Great Unconformity Mega-Escarpment Simulator

Precambrian Tectonic Cliff & Missing Rock Record Model

1.0 Ga Mega-Escarpment Phase

Deep Time: 1.0 Ga

Escarpment Fault Uplift: 1000 m

Fault Dip Angle: 60°

Subaerial Weathering Intensity: 85%

Tectonic Hypothesis:

Unconformity Missing Gap: 1100 Myr

Exposed Basement Lift: 1.0 km

Retained Supergroup Wedge: 420 m

Visible Contact: Tapeats on Vishnu

Tapeats Sandstone

Unkar/Chuar Strata

Vishnu Schist

Zoroaster Granite

Stage 3 (1.0–0.7 Ga): Precambrian Mega-Escarpment & Weathering. A 1-km-high normal fault escarpment uplifted the western crustal block, exposing ancient 1.8 Ga Vishnu metamorphic basement to subaerial erosion nearly 1 billion years before the Colorado River began carving.

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