THE grikes, or channels, frequently formed by the corrosive action of carbonic and organic acids upon the surfaces of exposed limestone beds are known to most geologists, but a case I recently met ...

IN the Lower Old Red Sandstone of the west of Caithness I have noticed an appearance which recalls the grikes due to erosion of which Mr. Carus-Wilson writes in NATURE of May 1. It is seen in the ...

CC0 Usage Conditions ApplyClick for more information. Located in the Beehive State of Utah, Arches National Park has over 2,000 sandstone arches that stand ...

Why it's incredible: The rock formation is split cleanly down the middle as if cut by a laser. The Al Naslaa Rock Formation is a landmark in the Saudi Arabian desert formed of two big blocks of ...