Is it correct to mix the present and the past?

Hello teachers,
Context:
Ancient Romans also had a version of take-out food. Pompeii is filled with shops that contain dishes to hold or display food. Many shops had built-in stoves that allowed them to cook and serve food. Types of foods that have been found in these shops include dates and lentils.

The first sentence is in past because it refers to the ancient Romans.
Is the second one in present because it is referring to Pompeii as it is today, the evidence?
Is it correct to mix the present and the past in this case?

Thanks in advance.