He was sometimes able to make astute and informed deductions from what he saw. At Lincoln, for example, he identified three phases of urban development, beginning with a British settlement at the top of the hill (close to which "much Romaine mony is found"), the Saxon and medieval town further south, and a more recent riverside development at Wigford. He was able to judge that the existing fabric of Ripon Minster "indubitately was made sins the Conquest". He correctly distinguished what he called "Briton brykes" (actually Roman bricks) at several geographically dispersed sites, including Verulamium, Richborough, Lympne, Dover Castle, Canterbury, and Bewcastle.