Lower Peninsula, 1873-1876: Accompanied by a Geological Map

arenaceous black shales blue shales bluffs boring bottom brine Bryozoa calcareous calyces calyx carinated centimeters central centre Chloride CLADOPORA coal composed conical convex corals corniferous limestone County Creek crests Cyathophyllum depth diameter diaphragms dolomite Drummond's Island epithecal Favosites feet in thickness fire-clay formation fossils fovea growth gypsum Hamilton group Helderberg group horizontal Huron inclosed inspector intersected interstices interstitial kettle Lake lamellæ larger lateral pores layers Little Traverse Bay localities longitudinal Lower Peninsula margins masses Michigan miles millimeter Milne-Edwards Niagara group Ohio orifices outcrops Plate plications Point Detour polygonal polyp cells polyparia Port Colborne quarries radial represents River rock beds rows rugæ Saginaw salinometer salt sand rock sandstone seams septal fovea shore side silicified specimen slate species spinules spinulose Spirifer stems strata STREPTELASMA Stromatopora structure surface Syringopora Thunder Bay Thunder Bay River tion transverse diaphragms tube channels tubules vertical vesiculose Waverly group Zaphrentis Zoantharia