Transcriber's Note: Every effort has been made to replicate this text as faithfully as possible. Italic text has been marked with _underscores_. Superscript letters are preceded by ^. OE ligatures have been expanded. The Geologists' Association. ON THE RED CHALK OF ENGLAND. BY THE REV. THOS. WILTSHIRE, M.A. F.G.S. PRESIDENT OF THE GEOLOGISTS' ASSOCIATION. A PAPER READ AT THE GENERAL MEETING, 4TH APRIL, 1859. LONDON: PRINTED FOR THE ASSOCIATION, AND PUBLISHED AT THE OFFICE OF "THE GEOLOGIST," 154, STRAND. 1859. LIST OF PLATES. PLATE I. Fig. 1. Inoceramus Coquandianus, from Speeton. 2. Fragment of Inoceramus, striated by glacial action, Muswell Hill. 3. Nautilus simplex, Hunstanton. 4. Inoceramus Crispii, Hunstanton. 5. I. tenuis, Hunstanton. PLATE II. 1. Spongia paradoxica, Hunstanton. 2. Siphonia pyriformis, Hunstanton. 3. Cardiaster suborbicularis, Hunstanton. 4. Ostrea frons, Muswell Hill. 5. O. vesicularis, Hunstanton. 6. Exogyra haliotoidea, Hunstanton. 7. Cytherella ovata, Speeton. 8. Cristellaria rotulata, Speeton. 9. Trochocyathus (?) ----, Hunstanton. PLATE III. 1, 1_a._ Vermicularia elongata. Upper and under surface of two different specimens, Speeton. 2. Vermicularia umbonata, Hunstanton. 3. Serpula irregularis, Hunstanton. 4. S. antiquata, Hunstanton. 5. Bourgueticrinus rugosus, Hunstanton. 6. Diadema tumidum, Hunstanton. 7. Cidaris Gaultina (?), Hunstanton. PLATE IV. 1. Terebratula biplicata, 1_a._ mag. surface, Hunstanton. 2. T. semiglobosa, 2_a._ mag. surface, Speeton. 3. Kingena lima, 3_a._ mag. surface, Hunstanton. 4. Terebratula capillata, 4_a._ mag. surface, Hunstanton. 5. Belemnites attenuatus, Hunstanton. 6. B. Listeri, Speeton. 7. B. ultimus, Speeton. 8. B. minimus, Speeton. ON THE RED CHALK OF ENGLAND A Paper read 4th April, by Rev. THOMAS WILTSHIRE, M.A., F.G.S., Etc., President. Persons in general take as the type or representative of chalk the material which mechanics employ for tracing out rough lines and figures. It is a substance of a bright white colour, somewhat yielding to the touch, and capable of being very easily abraded or rubbed down. But the geologist gives a much wider interpretation to the term, not limiting it by these few characteristics; and, accordingly, he includes under the same title many strata which would hardly be so grouped together by the uninitiated.