Authigenic silicate formation from volcanic ash in the Kinnekulle bed (Ordovician, Baltic region)Kiipli, Tarmo; Hints, Olle; Kallaste, Toivo; Kiipli, EnliEuroclay 1999 : Conference of the European Clay Association : Sept. 5.-9.1999, Krakow, Poland : abstracts1999 / p. 100