TRANSACTIONS OF THE GEOLOGICAL SOCIETY, ESTABLISHED NOVEMBER 13, 1807. VOLUME THE FIFTH. Quod si cui mortalium cordi et curae sit, non tantum inventis haerere, atque iis uti, sed ad ulteriora penetrare; atque non disputando adversarium, sed opere natoram vincere; denique non belle et probabiliter opinari, sed certo et ostensive scire; tales, tanquam veri scientiamm filii, nobis (si videbitur) se adjungant. Novum Organum, Prafatio. HOttDOttt PRINTED AXD SOLD BY WILLIAM PHILLIPS, GEORGE-YARD, LOMBARD-STREET. 1821. OFFICERS AND COUNCIL OF THE GEOLOGICAL SOCIETY, ELECTED FEBRUARY 2, 1821. PRESIDENT. The Right Honourable Earl COMPTON. VICE-PRESIDENTS. Rev. WILLIAM BUCKI AND, F.R.S. Prof. Min. HENRY WARBURTON, Esq. F.R.S. Oxford. WILLIAM HYDE WOLLASTON, M.I>. F.R.S. JOHN MAC CULLOCH, M.D. F.R; & L.S. SECRETARIES. ALEXANDER HENDERSON, M.D. [ Mr. THOMAS WEBSTER. FOREIGN SECRETARY. HENRY HEULAND, Esq. TREASURERS. DANIEL MOORE, Esq. F.R.A. & L.S. | JAMES VINE, Esq. COUNCIL. Hon. HENRY GREY BENNET, M.P. F.R.S. THOMAS CHARLES HARRISON, Esq. WM. BLAKE, Esq. F.R.S. FREDERICK MOYSEY, Esq. JOHN BOSTOCK, M.D. F.R. & L.S. W. H. PEPYS, Esq. F.R.S. HEN. JAMES BROOKE, Esq. F.R. & L.S. THOMAS SMITH, Esq. F.R. & L.S. H. T. COLEBROOKE, Esq. F.R. & L.S. CHARLES STOKES, Esq. F.R.A. & L.S. G. B. GREENOUGH, Esq. F.R. & L.S. JOHN TAYLOR, Esq. KEEPER OF THE MUSEUM AND DRAUGHTSMAN, Mr. THOMAS WEBSTER. TRUSTEES OF THE GEOLOGICAL SOCIETY. GEORGE BELLAS GREENOUGH, Esq. Sir ABRAHAM HUME, Bart. M.P. WILLIAM BABINGTON, M.D. ROBERT FERGUSON, Esq. DAVID RICARDO,Esq. MP. JOHN WISHAW, Esq. SAMUEL WOODS, Esq. ADVERTISEMENT. THE Editors of the Transactions of the Geological Society are directed to make it known to the Public, that the Authors alone are responsible for the facts and opinions contained in their respective papers. Geological Society, Sept. 1, 1821. It is requested that all letters and communications to the Secretaries, and presents to the Society, be addressed to the House of the Geological Society, No. 20, Bedford Street, Covent Garden, London. Transactions of the Geological Society PLATES vol. 5 1821.