Clast SizeClast ShapeClast SortingColorOtherRock NameClayRou…
Clast SizeClast ShapeClast SortingColorOtherRock NameClayRoundedWellAnyLaminated / layered;may contain fossilsShaleSiltRoundedWellAnyBreaks into blocks; fine but visible grains; feels like fine-grained sandpaperSiltstoneSandVariousModerate/poorRed/pink/rust>25% K feldspar with some large clastsArkose (sandstone)SandRoundedWellBanded layersVarious color bands; cross-bedding may be presentBanded sandstoneSandRoundedWellAnyHomogeneous color; color representative of mineral contentSandstonePebbleRoundedPoorAnyRound clasts in fine-grained matrixConglomeratePebbleAngularPoorAnyAngular clasts in fine-grained matrixBrecciaOriginDescriptionRock NameMicrocrystalline calciteMicrocrystalline mass that contains many pores, some large, and/or layeringTravertineHaliteSalty taste; feels greasy; large mass or small pieces of halite crystalsRock saltMicrocrystalline quartzMay have conchoidal fracture and, as with quartz, can scratch glass; various colors, including red (jasper) and black (flint)ChertOriginDescriptionRock NamePlantsDull luster, dark brown or black; fragments of fossilized plants may be visible; very brittleLignite coalLayered; distinctly black with shiny sections;somewhat brittleBituminous coalShellsNumerous fossilized shell fragments; may be parts or whole fossilsShelly limestoneCrinoidsWhole, round and fragments of fossilized crinoids;crinoid stems appear as circles in cross-sectionEncrinal limestoneCoccolithsMicrofossils; white, earthy rock composed ofcoccoliths (made of calcite – CaCO3)Chalk
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