A normal redwood forest.
Redwood forests are added with the ExtrabiomesXL mod. True to their name, they commonly have very large redwood trees that can exceed 60 blocks in height. They can also have steep cliffs and overhangs.
Giant Redwood In A Meadow Biome
In addition, there is one other type of redwood most commonly found in meadows; these grow to be about 200-250 blocks tall. They have a thick outer bark and a wood interior. The bark and inteiror both give 4 planks when crafted.