These sedimentary clays &#151; clays which have been transported and deposited by moving waters &#151;often contain silts and sand that reduce plasticity and may make the clays unsuitable for pottery making.
(clays; have been transported; ) (silts and sand; may make; the clays unsuitable for pottery making) (clays; deposited; by moving waters &#151) (clays which have been transported and deposited by moving waters &#151; contain; silts and sand that reduce plasticity and may make the clays unsuitable for pottery making; T:often) (silts and sand; reduce; plasticity)
clays silts and sand clays clays which have been transported and deposited by moving waters &#151 silts and sand
have been transported may make deposited contain reduce
the clays unsuitable for pottery making
by moving waters &#151
silts and sand that reduce plasticity and may make the clays unsuitable for pottery making T:often
plasticity