Again, in regard to "impact" evidence, the Global Impact Studies Project states:

"The rim is well-defined and rises 15-25m above the local topography, and 53m above the crater floor. ...While breccias are not found at Aouelloul, impact glass can be found on the south, southeast, and north outer part of the crater rim. Because the glass is enriched in siderophile elements, has a low water content, and contains lechatelierite (a product of shock deformation), it has been interpreted as an impact glass."

"Proving Allouelloul’s impact origin has proved extremely difficult.... Instead of relying on petrography, scientists have used chemical analysis to prove an impact origin here. While most of the glass is compositionally similar to the local Zli sandstone, the glass does have high concentrations of Fe, Co, Ni, and Ir. All of these elements are extremely common in stony meteorites, and then ratios in the impact glass are consistent with ratios seen in meteorites. In addition, the Re-OS isotope ratios of the glass were measured. This method examines the admixture of small amounts of recondensed material with low Os ratios to target rocks with high Os ratios. 

"At Aouelloul, the Os ratios of the impact glass are extremely similar to those of both chondritic and iron meteorites. This suggests that the Os present in the glass came from a meteorite, as the amount present is much too high to have had a terrestrial origin."

Again, the Project conclusion (of impact) is premature: An interplanetary thunderbolt would also melt siderophile debris into glass. In fact, the question is still open about how much melting an impact can produce: Laboratory impacts expend most of their energy in shock displacement. Material suddenly “flows” in a starburst pattern and just as suddenly “freezes” again. Very little melting occurs, because the energy is dissipated too quickly for conduction to raise materials to their melting points. Electric discharge, on the other hand, can directly heat the material.

Quarkziz crater, 3.5km in diameter

See: http://www.image-contrails.de/algeria/index.html

The Quarkziz crater is another that is in the same region as the Richat aligned craters. Again, regarding the impact issue,  the Global Impact Studies Project states:

"The Quarkziz crater is located in western Algeria, close to the Moroccan border. The crater is 3.5km in diameter, and has a central uplift structure. The external rim has a height of 100m from top to bottom, and is made up of strongly dipping sedimentary rocks...."

"Quarkziz has limited evidence of an impact origin, in that no impact glass or meteorite fragments have been found. However, petrographic studies have identified planar deformation features in quartzites from the central uplift structure, and from the outer edges of the crater...."

Composed by Shaun Bourke and Michael Armstrong