___ Rock and Gravel Company (where Fred Flintstone works)

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Possible Answers: Slate.

Last seen on: Daily Celebrity Crossword – 9/25/18 TV Tuesday

Random information on the term “Slate”:

Ashlar is finely dressed (cut, worked) stone, either an individual stone that has been worked until squared or the structure built of it. Ashlar is the finest stone masonry unit, generally cuboid, mentioned by Vitruvius as opus isodomum, or less frequently trapezoidal. Precisely cut “on all faces adjacent to those of other stones”, ashlar is capable of very thin joints between blocks, and the visible face of the stone may be quarry-faced or feature a variety of treatments: tooled, smoothly polished or rendered with another material for decorative effect.[1][2]

One such decorative treatment consists of small grooves achieved by the application of a metal comb. Generally used only on softer stone ashlar, this decoration is known as mason’s drag.[3]

Ashlar is in contrast to rubble masonry, which employs irregularly shaped stones, sometimes minimally worked or selected for similar size, or both. Ashlar is related but distinct from other stone masonry that is finely dressed but not quadrilateral, such as curvilinear and polygonal masonry.[2][4]

Slate on Wikipedia