The trunk below is Lost Man's Fault in Redwood National and State Parks. The huge coast redwood titan probably fell over during a powerful Pacific storm. Looking at its condition and the size of other live trunks growing from it, I think it fell about two centuries ago, around 1800 A.D.. Napolean Bonaparte was still alive, and Abraham Lincoln almost born. Its even possible the storm that pinned-down the Lewis and Clark Expedition for days along the Columbia River was the same that toppled this redwood giant.
We didn't measure the base yet, but the photo implies potential it came close to one of the illusive 30 footers a few of us hope to find standing. The grove is exceptionally photogenic and home to Eden redwood.
One reason I posted this is to show what the Dyerville Giant farther south in Humboldt Redwoods State Park will never become. The parks posted signs by the Dyerville redwood hoping people would stay off so that nature reclaims it entirely with plants. But that dream is not going to happen, especially with trails around and over it, plus parking nearby. Take a look at that page for comparison.
This autumn photo shows what normally happens as nature reclaims with decay, organisms and plant life. Given 1000 years its not the loss of a redwood but a renewal of the forest.