|University of Bristol|
These clutches show relatively less complex arrangements than in the theropods, but the close proximity of some of the eggs has suggested to some workers a colonial nesting ground (Jain, 1989).
More randomly-shaped sauropod nests are known from Argentina (Powell, 1985). These contain up to 12 eggs. Nests found recently in Patagonia, identify the egg-layers as titanosaurs, based on embryos with teeth and skin textures. The eggs were laid in clusters, in 1.5 m long groupings, resting on gently sloping floodplains. The rivers must have burst their banks and the embryos were drowned and buried.
Other egg-laying strategies have also been observed in Rennes-le-Chateau, France (Breton, 1986). The eggs are arranged in arc structures, which if connected would form circles of 15-20 eggs. The circles were of a radius of about 1.5 m and have been suggested to correspond to the animal turning while it was laying the eggs. Variation in the size of these circles could be due to different sizes of egg-laying females.
(modified from Cousin 1994)