id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
gc-228	Tucker, Maurice E.	Mixed Clastic–Carbonate Cycles and Sequences: Quaternary of Egypt and Carboniferous of England	2010	20	.pdf	application/pdf	7968	410	58	Lower mudrock – upper carbonate cycles In metre-scale (4th/5th order) carbonate cycles (para- sequences) with lower mudrock beds, the clays are usually deeper-water marine or lagoonal facies, derived from reworking of muddy coastal plains and supplied by rivers. Wide expanses of carbonate sand, mostly of calcareous algal origin, occur on the shelf off NE Brazil, where quartz- rich sands were deposited at times of glacially-lowered sea-level (TESTA & BOSENCE, 1998).	cache/gc-228.pdf	txt/gc-228.txt