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## 2$B7n(B8$BF|!JEZ!K(B $B%7%s%/%mN((B 25 % $B$J$+$J$+!#BgJQ$G$"$k!#(B ## 2$B7n(B5$BF|!J?e!K(B $B%7%s%/%mN((B 30 %

$B$J$<(B Chibian $B$d(B Chiban $B$G$O$J$/(B Chibanian $B$J$N$+$K$D$$F!":#2sN?=@Ar9TC?!V@iMU%;%/%7%g%s(BGSSPB?=@A%0%k!<%W!WN(B web B%5%%HK(BB@bL@(BB,"kNrH/8+!#(B International Stratigraphic GuideBNL?L>5,LsK=>$$$^$9$H!$(B
$B!J(BICS$B$N(BHP: http://www.stratigraphy.org/upload/bak/chron.htm$B!K(B

The name of a stage should be derived from a geographic feature in the vicinity of its stratotype or type area.
In English, the adjectival form of the geographic term is used with an ending in "ian" or "an". The age takes the same name as the corresponding stage."
$B0ULu!'(B $B%9%F!<%8L>$OLO<0CO6aK5$NCOM}E*$JFCD'$KM3Mh$9$k$Y$-$G$"$k!%(B $B1Q8l$K$*$$FO!COM}E*MQ8lN7AMF;l7?KBP7F!(B"ian"B^?O(B"an"BrC18lKvKD1k!J0J2 BH"j^9!%(B B3N%k!<%kK=>&H!!V@iMU!WH$$$&COL>$K4p$E$/%9%F!<%8L>$O!I(BChibian$B!J%A%S%"%s!K!I$,:G$b%7%s%W%k$J7A$K$J$j$^$9!%(B
$B$7$+$7!$$3NL>>NOF|K\8lH7F"^jE,@ZHO8@(J$$2;$r4^$_!$CO85$G$"$k!V%A%P!W$N2;$,<:$o$l$F$7$^$$^9!%(B B=3G?=@A%A!<%GO!(B B!H(BChibaB!IN7AMF;l7?G"k!I(BChibanB!IKBP7F!JNc(P!I(BCalifornia"BO!!I(BCalifornian"BKJQ495l^9!K!(B BL?L>5,LsKB'j!I(BianB!IrD1k3HG(B"ChibanianB!IH$$$&L>>N$rCO$H$7$FDs0F$9$k$3$H$K$7$^$7$?!%(B $B$3$NMQK!$K$D$$F!"CONL?L>5,Ls*hS1QJ8K!>eNLdBjO"j^;s!%(B B!VF|K\8lH7F"^jE,@ZHO8@(J$$2;!W$H$$&NOh/J,+iJ$$$,!"!V(BChibi$B!W$,!V%A%S!W$rO"A[$5$;$k$H$$&3H@m&+!#^"=lO$$$$N@,!">e5-NL?L>5,LsN!V0ULu!WCF8mLu8cJ$$$N$+$J$!!#(B"the adjectival form of the geographic term is used with an ending in "ian" or "an"" $B$H$$&NO!V7AMF;l7?KBP7F!(B"ian"B^?O(B"an"BrC18lKvKD1k!WH$$$&0UL#$8$c$J$/$F!"!V(B"ian" $B$^$?$O(B "an" $B$r8lHx$KIU$1$F7AMF;l7A$K$7$?$b$N$r;H$&!W$H$$&0UL#G7g&!#(B-ian BH+(B -an BOL>;lr7AMF;l2=9k?aN@\Hx<-Js@+i!#!V7AMF;l7AK5iK(B -ian/-an BrIU1m!WHLu9NO*+7$$!#(B

$B$G!"7k6I!"(B-ian/-an $B$,$/$C$D$/!V8l44!W$r$I$&:n$k$+$OL?L>5,Ls$K$O=q$+$l$F$$J$$$o$1$@$,!"$3$l$^$G$NNc$J$I$r9M$($l$P!"8lHx$,;R2;!\Jl2;$G=*$o$k>l9g$K$O:G8e$NJl2;$r:o=|$7$F(B -ian/-an $B$rIU$1$k$N$,IaDL$J$N$G!"$d$C$Q$j(B "Chibian" $B$+(B "Chiban" $B$7$+$J$$O:!#J<(B "Chiban" BGO%@%aJN+KD$$$F$O0J2<$N@bL@$,B3$/!#(B

$B0lJ}!$!H(BChibian$B!I0J30$NA*Br;h$H$7$F(B Chiba + an$B$NAH$_9g$o$;$+$i!$!I(BChiban$B!I(B $B$^$?$O!$!I(BChibaan$B!I$J$I$N8uJd$rDs0F$5$l$k$3$H$,$"$j$^$9!%(B

## 2$B7n(B2$BF|!JF|!K(B $B%7%s%/%mN((B 26 % 20200202$B!#N$K$J$k$N$OMhG/(B12$B7n(B2$BF|$+!#(B

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