McCoy, Sir F., 201 McMahon, C. A., 77 Madsen, H. P., 277 Magnesian Limestone, 209-211 Malm, 226 Maps, geological, 84, 130; use of, 86, 120, 121 Marcou, J., 130, 279 Marine deposits, 102; nature of fossils in, 107 Marl slate, 209, 210 Marlstone, 229 Marsh, O. C., 249 Marwood beds, 183 Matthew, G. F., 160-162, 180 Meadfoot sands, 184 Mechanically formed rocks, 29, 102 Mello, J. M., 270 Mendip system of folds, 203 Menevian beds, 152, 154, 156, 161 Metamorphic rocks, 25 Miall, L. C., 122 Michell, J., 10, 11 Millepore oolite, 230, 231 Miller, H., 189 Millet seed sands, 100 Millstone grit, 192 Miocene period, 252-255 Moffat shales, 169, 177 Mojsisovics, E. von, 224, 227 Morgan, C. Ll., 141 Morte slates, 184 Moscovian beds, 193, 301 Mountain limestone, 192 Murchison, Sir R. I., 19, 20, 174, 179 Murray, Sir J., 30 Muschelkalk, 218, 221, 222 Nehring, A., 267, 268 Neobolus fauna, 160 Neocomian series, 236-238 Neolithic age, 275-277 Neumayr, M., 115, 233 Newton, E. T., 45 Nicholson, H. A., 189, 250 Noachian Deluge, 8 Noetling, F., 160 Nordenskjöld, A. E., 113, 114 Noric beds, 225 Northamptonshire sands, 230 Norwich crag, 256, 257 Nummulitic limestone, 248 Old red sandstone, 183, 185, 186, 188, 191 Oldham, R. D., 208 Oldhaven beds, 244, 245 Olenellus fauna, 134, 153, 156-160 Olenus fauna, 152, 161, 162 Oligocene beds, 251, 252 Oligocene fauna and flora, 252 Oolite, 226 Ordovician faunas, 172, 173 Ordovician system, 164-173 Organically formed rocks, 29, 102, 109 Orogenic movements, 32 Osborne beds, 257 Owen, Sir R., 277 Oxford clay, 232 Oxford oolite, 226 Oxfordian series, 227, 232