  B.-Y. Chen initiated the study of warped product submanifolds in his
fundamental seminal papers \cite{C1,C2,C2.1}. In this paper, we study contact
CR-warped product submanifolds of cosymplectic space forms and prove an optimal
inequality by using Gauss and Codazzi equations. In addition, we obtain two
geometric inequalities for contact CR-warped product submanifolds with a
compact invariant factor.
