Individual Diatom cells are located at the ends of long stalks that are attached to the rock. Photo taken Nov. 1986. Photo taken Nov. 1986. Photo taken Nov. 1986. See description below of thin section also.
Sharp outline is due to high current flow.
Photo taken March 1987. Hard, lithified carbonate stromatolites in Laguna Garabatal photographed during the dry season. Photo taken at 100X magnification. Photo taken at 100X magnification. Barbara Winsborough photo 40K jpeg Photo of wall of clinic in Cuatro Cienegas showing ancient lake stromatolites preserved in stone, that were quarried in the basin.