The Jurassic Rocks Of The Neighbourhood Of Cambridge: Being The Sedgwick Prize Essay For 1886 (cambridge Library Collection - Cambridge)

Cambridgeshire is rich in Jurassic fossils, with ichthyosaurs having been found at Mepal and Barrington since 2000, and ammonites and belemnites occurring near Grafham Water. In the later nineteenth century, Thomas Roberts, an assistant to the Professor of Geology at Cambridge, was involved in close study of the Jurassic rocks of the district. Despite the complexity arising from troublesome local geologic discontinuities, Roberts correlated the paleontological record in the Jurassic rocks of East Anglia with that of other British and European areas. It was this kind of careful and systematic work that provided the foundation for the modern understanding of the Jurassic period and the mass extinctions at the end of the Mesozoic era. Roberts's essay was originally published posthumously in 1892, and is now reissued for a new generation of geologists and fossil-hunters. Cover......Page 1 Frontmatter......Page 6 PREFACE......Page 10 Contents......Page 14 I - LIST OF WORKS ON THE JURASSIC ROCKS OF THE NEIGHBOURHOOD OF CAMBRIDGE......Page 16 II - INTRODUCTION AND HISTORY......Page 19 III - OXFORD CLAY......Page 24 IV - LOWER CALCAREOUS GRIT......Page 34 V - AMPTHILL CLAY......Page 50 VI - THE CORALLIAN ROCKS OF UPWARE......Page 66 VII - KIMERIDGE CLAY......Page 76 VIII - CORRELATION WITH OTHER ENGLISH DEPOSITS......Page 92 IX - CORRELATION WITH THE FOREIGN DEPOSITS......Page 102 INDEX......Page 110 The author of this 1892 essay overcame the challenge of local geologic discontinuities and successfully correlated the paleontological record in the Jurassic rocks of East Anglia with that of other British and European areas. This careful and systematic work supports the modern understanding of the Jurassic period .