Archaeologists have found evidence of at least two graves, along with artifacts such as a fragment of an ink bottle, a porcelain piece of doll’s foot, and building foundations, during a dig at the site of a historic African American church in Colonial Williamsburg, officials said Monday. The discoveries were made in late summer and early fall beneath a parking lot on Nassau Street at the former location of the old First Baptist Church. One of the oldest Black churches in the country, it had buildings on the spot in 1856, and perhaps as early as 1818. It was organized in 1776.