Sedimentary Rocks (Extra - Udden-Wentworth Scale, Provenances, Pettijohn and Mudrock Classification Flashcards by Kendrich Fetalvero

Q

Size range for Boulder

A

> 256mm

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Q

Size range for Cobble

A

64-256 mm

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Q

Size range for Pebble

A

4-64 mm

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Q

Size range for Granule

A

2-4 mm

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Q

Size range for Sand

A

0.063-2 mm or 1/16-2 mm

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Q

Size range for Silt

A

0.0039-0.063 mm or 1/256-1/16 mm

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Q

Size range for Clay

A

<1/256 mm

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Q

Phi value for Boulders

A

< -8

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Q

Phi value for Cobbles

A

-4 to -8

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Q

Phi value for Pebbles

A

-2 to -4

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Q

Phi value for Granules

A

-1 to -2

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Q

Phi value for Very coarse sand

A

0 to -1

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Q

Phi value for Coarse sand

A

1 to 0

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Q

Phi value for Medium sand

A

2 to 1

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Q

Phi value for Fine sand

A

3 to 2

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Q

Phi value for Very fine sand

A

4 to 3

Q

Phi value for Coarse silt

A

5 to 4

Q

Phi value for Medium silt

A

6 to 5

Q

Phi value for fine silt

A

7 to 6

Q

Phi value for Very fine silt

A

8 to 7

Q

Phi value for Clay

A

> 8

Q

Common name for Boulder, Cobble, Pebble and Granule

A

Gravel

Q

What rocks are in gravelstones?

A

Conglomerate and Breccia

Q

What rocks are in Sandstones?

A

Sandstone (Arkose, Wacke, Graywacke)

What rocks are in Mudrock?

Siltstone and claystone

Per cent matrix for Arenite in Pettijohn

0-15%

Per cent matrix for Wacke in Pettijohn

15-75%

Per cent matrix for Mudrock in Pettijohn

75-100%

Sand size in Mudrock Classification

>62 μm (micrometer)

Clay size in Mudrock Classification

<4 μm (micrometer)

Silt size in Mudrock Classification

4-62 μm (micrometer)