remains or impression of a prehistoric organism preserved in petrified form

something that has become rigid or obsolete

कुछ ऐसा जो कठोर या पुराना हो गया हो

English Usage: The old factory was a fossil of the past industrial era.

Hindi Usage: पुरानी फैक्ट्री पिछले औद्योगिक युग का जीवाश्म थी।