______ period in _______era was known as the Golden age of reptiles.

Explanation

**Step-by-Step Solution:**

1. **Identify the Era**: The question asks for the era known as the "Golden Age of Reptiles." This era is the Mesozoic Era.

2. **Identify the Period**: Within the Mesozoic Era, the specific period referred to as the "Golden Age of Reptiles" is the Jurassic Period.

3. **Combine the Answers**: Therefore, the complete answer to the question is: "Jurassic period in Mesozoic era."

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