A region is characterized by numerous anticlines and synclines. There are also several faults present that appear to have formed at the same time as the folding. Without looking at any details, what type of faults would you assume them to be?

thrust or reverse as its in a compressional setting and you know that because of the folding.

Explanation:

A thrust fault is breaking of the earth's crust where the older rocks are pushed over the younger rocks and have an inclination of 45° or less. Creating a displacement of the overlying blocks, they can be blind thrust, fault bend faults, and fault duplex. These thrust faults occur in areas foreland basins and compression does not result in the process of mountain building as mostly the folding and stacking of the thrusts.