Exactas y Naturales Divulgación
NORTH OF BUENOS AIRES
A five thousand years old marine beach found in Buenos Aires
Researchers from the San Pedro Museum recovered snails, oysters, fish fragments, ñandú eggshells and rodent bones at 180 kilometres from Buenos Aires. In addition, deer antlers were found with manufacturing marks that would have been made by former settlers.
Agustina Lima (Agencia CTyS-UNLaM) - Among the findings, three types of plants and seeds of an old coastal cord were also found. The director of the San Pedro Museum, José Luis Aguilar, told the CTyS-UNLaM Disclosure Agency “there is a lot of accumulation of materials from different moments of the prehistory of the area and also of different types of animals”.
The researchers estimate the beach was about 30 meters wide. After the excavation, three moments corresponding to the Holocene were discovered, while deer, fish and pottery fragments were found at the most modern level.
Doctor Daniel Loponte, archaeologist and researcher at CONICET, explained, “the paleontological and archaeological evidence we have of the middle Holocene for the Paraná Delta is very scarce, and therefore, the importance of this new record discovered in the area should be highlighted, because we lack all data about the human populations that lived in the region”.
The extracted fossils have a great state of conservation. Among the most prominent records, there are dozens of shell specimens of the genus Erodona and a small snail seven millimetres large called Heleobia australis.
The finding took place in Campo Spósito, in an area known as Bajo del Tala, while rural tasks were excavated. "All this accumulation of materials is nothing but the break of a marine beach about five thousand years old" said Aguilar.
A mixed ecosystem
As Aguilar observed, five thousand years ago, there was a very marked global warming, so “the sea level rose and an estuarial ecosystem was formed, similar to what is now Punta Rasa in the area of Samborombón Bay”.
In this sense, Doctor Eduardo Tonni, paleoclimatologist and Professor Emeritus of La Plata University, said, "The presence of these remains indicates that for that period there was a mixture of marine waters far beyond where they currently arrive."
"In this ecosystem different species lived together and their remains accumulated on that old beach due to the swell at the foot of the cliff," Tonni added.
During that time, the planet warmed, the poles melted and the seas rose considerably. As Aguilar reflected, this panorama may have inspired the ancient editors of the Bible, in the idea of a Great Flood on certain bases that today can be collated in geological and paleontological reality in different parts of the globe.
This finding also involved the researchers Julio Simonini, Matías Swistun, Javier Saucedo, Bruno Rolfo, Fernando Chiodini, David Tettamanti and Germán Tettamanti of the team of palaeontologists of the Museum of San Pedro, Doctor. Luciano Brambilla of the Center for Interdisciplinary Studies of the University de Rosario and Doctor Sergio Bogan of the Félix de Azara Foundation.