Aragonite Threshold
PCI C 1 O i S i D 1 C
i p i ti j i c i T~n
High —Mq Calcite and Araqoniłe
Calcite: Mg content
generally Iow
g, I pTtTji C I
300 200 1 OO
PREC
O
<3 0 0
500
-*oo