East wall of Peach Springs Canyon about 14.2 mi. N. of Peach Springs
Temporal Coverage
Older Precambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Vishnu Schist
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/14
Both thin section images were taken at a 400x magnification. ]]>2017-06-01T08:18:30-07:00
Title
Brahma Schist
Alternative Title
Schist
Identifier
GC-2
Description
Part of the The Granite Gorge Metamorphic Suite, this is usually considered a metavolcanic, and its mineralogy is dominated by quartz and mica.
Both thin section images were taken at a 400x magnification.
This sample is mis-labeled as a pegmatite. It is really a porphyritic dike material that cuts through the Zoroaster Granite. The phenocrysts are hornblende.
]]>https://geosciencecollections.milne-library.org/items/show/16
Both thin section images were taken at a 400x magnification.]]>2017-06-01T08:09:13-07:00
Title
Tapeats Sandstone
Alternative Title
Sandstone (orthoquartzite)
Identifier
GC-4
Description
Sandstone shows metamorphic overprinting with triple junctions between quartz grains common.
Both thin section images were taken at a 400x magnification.
East wall of Peach Springs Canyon about 13 mi. N. of Peach Springs
Temporal Coverage
Early to Middle Cambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Tapeats Sandstone
Number of Thin Sections
2
]]>https://geosciencecollections.milne-library.org/items/show/17
Both thin section images were taken at a 400x magnification.]]>2017-06-01T08:06:31-07:00
Title
Muav Limestone
Alternative Title
Limestone
Identifier
GC-5
Description
Mottled lithology of the Muav Limestone.
Both thin section images were taken at a 400x magnification.
West wall of Peach Springs Canyon about 12 mi. N. of Peach Springs
Temporal Coverage
Middle Cambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Muav Limestone
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/18
Both thin section images were taken at a 400x magnification.]]>2017-06-01T08:04:50-07:00
Title
Bright Angel Shale
Alternative Title
Shale
Identifier
GC-6
Description
Green clay lithology of the Bright Angel Shale.
Both thin section images were taken at a 400x magnification.
Roadcut in Peach Springs Canyon 10 mi. N. of Peach Springs
Temporal Coverage
Middle Cambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Bright Angel Shale
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/19
Both thin section images were taken at a 400x magnification.]]>2017-06-01T08:02:56-07:00
Title
Bright Angel Shale
Alternative Title
Siltstone
Identifier
GC-7
Description
Red siltstone lithology of the Bright Angel Shale.
Both thin section images were taken at a 400x magnification.
Roadcut in Peach Springs Canyon 10 mi. N. of Peach Springs
Temporal Coverage
Middle Cambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Bright Angel Shale
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/20
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:55:12-07:00
Title
Muav Limestone
Alternative Title
Limestone
Identifier
GC-8
Description
Limestone containing fossils of the alga, Girvanella.
Both thin section images were taken at a 400x magnification.
East wall of Peach Springs Canyon about 7.5 mi. N. of Peach Springs
Temporal Coverage
Middle Cambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Muav Limestone
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/21
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:52:29-07:00
Title
Bright Angel Shale
Alternative Title
Shale
Identifier
GC-9
Description
A silty-shale where the clasts are dominated by quartz. Sample collected from an area typified by interbedded limestones and shale.
Both thin section images were taken at a 400x magnification.
East wall of Peach Springs Canyon about 7.0 mi. N. of Peach Springs
Temporal Coverage
Middle Cambrian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Bright Angel Shale
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/22
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:51:42-07:00
Title
Redwall Limestone (Oblitic and Crinoidal Lithology)
Alternative Title
Limestone
Identifier
GC-10
Description
Oblitic and Crinoidal Lithology.
Both thin section images were taken at a 400x magnification.
S. side of roadcut on US 66, 4.5 mi. E. of Peach Springs, Arizona
Temporal Coverage
Mississippian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Redwall Limestone
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/23
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:50:45-07:00
Title
Redwall Limestone (green conglomerate lithology)
Alternative Title
Limestone
Identifier
GC-11
Description
Fine-grained limestone with occasional fossil remains.
Both thin section images were taken at a 400x magnification.
S. side of roadcut 13 mi, E. of Peach Springs, Coconino Co., Ariz
Temporal Coverage
Mississippian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Redwall Limestone
Number of Thin Sections
2
]]>https://geosciencecollections.milne-library.org/items/show/24
Modal Abundances:
Quartz (95%)
Matrix (5%)
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:49:47-07:00
Title
Chert
Alternative Title
Slightly metamorphosed sandstone
Identifier
GC-12
Description
Collected from the Redwall Formation, this is a highly silicious sample defined in the suite's documentation as chert, but the sample lacks the nano-crystalline appearance of a traditional chert. It appears to be more of a slightly metamorphosed quartzose sandstone.
Modal Abundances:
Quartz (95%)
Matrix (5%)
Both thin section images were taken at a 400x magnification.
S. side of roadcut 13 mi, E. of Peach Springs, Coconino Co., Ariz.
Temporal Coverage
Mississippian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Redwall Limestone
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/25
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:48:23-07:00
Title
Redwall Limestone (Conglomerate)
Alternative Title
Conglomerate
Identifier
GC-13
Description
Though listed as a limestone, this sample is best described as a conglomerate with calcite present in the matrix. This sample was collected from a bed of conglomerate lithology just below contact with Supai formation.
Both thin section images were taken at a 400x magnification.
Base of roadcut on US 66, S. end of Aubrey Cliffs, 4.0 mi. W. of Seligman, Ysvupai Co., Arizona.
Temporal Coverage
Mississippian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Redwall Limestone
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/26
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:47:34-07:00
Title
Supai Sandstone
Alternative Title
Sandstone
Identifier
GC-14
Description
A classic red-bed sample typical of the sandstones from the Supai Formation.
Both thin section images were taken at a 400x magnification.
Base of roadcut on US 66, S. end of Aubrey Cliffs, 4 mi, W. of Seligman, Ysvupai Co., Arizona.
Temporal Coverage
Pensylvanian - Permian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Supai Formation
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/27
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:46:23-07:00
Title
Supai Shale
Alternative Title
Silty- Shale
Identifier
GC-15
Description
Classic red-bed sample from the Supai Formation with silt-sized grains of mostly quartz. Some grains are semi-rounded.
Both thin section images were taken at a 400x magnification.
Base of roadcut on US 66, S. end of Aubrey Cliffs, 4 mi, W. of Seligman, Ysvupai Co., Arizona.
Temporal Coverage
Permian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Supai Formation
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/28
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:44:29-07:00
Title
Hermit Shale
Alternative Title
Shale
Identifier
GC-16
Description
A ferruginous sample.
Both thin section images were taken at a 400x magnification.
Prominent bluff near US 66 at S. end of Aubrey Cliffs, see specimen 14 locality.
Temporal Coverage
Permian
Accrual Method
Purchased from Western Minerals Inc.
Unit
Coconino Sandstone
Number of Thin Sections
1
]]>https://geosciencecollections.milne-library.org/items/show/30
Both thin section images were taken at a 400x magnification.]]>2017-06-01T07:43:23-07:00
Title
Toroweap Limestone
Alternative Title
Shaley Limestone
Identifier
GC-18
Description
A sample from the gamma member of the Toroweap Formation. It is an orangish-brown sample.
Both thin section images were taken at a 400x magnification.