Geological Survey of Illinois. A. H. Worthen, Director
State survey report on Illinois geology, directed by A. H. Worthen with contributions from Henry Bannister, Edward Cox and Henry Engelmann, issued in 1866 for geologists, mining interests and legislators. The lithographed plates arrange Carboniferous fossils dash brachiopod shells, crinoid crowns and calyxes, bryozoan fragments, fish spines and bony plates dash as numbered specimens in fine stipple and line shading against blank paper, usable as isolated cut-out forms or grid-like specimen arrays.
