Talk:Folk classification

Removed "alternatives"

I removed the following from the section on Folk Sandstone Classification: "The primary alternative to the Folk classification scheme for sandstone classification uses the Gazzi-Dickinson method and QFL diagrams. The main difference is the classification of fine-grained components within sandstones. Sand-sized parts of rock fragments are considered separately in the Gazzi-Dickinson method, whereas they are always rock fragments in the Folk scheme. For example, consider a sand rich in grus, or a granitic sand. Point counting with these two methods would have drastically different results. A Folk-style count would be rich in rock fragments, when a Gazzi-Dickinson point count would show the sand rich in quartz and feldspar."

There are tens of alternatives and the Gazzi-Dickinson method is merely one of them. The paragraph does not go well in that section nor in any other part of the article. It is way too long and, in my opinion, adds nothing to the article. Maybe we can put the Gazzi-Dickinson method under a "Related Articles" section. Hamsterlopithecus (talk) 04:45, 6 April 2011 (UTC)

QFR Diagram Has Wrong Scale

I think the 75 is in the wrong place on the QFR diagram. I have just checked the original Folk publication, and Folk has it in the wrong place! The 75 should be 3/4 of the way up the axis, not half way! Wikipiper (talk) 08:49, 27 December 2012 (UTC)

It seems to be fairly common to use only the top half of the QFR diagram (e.g. [1]), presumably as most sandstones plot in the quartz-rich part - the addition of a 50 at the base would be helpful I think. Mikenorton (talk) 12:19, 27 December 2012 (UTC)

As in the original publication, the scale along the sides of the main triangle is NOT linear (i.e. the 50% mark is not halfway up). That is why it is the only triangle with labeled scales. This seems pretty straight-forward and I would hate to have it any different than the way Folk published it. We could put a note on the description if you think it's necessary. Thoughts? Hamsterlopithecus (talk) 10:43, 28 December 2012 (UTC)

That makes sense - I originally thought non-linear until I found examples of partial QFR diagrams. A note somewhere in the text explaining that would be helpful in my view. Mikenorton (talk) 11:59, 28 December 2012 (UTC)

External links modified (January 2018)

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