I'm assuming it isn't native to the area based on the way three of them were located so close to each other, but I could be wrong. The needles were soft.
3rd photo shows smaller, finer size of dawn redwood leaves compared with coast redwood. This tree was identified on the trail map as a Dawn Redwood.
Metasequoia glyptostroboides, the dawn redwood, is a fast-growing, critically endangered coniferous tree, the sole living species of the genus Metasequoia, one of three species in the subfamily Sequoioideae. It is native to the Sichuan-Hubei region of China. Although shortest of the redwoods, it grows to at least 200 ft (61 m) in height.