First data on dinosaur eggs and clutches from Pinyes locality (Upper Cretaceous, Southern Pyrenees)

we describe a new megaloolithid locality discovered near coll de nargó (catalonia, northeastern iberian peninsula). eggs at the pinyes site occur within extensively developed, vertically-stacked paleosols of an alluvial system. eight clutches were excavated and mapped and biological and taphonomic aspects recorded. three-dimensional maps were constructed using a trimble total station, supplementing traditional planview mapping to allow more accurate interpretation of egg and clutch distribution. the megaloolithus siruguei eggs are compressed, presenting an ellipsoidal shape. the three-dimensional geometry of two large clutches suggests that the eggs were laid in shallow, bowl-shaped depressions. tangential thin sections of eggshells also reveal abundant pores, consistent with incubation in a high humidity/ low oxygen environment. these data support previous inferences that m. siruguei eggs were buried in shallow pits.