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leather sleeve
anticipation of
Sep 20, 2016 23:58
7 yrs ago
English term

after 1 My

English Science Geology معادن الطين
To a certain extent, I think there's a typo, I wonder what is it?

The source of my text:

https://books.google.com.eg/books?i­d=YKkw-Bre-kAC&pg=PA219&lpg=PA219&d­q=%22HI+minerals,+after+1+My%22&sou­rce=bl&ots=69ms80AHT8&sig=L3RBvuL2d­5--maBL2PikM4PIlFA&hl=ar&sa=X&ved=0­ahUKEwjx4KmBiJ_PAhWCURoKHc-lDOQQ6AE­IGjAA#v=onepage&q=%22HI%20minerals%­2C%20after%201%20My%22&f=false

Context:
Old soils show high kaolinite and often gibbsite in the C horizons.

In soils of the Coastal Southeastern United States one finds a loss of A horizon 2:1 minerals, essentially HI minerals, after 1 My, where the soils of older age show, rather abruptly, a loss of significant amounts of 2:1 minerals, a change which was accompanied by a change in bulk composition of the soils (Howard et al., 1993).
Responses
3 +7 after one million years
Votes to reclassify question as PRO/non-PRO:

Non-PRO (1): Edith Kelly

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Responses

+7
45 mins
Selected

after one million years

Geology often uses Ma to represent million years, but on page 57 of my reference they appear to be using "ky" for "thousand years" and "my" for "million years".
Reference:

http://books.google.co.uk/books?id=rMWJNJ4pfKUC&pg=PA57&lpg=PA57&dq=horizon+minerals+2:1+%221+My%22&source=bl&ots=eTDytmojoa&sig=tdaw2vXVjNs

Peer comment(s):
agree Jörgen Slet : I've seen My used quite a bit. Ma I haven't seen:)
30 mins
agree Daryo : yes, and for geology, it's about as long as a blip ...
2 hrs
agree Edith Kelly
3 hrs
agree Yasutomo Kanazawa
3 hrs
agree Tony M : Capital M = mega = million
4 hrs
agree Charles Davis : Geologists use both: Ma = a million years ago (age) and Myr or My = a period of a million years (duration), but there is a controversial proposal to use Ma for both (adding "ago" for age). Anyway, Ma and My are different, and this is duration, as you say
5 hrs
agree Yvonne Gallagher
8 hrs
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4 KudoZ points awarded for this answer.
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