Some articles on remiornis:

Gastornis - Trace Fossils
... from Europe, on the other hand, was a bustard-sized bird, and the mysterious large Remiornis from France is only known from Paleocene remains ... If Remiornis is indeed correctly identified as a ratite (which is quite doubtful however), Gastornis remains as the only known animal that could have ... It is also notable that at least one species of Remiornis is known to have been smaller than the Gastornis, and was initially described as Gastornis minor by Mlíkovský in 2002 ...