Although no evidence exists, some may have had eggs hatched within the maternal body. Eggs were lain on the ground. When groups of eggs are found in groups they are most likely part of a clutch laid at the same time. Few were buried and preserved.
Textures vary from somewhat smooth to finely pustullate.
Large adult dinosaurs did not always make large eggs. Nests A Emory University site with some basic information and a few images. First, most eggs have nothing organic in them. Instead the eggs are dense and filled with minerals, usually calcite or silica. Even when embryos are inside they are surrounded by mineral and very difficult to expose without destruction.