Where deer might have roamed according to an old English geologist (8)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

I take it that this is a sort of double (‘triple?) definition: there are various places called Buckland in the UK and elsewhere, where bucks (and does) might have roamed; the geologist is William Buckland , who was a theologian, but also an important figure in the early 19th century transition from a Biblical to evidential view of the earth’s history and geology.