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Author Topic:   Exploring the Grand Canyon, from the bottom up.
bluescat48
Member (Idle past 2448 days)
Posts: 2347
From: United States
Joined: 10-06-2007


Message 217 of 283 (436796)
11-27-2007 4:18 PM
Reply to: Message 215 by Jazzns
11-27-2007 3:40 PM


Re: Read it and Nankoweap
from Wikipedia:

φ scale

Size range(metric) Size range(approx. inches) Aggregate name
(Wentworth Class) Other names
< −8 > 256 mm > 10.1 in Boulder
−6 to −8 64–256 mm 2.5–10.1 in Cobble
−5 to −6 32–64 mm 1.26–2.5 in Very coarse gravel Pebble
−4 to −5 16–32 mm 0.63–1.26 in Coarse gravel Pebble
−3 to −4 8–16 mm 0.31–0.63 in Medium gravel Pebble
−2 to −3 4–8 mm 0.157–0.31 in Fine gravel Pebble
−1 to −2 2–4 mm 0.079–0.157 in Very fine gravel Granule
0 to −1 1–2 mm 0.039–0.079 in Very coarse sand
1 to 0 ½–1 mm 0.020–0.039 in Coarse sand
2 to 1 ¼–½ mm 0.010–0.020 in Medium sand
3 to 2 125–250 µm 0.0049–0.010 in Fine sand
4 to 3 62.5–125 µm 0.0025–0.0049 in Very fine sand
8 to 4 3.90625–62.5 µm 0.00015–0.0025 in Silt Mud
> 8 < 3.90625 µm < 0.00015 in Clay Mud
>10 < 1 µm < 0.000039 in Colloid Mud

Clastic sedimentary rocks, such as breccia or sandstone, were formed from rocks that have been broken down into fragments by weathering, which then have been transported and deposited elsewhere.

Clastic sedimentary rocks may be regarded as falling along a scale of grain size, with shale being the finest with particles less than 0.004 mm, siltstone being a little bigger with particles between 0.004 to 0.06 mm, and sandstone being coarser still with grains 0.06 to 2 mm, and conglomerates and breccias being the coarsest with grains 2 to 256 mm. Breccia has sharper particles, while conglomerate is catergorized by its rounded particles. Arenite is a general term for sedimentary rock with sand-sized particles.

It appears that mudstone can be the same as siltstone & shale just different mineral content


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Replies to this message:
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bluescat48
Member (Idle past 2448 days)
Posts: 2347
From: United States
Joined: 10-06-2007


Message 224 of 283 (437019)
11-28-2007 2:24 PM
Reply to: Message 223 by JB1740
11-28-2007 2:08 PM


Re: Read it and Nankoweap
I was referring to the size of the aggregate

This message is a reply to:
 Message 223 by JB1740, posted 11-28-2007 2:08 PM JB1740 has responded

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bluescat48
Member (Idle past 2448 days)
Posts: 2347
From: United States
Joined: 10-06-2007


Message 233 of 283 (437259)
11-29-2007 12:43 PM
Reply to: Message 232 by jar
11-29-2007 12:30 PM


Re: Now onward and upward.
From what I have seen in studying the past 50+ years, yes.


There is no better love between 2 people than mutual respect for each other

This message is a reply to:
 Message 232 by jar, posted 11-29-2007 12:30 PM jar has responded

Replies to this message:
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