Eye of the Sahara

The Richat Structure in the Sahara desert of Mauritania. This structure is a deeply eroded, slightly elliptical, 40 km in diameter, dome. The sedimentary rock exposed in this dome ranges in age from Late Proterozoic within the center of the dome to Ordovician sandstone around its edges.

Initially interpreted as an asteroid impact structure because of its high degree of circularity, it is now argued to be a highly symmetrical and deeply eroded geologic dome. Despite extensive field and laboratory studies, geologists have found a lack of any credible evidence for shock metamorphism or any type of deformation indicative of a hypervelocity extraterrestrial impact. While coesite, an indicator of shock metamorphism, had initially been reported as being present in rock samples collected from the Richat Structure, further analysis of rock samples concluded that barite had been misidentified as coesite.

In addition, the Richat Structure lacks the annular depression that characterizes large extraterrestrial impact structures of this size. Also, it is quite different from large extraterrestrial impact structures in that the sedimentary strata comprising this structure is remarkably intact and “orderly” and lacking in overturned, steeply dipping strata or disoriented blocks.

  1. of-the-beholder reblogged this from bigboyclitt
  2. orion-wolves reblogged this from awwshie
  3. pausing-rain reblogged this from dontwearbras
  4. lullaby-of-a-starlit-sky reblogged this from darkl0rd-satan
  5. darkl0rd-satan reblogged this from whereiwastemytime
  6. whereiwastemytime reblogged this from dontwearbras
  7. dontwearbras reblogged this from bigboyclitt
  8. smut-i-dug-up reblogged this from awwshie
  9. bigboyclitt reblogged this from non-curae
  10. non-curae reblogged this from awwshie
  11. emmajls reblogged this from awwshie
  12. awwshie reblogged this from ok-pal
  13. ok-pal reblogged this from terra-mater
  14. reigenmusic reblogged this from terra-mater
  15. lousycrut reblogged this from terra-mater
  16. node6 reblogged this from terra-mater
  17. thunderwishes reblogged this from we-are-star-stuff
  18. jeremylawson reblogged this from rocketmo0se
  19. reverbivore reblogged this from we-are-star-stuff
  20. annatto60 reblogged this from nabokovcazandomariposas
  21. fleshtemple reblogged this from nabokovcazandomariposas
  22. nabokovcazandomariposas reblogged this from plotscape
  23. rocketmo0se reblogged this from misterbrownn
  24. rwenite reblogged this from terra-mater
  25. mayatropolis reblogged this from taoguide
  26. deeperthanthesea reblogged this from taoguide
  27. taoguide reblogged this from carex
  28. volatile-elements reblogged this from terra-mater

Theme NIGHTNIGHT by DEDDY