Simplify the following text for a Grade 14 native English-speaking person.
Original: In Scotland , traces of this tsunami have been recorded , with deposited sediment being discovered in the Montrose Basin ( estuary of the South Esk river ) , and the Firth of Forth , up to 80 km inland and 4 metres above current normal tide levels .
Simplified: In Scotland , traces of the subsequent tsunami have been recorded , with deposited sediment being discovered in Montrose Basin , the Firth of Forth , up to 80 km inland and 4 metres above current normal tide levels .