Geology of Grand Canyon Rock Layers

	INTRODUCTION to STRATIGRAPHY This is an overall introduction to the topic.
	KAIBAB FORMATION Limestone, Sandy Limestone, Sandstone, Chert 270 Million Years Old, 350 Feet Thick
	TOROWEAP FORMATION Sandstone, Sandy Limestone, Shale 275 Million Years Old, 250 Feet Thick
	COCONINO SANDSTONE Sandstone 280 Million Years, 350 Feet Thick
	HERMIT FORMATION Siltstone, Shale, Sandstone 285 Million Years Old, 300 Feet Thick
	SUPAI GROUP Sandstone, Siltstone, Shale, Limestone 300 Million Years Old, 900 Feet Thick
	REDWALL LIMESTONE Limestone, Dolomite, Chert 340 Million Years Old, 450 Feet Thick
	TONTO GROUP Limestone, Shale, Sandstone 510 Million Years Old, 1025 Feet Thick
	MUAV LIMESTONE Limestone, Dolomite, Siltstone 505 Million Years Old, 375 Feet Thick
	BRIGHT ANGEL SHALE Shale, Sandstone 510 Million Years Old, 325 Feet Thick
	TAPEATS SANDSTONE Sandstone 515 Million Years Old, 300 Feet Thick
	VISHNU COMPLEX Schist, Granite, Gneiss 1,700 Million Years Old, Unknown Thickness