7-B. _Prasopora_, Bryozoan, Ordovician. Side view. (X0.5)
7-C. _Prasopora_, Bryozoan, Ordovician. Vertical thin section showing
the nature and growth of part of a bryozoan colony. (X18)
The Geology of D.A.R. State Park, Mt. Philo State Forest Park, Sand Bar State Park · 第 9 / 22 题