Hints: Europe Baltic Poland

All across Europe, life struggled to hold on. The extinction of the dinosaurs created opportunities for new forms of life, evidence of which can be found here on the Baltic coast of Poland. These fishermen are after a catch that could change their lives. They are not after fish or crabs but something far more precious washed up from the seabed.
One lucky dip could net a small fortune and open a window back more than 15 million years into Europe's past.
This is amber. It doesn't look much until it's polished. Then it can reveal all kinds of treasures.

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