THE 
QUARTERLY JOURNAL 
OF THE 
GEOLOGICAL SOCIETY OF LONDON. 
EDITED BY 
THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY. 
VOLUME THE FOURTH. 
1848. 
PART THE FIRST. 
PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 
LONDON: 
LONGMAN, BROWN, GREEN, AND LONGMANS. 
PARIS :—FRIED. KLINCKSIECK, 11 RUE DE LILLE; BAUDRY, 9 RUE DU COQ, 
PRES LE LOUVRE; LEIPZIG, T. 0. WEIGEL. 
NEW YORK :—WILEY AND PUTNAM, 161 BROADWAY. 
SOLD ALSO AT THE APARTMENTS OF THE SOCIETY. 
MDCCCXLVIII. 
