K-T boundary present between rocks of

Options

A. Devonian and carboniferoud
B. Permian and tertiary
C. Cretaceous and tertiary
D. Miocene and pliocene.

Answer

To answer the question regarding the K-T boundary, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the K-T Boundary**: The K-T boundary, also known as the Cretaceous-Tertiary boundary, is a significant geological marker that separates two major geological periods: the Cretaceous and the Tertiary.

2. **Identifying the Geological Periods**:
- The Cretaceous period is the last period of the Mesozoic Era, known for the dominance of dinosaurs.
- The Tertiary period follows the Cretaceous and is part of the Cenozoic Era, characterized by the rise of mammals and birds.

3. **Analyzing the Options**:
- Devonian and Carboniferous: These are earlier periods and do not relate to the K-T boundary.
- Permian and Tertiary: The Permian is also an earlier period, and this option does not include the Cretaceous.
- Cretaceous and Tertiary: This option directly mentions the periods separated by the K-T boundary.
- Miocene and Pliocene: These are both part of the Tertiary period and do not relate to the K-T boundary.

4. **Conclusion**: The K-T boundary is specifically located between the Cretaceous and Tertiary periods, making option 3 the correct answer.

### Final Answer:
The K-T boundary is present between rocks of the **Cretaceous and Tertiary**.

---