HiPOD (9 April 2018): Troughs with Axial Ridges in Acidalia…

HiPOD (9 April 2018): Troughs with Axial Ridges in Acidalia Planitia 

  There are large, hundreds of meters in length, troughs in Acidalia Planitia, with high axial ridges down the center. While they appear fairly bland in Mars Orbital Camera images, we can see better details, including craters in the troughs.