Phil obviously used the new Binford 9000 nuclear incubator, with the 32.3 gigawatt flux capacitor to incubate fossil ammonoid and nautiloid eggs. So he should have some left over to photograph.
From what I can gather, Nautilus eggs are very large, about 1" (25mm) and ammonoid eggs were small, about 1/32" (1mm). See a newly hatched nautilus here. Some rocks are full of ammonitellas, the initial chamber of the ammonoid shell, (you can see an ammonitella in the center of my avatar), these are possibly either egg masses or deposits of alot of newly hatched ammonoids.
From what I can gather, Nautilus eggs are very large, about 1" (25mm) and ammonoid eggs were small, about 1/32" (1mm). See a newly hatched nautilus here. Some rocks are full of ammonitellas, the initial chamber of the ammonoid shell, (you can see an ammonitella in the center of my avatar), these are possibly either egg masses or deposits of alot of newly hatched ammonoids.