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In trying to clarify what is meant by 'gradational' in the 'Structure and stratigraphy' section, I came across these two sources that look useful [1] & [2]. Mikenorton ( talk) 10:25, 29 July 2012 (UTC) reply

From Wikipedia, the free encyclopedia

More sources

In trying to clarify what is meant by 'gradational' in the 'Structure and stratigraphy' section, I came across these two sources that look useful [1] & [2]. Mikenorton ( talk) 10:25, 29 July 2012 (UTC) reply


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