11. An unusual occurrence of covellite was found replacing organic debris in the red beds of New Mexico. 12. Red beds , which are colored by hematite, indicate an increase in atmospheric oxygen 2 billion years ago.13. The sediments are of continental nature ( red beds ) and form massive sandstone and siltstone bodies. 14. The " Red Beds of Khermeen Tsav " are also considered part of the Barun Goyot formation. 15. The salinity derives from Permian red beds , and has a strong structuring effect on the Red River's biota. 16. Red beds are associated with landslides.17. In Europe, most of the Lower Triassic is composed of Buntsandstein, a lithostratigraphic unit of continental red beds . 18. They are widespread in north Texas, where their characteristic red beds are spectacularly exposed in Palo Duro Canyon. 19. It is succeeded ( overlain ) by the Warwickshire Group which comprises a largely non-productive sequence of red beds . 20. Five pale green-to-white, leached red beds that are as much as thick give a variegated appearance to this member.
