21. Haughton, Canada (Topography on Air Photomosaic)

This image was constructed in the same manner (and scale) as that of the previous slide, except that a color-coded digital topographic model was used as the hue contributor. The rim is located just outside the nearly circular system of steep-walled river valleys that accentuate concentric faults and fractures generated by the collapse of this complex crater. There is in excess of 250 meters of topography remaining at this crater even after over 20 million years of surface exposure. Comparison of this slide with the previous one reveals that the existing breccia deposits occupy a small central basin that is only approximately half the rim-to-rim diameter of the crater. The Eleanor River outcrops in this central basin serve as local topographic highs that exceed in elevation the base level of the lake deposits originally emplaced atop the crater floor. This clearly demonstrates that these outcrops represent original crater floor topography.

Image courtesy of V. L. Sharpton.

Location: 75°22'N, 89°41'W
Diameter: 24 kilometers
Age: 23 ± 1 million years

Right click here to download a high-resolution version of the image (11.5 MB)