| 1. | Within the center of Chuar syncline, this upper contact is a disconformity.
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| 2. | Following a disconformity the Silurian black slates are laid down 0.4 km thick.
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| 3. | The contact between the Hatakai Shale and overlying Shinumo Quartzite is a distinct, significant disconformity.
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| 4. | This is expressed by a disconformity that removed successively deeper reservoir beds to the north and west.
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| 5. | Within the Unkar Group, the contact between the Hakatai Shale and overlying Shinumo Sandstone is a distinct disconformity.
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| 6. | This disconformity is sharp and locally truncates cross-bedding and channels exhibited by sandstones in the underlying Hakatai Shale.
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| 7. | The upper contact of the Kaibab Limestone ( Harrisburg Member ) with the overlying Moenkopi Formation is an erosional unconformity and disconformity.
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| 8. | As documented by the dating of detrital zircons, this disconformity is estimated to represent a period of about 75 million years.
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| 9. | The unconformity and disconformity are inferred to represent most of Permian time ( including the Leonardian ) and part of Early Triassic time.
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| 10. | This disconformity is sharp and locally truncates cross-beds, and channel forms, within the sandstones of the underlying Hatakai Shale.
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