Collection of rocks, and shells

A collection of rocks and shells
basalt, conglomerate, granite, limestone, marble, obsidian, quartzite, rhyolite, sandstone, schist, shale
cockle, coquina, crown conch, limpet, olive, sand dollar, tectarius
Two booklets - Things of Science, Mollusk Unit No. 195 and Things of Science, Petrology Unit No. 204
Collection includes other numerous rocks & minerals given by R. B. Coyle of Athol.

Approximate era: 
don't know