Nonconformity sedimentary rocks over crystalline metamorphic or igneous

Nonconformity - sedimentary gravels over garnet schist. What is the history of this outcrop?

N. Lindsley-Griffin, 1998 Cross-cutting relationships: dike cutting gneiss is younger

Cross cutting relationships: what is the sequence of events in this folded marble with

Grand Canyon Formations Superposition Disconformity Original horizontality Angular unconformity Cross-cutting relationships Nonconformity © Houghton

Grand Canyon Formations Sequence of events based on geology of the Inner Gorge 1.

Geologic Time - Summary Relative Age -- whether a particular rock or feature is

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Nonconformity - sedimentary rocks over crystalline (metamorphic or igneous) rocks N. Lindsley-Griffin, 1998

Nonconformity - sedimentary gravels over garnet schist. What is the history of this outcrop? N. Lindsley-Griffin, 1998

N. Lindsley-Griffin, 1998 Cross-cutting relationships: dike cutting gneiss is younger

Cross cutting relationships: what is the sequence of events in this folded marble with two dikes? N. Lindsley-Griffin, 1998

Grand Canyon Formations Sequence of events based on geology of the Inner Gorge 1. Deposition of shale in marine environment 4. Erosion to sea level, unconformity surface © Houghton Mifflin 1998. All rights reserved 2. Metamorphism of shale into Vishnu schist 5. Deposition of Grand Canyon Supergroup 6. Faulting 3. Intrusion by Zoroaster granite 7. Erosion of fault blocks, deposition of Tapeats sandstone

Geologic Time - Summary Relative Age -- whether a particular rock or feature is older or younger than another Absolute Age -- the age of a rock in years (m. y. = millions of years) Geologic Column -- shows succession of all known strata, in chronological order, based on fossils and other relative ages N. Lindsley-Griffin, 1999