Massive asteroid impact 6.3 million years ago left giant glass field in Brazil

Scientists have identified Brazil's first known field of tektites, the glassy material created when an asteroid or other extraterrestrial object strikes Earth with extreme force. These newly recognized specimens, called geraisites after the state of Minas Gerais where they were first found, form a previously unknown strewn field. The discovery helps fill gaps in South America's incomplete record of ancient impact events.

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