Question: What distinctive surface is the historic Merton Street, that runs parallel to High Street in the southeastern university city of Oxford, England?
Related documents: [0]  [DOC] Merton Street is a historic and picturesque cobbled street in central Oxford, England. It joins the High Street at its northeastern end, between the Ruskin School of Drawing and Fine Art (together with the Examination Schools) and the Eastgate Hotel at the historic east gate of the city. It then runs east-west, parallel and to the south of the High Street for most of its length. [END] 
[1]  [DOC] Oxford ( ) is a city in the South East region of England and the county town of Oxfordshire. With an estimated 2015 population of 168,270, it is the 52nd largest city in the United Kingdom, and one of the fastest growing and most ethnically diverse. The city is situated 57 mi from London, 69 mi from Bristol, 65 mi from both Southampton and Birmingham and 25 mi from Reading. [END] 
Answer: 
cobbled
cobbled