On cobordism of generalized (real) Bott manifolds

We show that all generalized (real) Bott manifolds which are (small covers) quasitoric manifolds over a product of simplices ${\mathrm{\Delta }}^{n_1}\times \cdots \times {\mathrm{\Delta }}^{n_r}\times {\mathrm{\Delta }}^1$ are always boundaries of some manifolds. But these manifolds with the natural $({\mathbb{Z}}_2{)}^n$ action do not necessarily bound equvariantly. In addition, we can construct some examples of null-cobordant but not orientedly null-cobordant manifolds among quasitoric manifolds.