Besides radio dating which method can be used to find out whether a fossil is of oder era ?

Options

A. Lava deposits
B. Igneous rocks
C. Metamorphic rocks
D. Sedimentary strata.

Answer

To determine whether a fossil is from an older era besides using radiometric dating, we can use the method of examining lava deposits. Here’s a step-by-step breakdown of how we arrive at this conclusion:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a method to determine the age of a fossil, specifically looking for alternatives to radiometric dating.

2. **Reviewing the Options**: The options provided are:
- A) Lava deposits
- B) Igneous rocks
- C) Metamorphic rocks
- D) Sedimentary strata

3. **Analyzing Each Option**:
- **Option A: Lava Deposits**: These can be used to date fossils found in layers above or below the lava. By examining the layers of volcanic activity, we can infer the relative ages of the fossils.
- **Option B: Igneous Rocks**: While they can provide some information, they are not typically used directly for dating fossils.
- **Option C: Metamorphic Rocks**: These rocks are formed under heat and pressure and do not provide a direct method for dating fossils.
- **Option D: Sedimentary Strata**: While sedimentary layers can provide context for fossils, they are not a direct dating method without additional information.

4. **Conclusion**: The best alternative method to radiometric dating for determining the age of a fossil is through the analysis of **lava deposits**. Therefore, the correct answer is **Option A**.