Prismatic
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In geology and petrology, prismatic, or sometimes just called "prism", refers to a usually long, narrow, wedge-shaped sedimentary body with a width to thickness ratio greater than 5 to 1 but less than 50 to 1, and a length 1.5 to 3 times its width.
These types of sediments are typically formed during orogenic deformation. For example, the arkoses found in fault troughs.
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