There are three types of craters that can be distinguished on the Earth’s surface; simple craters, complex craters, and complex craters with a distinct uplift, peak, or ring. Simple craters have have diameters up to 4 km, with uplifted or overturned rim socks surrounding a smooth bowl-shaped depression partially filled by impact breccias. Complex craters are generally over 4 km in diameter and exhibit slumped terraced rims. Complex craters with a central uplift, peak or ring share the same characteristics as complex craters except they exhibit a distinct central uplift and an annular (ring shaped) trough.
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