Arkoses is a 7 letter English word. It's valid Words with friends word worth 10 points.
You can make 178 anagrams from letters in arkoses (aekorss).
Borrowed into English from French around 1830-40
At the base there is often an arkose, composed largely of fragments of serpentine and granite derived from the ancient floor.
The lowest cretaceous rocks yet found are composed of an arkose, derived in large part from the original igneous mass.