Sierra Perenchiza Formation

The Sierra Perenchiza Formation is a geologic formation in Spain. A late Campanian to early Maastrichtian age is supported by paleomagnetic data and fossil pollen analysis. The Sierra Perenchiza Formation "consists mainly of interbedded carbonate marls and lacustrine limestones, interpreted as deposits of small ephemeral lakes and ponds of a coastal environment". Vertebrate fossils are common in the formation: these include dinosaurs, pterosaurs, crocodylomorphs, turtles, squamates, frogs, albanerpetontids, and ray-finned fish, as well as dinosaur eggshell fragments. Also known are freshwater invertebrates and plant remains.