INDEX.
471
page | |
Plastic clay, Mr. Buckland on the beds of | 277 |
────────, account of the beds of near Reading | 282 |
────────, ────────────── near London | 284 |
────────, ────────────── on the coast of Sussex | 294 |
──────────────── their connexion with those of France | 298 |
Plumsted, account of the Plastic Clay beds near | 290 |
Plymouth, Mr. Hannah's observations on the limestone of | 410 |
Porphyritic veins, of St. Agnes. Rev. J. J. Conybeare on | 401 |
─────────────── probably contemporaneous with the schistose rocks which they traverse | 402 |
─────────────── appearance of the schist in contact with them | 403 |
Porphyry of the Cheviot hills described | 93 |
─────── veins of, traversing the schist and granite of Cruachan | 121 |
──────────────── generally appear perpendicular | 121 |
──────── of Cruachan, its varieties described | 122 |
─────────────── shews a regular series of transition from porphyry to trap | 123 |
Potter's clay, found immediately below the soil over the coal measures | 16 |
Quartz, beds of, interstratified with the marble limestone of Sky | 167 |
────── Mr Phillips on the primitive crystal of | 233 |
────────────── on the cleavage of | 247 |
Quartz rock and schist series of Sky, described | 161 |
──────────────── alternates repeatedly with red sandstone | 162 |
────────, Dr. Mac Culloch's supplementary observations on | 264 |
────────, circumstances to prove that its origin is partly mechanical | 268 |
────────, avanturine a variety of | 272 |
────────, particulars of its occurrence in Sky | 273 |
────────, alternations of, with red sandstone and greywacke schist | 274 |
Quicksands, covering the coal measures | 30 |
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