They are known as fossils from the Carboniferous Epoch of the great Palaeozoic era -LRB- 300,000,000 years ago -RRB- . वे पैलियोजोइक महाकल्प ( 3000,00,000 वर्ष पूर्व ) के कार्बनी युग से जीवाश्मों के रूप में ज्ञात हैं .
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