If you arrived here by any means other than from the Sahara Eye - Eyerus page,
or the Index of Impacts,
 it is suggested that you start at the Introduction to gain an understanding of what follows.

Ibro, The Brow of the Eye of the Sahara

     The brow of the Eye is the rim of a crater of 135 miles radius.This center of impact is 97 miles to the South southeast of the Eyerus Impact. There is no evidence of the impact at the center, as time, the winds and sand have long since covered it over. The evidence, again lies in the surrounding geography.
     The black rectangles in the image above are detailed below.

     A closer view of the Ibro rim to the North. This impact was probably from a loosely packed, comet type of object, that contained a lot of material but was not that fast moving. The reasoning behind this is that while this impact raised a 900 feet high rim at 135 miles distance, and there is evidence of numerous other shock waves out to 480 miles, this is in steep comparison to the Eyerus impact, whose rim is only 15 miles in radius, but whose shock waves can be seen at 4,285 miles and possibly beyond.

      This image is of the northern rim area, looking to the East. The rim at its maximum appears to be about 2100 feet in elevation. The lakes at the bottom of the cliffs are at about 835 feet elevation, about 400 feet below the sandy area to the left of the image. This part of the rim is greatly eroded by the winds of time. The arrows show parts of the original rim.

      The winds here come from an easterly direction. They move up over the rim, then down onto the lake. Winds blowing like this create a slightly high pressure area on the top surface of the rim, gently but continually compressing it over millions of years. Then as it passes over the top edge of the rim, the flowing air produces a semi-vacuum, a low pressure area, under the top of the rim, on the face of the cliffs. This low pressure allows the face of the cliffs to erode. Then as the winds drop to the valley floor, they create a sharp increase in pressure, due to the descending winds being forced to change direction. These winds blew the sands away creating the valley where water can accumulate. The warm winds then evaporate that water to create the clouds which move across the valley.

     To the Southwest, this same shock wave at 135 miles radius.

Closer in at 38 miles to the Southwest.


At 68 miles radius to the south, remnants of the wave. The Eye has been estimated at 98 million years old. This structure then would be older than that. The evidence of this impact has survived that length of time in the blowing desert sands.

At 185 miles radius, the circle is formed primarily to the North and West.

At 185 miles radius to the North.

At 185 miles radius to the South.

The 240 mile radius circle.


At 305 miles radius.




At 320 Miles radius.




At 340 Miles radius.

At 400 Miles radius.

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Index of Impact Sites
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© 2012 Terry Westerman