{\rtf1\ansi\deff0\deftab360 {\fonttbl {\f0\fswiss\fcharset0 Arial} {\f1\froman\fcharset0 Times New Roman} {\f2\fswiss\fcharset0 Verdana} {\f3\froman\fcharset2 Symbol} } {\colortbl; \red0\green0\blue0; } {\info {\author Biblio 7.x}{\operator }{\title Biblio RTF Export}} \f1\fs24 \paperw11907\paperh16839 \pgncont\pgndec\pgnstarts1\pgnrestart Isachsen, C.E., Bowring, S.A., Landing, E., Samson, S.D., 1994. New Constraint on the Division of Cambrian Time. Geology 22, 496-498. doi:10.1130/0091-7613(1994)?022<0496:NCOTDO>?2.3.CO;2\par \par }