Proceedings of the American Association for the Advancement of ScienceAmerican Association for the Advancement of Science, 1851 |
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A. D. BACHE AGASSIZ Albany appear Association Azoic beds belong Black Slate Boston Brachiopoda calcareous Cambridge Caradoc Carboniferous Chagrin Falls character Charleston Chas Cincinnati Cliff Limestone coal Coast Survey color conglomerate coral crinoidea crinoids deposits Devonian direction distance drift elevation epoch examination formation fossiliferous fossils genera genus geologists gneiss Goniatites granite grit Haven Henry hundred feet igneous rocks inches Iowa iron John Keweenaw Lake Superior latitude Lingula lower Silurian magnesian limestone Mass meeting miles Mississippi Missouri Mitchel mountain nearly observations Observatory occur Ohio Paleozoic Philadelphia portion Potsdam Potsdam sandstone present probably Prof reef region remarked ring river sand schists sedimentary seen shale shells shore species specimens Standing Committee star strata surface Synapta tentacles thickness tion trap trappean rocks trilobite unconformably upper valley Washington western York zenith