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					Originally Posted by R.R.J Tolkien  So than much of the published sil comes from Tolkiens later writings post 1937? | 
	
 There are good chunks that date back before 1937--and, certainly, the overall structure of the "Quenta Silmarillion" is basically the 1937 text, but Tolkien expanded quite a bit (especially from before "the Great Tales") after writing 
The Lord of the Rings.
Actually, most of what 
Morgoth's Ring and 
The War of the Jewels are about, where they deal directly with Silmarillion texts, is showing what parts of the Silm are pre-1937 and what are post-LotR, because Tolkien didn't start over after the LotR--he took his pre-1937 drafts and expanded on them--directly on them, in some cases.