Geology of Grand Canyon Rock Layers

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INTRODUCTION to STRATIGRAPHY

This is an overall introduction to the topic.

Kaibab Formation

KAIBAB FORMATION

Limestone, Sandy Limestone, Sandstone, Chert
270 Million Years Old, 350 Feet Thick

Toroweap Formation

TOROWEAP FORMATION

Sandstone, Sandy Limestone, Shale
275 Million Years Old, 250 Feet Thick

Coconino Sandstone

COCONINO SANDSTONE

Sandstone
280 Million Years, 350 Feet Thick

Hermit Formation

HERMIT FORMATION

Siltstone, Shale, Sandstone
285 Million Years Old, 300 Feet Thick

Supai Group

SUPAI GROUP

Sandstone, Siltstone, Shale, Limestone
300 Million Years Old, 900 Feet Thick

Redwall Limestone

REDWALL LIMESTONE

Limestone, Dolomite, Chert
340 Million Years Old, 450 Feet Thick

Tonto Group

TONTO GROUP

Limestone, Shale, Sandstone
510 Million Years Old, 1025 Feet Thick

Muav Limestone

MUAV LIMESTONE

Limestone, Dolomite, Siltstone
505 Million Years Old, 375 Feet Thick

Bright Angel Shale

BRIGHT ANGEL SHALE

Shale, Sandstone
510 Million Years Old, 325 Feet Thick

Tapeats Sandstone

TAPEATS SANDSTONE

Sandstone
515 Million Years Old, 300 Feet Thick

Vishnu Complex

VISHNU COMPLEX

Schist, Granite, Gneiss
1,700 Million Years Old, Unknown Thickness

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