www.nps.gov/deto/learn/historyculture/first-stories.htm