A group of fossils, shells, molds and “traces” of ancient organisms was found in hot springs around Cartago. These fossils provide clues to scientists about what life was like in that area 10 million years ago.
Locals alerted the news, and a team of researchers from the School of Geology at the University of Costa Rica moved to the nearby Residential Agua Caliente in Cartago to investigate the report.
The paleontologist Sergio Hernandez said that the fossils found, correspond to a group called Formation Coriswhich belonged for 10 million years or so, when that area was sea floor, instead of land.
“A formation, is a deposit of common origin sediments that accumulate in one area (room) and after a million years become a large rock mass. The formations does not necessarily coincide with the geographical divisions, “said the scientist.
Hernandez and his equip, found fossils of bivalves (shells), both natural and fossil molds, that means those that still have original parts of the body.
“They also found ichnofossils, which are not exactly remains of the organism itself. They are vestiges or traces of their activity, “explained the expert.
The paleontologist emphasized that these elements reinforce the theory that some 10 million years this area was a seabed, but a little depth and close to the coast.
“This means that, for various volcanic and tectonic conditions, water was receding and the earth was moving to be exposed in the form of mountains as we see today,” said Hernandez.
Scientists estimate that it was an environment with a high rate of sedimentation and organic production, but with little presence of oxygen. However, the conditions of death of the organisms were favorable to preserve their remains in good condition.
“The territory which today is known as the Central American Isthmus, means that the belt stretching from southern Nicaragua to northern Panama was completed between three million years ago,” he said.
The expert testified that Costa Rica has several areas rich in fossils such as Patarrá.
“The Patarrá is a limestone, while in Cartago is a sandstone sediment combining with 90% of quartz grain. This stone is popularly known as Molejon and was used to sharpen knives. “