id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
geusb-5034	Pedersen, Stig A Schack	Palaeogene diatomite deposits in Denmark: geological investigations and applied aspects	2008	4	.pdf	application/pdf	2723	145	59	In addition, the exposed Fur Formation is a unique reference for investigations of the Palaeogene stratigraphy in the North Sea, where mudstones and shales with ash layers are known as the Sele and Balder Formations (Schiøler et al. 2007). Stage 2 is represented by ash layers –21 to –15, which are variable in composition and comprise phonolites, nepheli - nites, trachytes and rhyolites.	cache/geusb-5034.pdf	txt/geusb-5034.txt