LOWER MANHATTAN — Workers digging beneath Fulton Street have unearthed another historic treasure this week — a stone wall that dates back to the Revolutionary War.

The 6-foot-long wall, found seven feet under the ground in front of 40 Fulton St., was likely part of an 18th-century building that may have belonged to the Van Cortlandts or the Van Tienhovens, two influential early New York families who both owned property in the area, according to Alyssa Loorya, the archaeologist who is documenting the find.

The wall was later buried in landfill when Fulton Street was extended toward the East River....