Architecturally, this specimen is one of the most stunning trees in Lancaster County. With codominant trunks reaching out in all directions from the middle of a horse pasture, its lateral spread is remarkable.
Most trees give a circular appearance in a satellite image but this tree’s outline (3rd photo) instead resembles some mysterious South Pacific island (4th photo shows famous Pitcairn Island). The tree takes up so much valuable farmland that the landowners must surely be fond of it.
Unfortunately I’ve been unable to approach this tree. My wild guess at identification is — as unlikely as it may seem — White Mulberry (Morus alba).
[Note: “Arbor arcanum” is Latin for “Tree of Mystery.”]