Arenites and wackes ("wackies") are types of a rock named for this material.
﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿On the Krumbein phi scale, this material is graded between "negative one" and "positive four." In the USCS system, this material corresponds both to more than 50% passing through a #4 sieve and more than 50% retained on a #200 sieve. Arenites and wackes ("wackies") are types of a rock named for this material. This material is too heavy to be part of the suspended load in air, so it moves by a form of bed load aeolian (ay-OH-lee-an) transport elucidated by Ralph Bagnold and called "saltation." Parabolic, barchan (BAR-kahn), and seif ("safe") structures constituted of this material can be found in ergs. Clastic sedimentary rocks can be classi⎜ed into mudrock, conglomerates, breccias (BREH-chee-uhz), and a type of "stone" made out of, for 10 points, what medium-grained materialÂ—coarser than gravel but ⎜ner than silt or clayÂ—that forms dunes?
﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿﻿On the Krumbein phi scale, this material is graded between "negative one" and "positive four."
sand [accept sandstone]