Around 21,000 years ago, the ice began to melt, retreating from Long Island between 21,000 and 19,500 years ago.
Ice began retreating from Long Island between 21,000 and 19,500 years ago. Around 21,000 years ago, the ice began to retreat.
Around 21,000 years ago, the ice began to retreat. Ice began retreating from Long Island between 21,000 and 19,500 years ago.
Around 21,000 years ago, the ice began to retreat. Ice began retreating from Long Island between 21,000 and 19,500 years ago.