Oofamily (fossil eggs). Jackson et al., 2013, retain this as an accepted family, while noting that Donair & López-Martínez, 2009, referred Ornitholithus from France and Spain to Elongatoolithidae.
Jackson, F. D.; Varricchio, D. J.; Corsini, J. A. (2013). Avian eggs from the Eocene Willwood and Chadron formations of Wyoming and Nebraska. <em>Journal of Vertebrate Paleontology.</em> 33(5): 1190-1201.