[2] The Pego Longo (Carenque) dinosaur footprint deposit was discovered in 1986 by two Geology students from the Faculty of Sciences of the University of Lisbon, Carlos Coke and Paulo Branquinho, in a deactivated quarry located southwest of Belas.

[2][3] This monument consists of a set of subcircular and tridactyl footprints containing one of the largest tracks in Europe, with an extension of approximately 140 m (460 ft).

[2] In August 2020, António Galopim de Carvalho, a geologist and former director of the National Museum of Natural History and Science, Lisbon says he felt like “crying” the last time he was there because “it's turned into a dump.

They always received me with the greatest sympathy and consideration, but, concretely, they did nothing, even when I proposed that the work could be phased in successive years, and that partnerships be found”.

[3] Basílio Horta, Mayor of Sintra, says the City Hall doesn't have anything to do with it and proceeds telling that the land is private and that the monument depends on the state.