Mary Cowles Clark Colored Lithograph “Stone Alley” Consign Now DeptFine Arts, Nantucket Art Mary Cowles Clark (1871-1950) Colored Lithograph “Stone Alley”, signed lower right. Mary Cowles Clark was a member of the Nantucket Art Colony and summered on Nantucket in the 1920s and 1930s. Please note that this auction has ended. Click here for an overview of this auction.