I was able to track down the trademark on the one piece (thrills!!!). W. B. Jr. & Co. was used by William Brunt Jr. & Company of East Liverpool, Ohio from 1877 to 1882.
Ironstone china, in spite of the name, it does not have any iron in it. It was called ironstone for its weight, strength, and durability. Sometimes called earthenware, it is a vitreous pottery first made in 1813 in the UK as a less expensive alternative for porcelain that could be mass produced.
There is still a great deal of construction going on in the area, so I'm hoping a new rubble pile will appear soon.