Plant life includes palm trees and conifers of the family Podocarpeaceae ("plum pines"), which formed dense forests and wetlands. Remains of land animals were also common in this formation. An indeterminate rhynchocephalian is known, as well as numerous snake taxa including the madtsoiids Patagoniophis and Alamitophis. Other non-dinosaur animals in the area include the pterosaur Aerotitan and a variety of mammals. Dinosaur remains recovered from the Allen Formation include a diverse and abundant assortment of titanosaurs (Saltasaurus, Aeolosaurus, Laplatasaurus, Rocasaurus, etc.) and a hadrosaurid of dubious validity (Willinakaqe). Theropods other than Quilmesaurus were also present; they include the large unenlagiine dromaeosaurid Austroraptor, a basal ornithuran bird (Limenavis), and a cimolopterygid bird (Lamarqueavis). A tooth has been referred to the family Carcharodontosauridae; this tooth is one of the most recent carcharodontosaurid fossils found as more well known members of this family (Giganotosaurus, Mapusaurus) lived millions of years earlier in the Cretaceous. Indeterminate nodosaurid remains have also been found at this formation, consisting of vertebrae, osteoderms, a femur, and a tooth. The Allen Formation is also notable for the high amount of sauropod eggs discovered there. Nesting grounds have been discovered in the bajo de Santa Rosa area of the upper Allen Formation. Some (but not all) of these eggs were designated as the oogenus Sphaerovum. The structure of their eggshells indicate that they were laid in a very damp environment. See also Timeline of ceratosaur research References Brachyrostrans Late Cretaceous dinosaurs of South America Cretaceous Argentina Fossils of Argentina Allen Formation Fossil taxa described in 2001 Taxa named by Rodolfo Coria Nomina dubia