So I have ran into these trees a number of times now in 3 locations growing understory to regen forest about 70 years old. Never very large (20cm dbh and 5m tall at most) and have never found any cones. I would think its Cupressus but what species and if the foliage is mature I've no idea. The other part of the puzzle is what they're doing out there? Tree planting experiment failed?