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after 1 My

English translation: after one million years

23:58 Sep 20, 2016
English language (monolingual) [PRO]
Science - Geology / معادن الطين
English term or phrase: after 1 My
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).
Mokhtar Nabaleh
Egypt
Selected answer:after one million years
Explanation:
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".
Selected response from:

philgoddard
United States
Grading comment
4 KudoZ points were awarded for this answer



SUMMARY OF ALL EXPLANATIONS PROVIDED
3 +7after one million years
philgoddard


  

Answers


45 mins   confidence: Answerer confidence 3/5Answerer confidence 3/5 peer agreement (net): +7
after 1 my
after one million years


Explanation:
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=...
philgoddard
United States
Native speaker of: English
PRO pts in category: 4

Peer comments on this answer (and responses from the answerer)
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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