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please can some one ID and date this small star shape ,,i think it maybe a part of a stem of plant.
This is a columnal from a crinoid - one of the segments comprising the stem.
In general, crinoid columns have a range of shapes, including pentagonal as well as round - see this image
[ from http://www.kgs.ku.edu/Extension/fossils/crinoid.html ]
This page shows columnals almost exactly like yours