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THE
QUARTERLY JOURNAL
OF THE
GEOLOGICAL SOCIETY OF LONDON.
EDITED BY
THE ASSISTANT-SECRETARY OF THE GEOLOGICAL SOCIETY.
Quod si cui mortalium cordi et curæ sit non tantum inventis hærere, atque iis uti, sed ad ulteriora penetrare;
atque non disputando adversarium, sed opere naturam vincere; denique non belle et probabiliter opinari,
sed certo et ostensive scire; tales, tanquam veri scientiarum filii, nobis (si videbitur) se adjungant.
—Novum Organum, Præfatio.
VOLUME THE TWENTY-SEVENTH.
1871.
PART THE FIRST.
PROCEEDINGS OF THE GEOLOGICAL SOCIETY
LONDON:
LONGMANS, GREEN, READER, AND DYER.
PARIS: FRIED. KLINCKSIECK, 11 RUE DE LILLE; F. SAVY, 24 RUE HAUTEFEUILLE.
LEIPZIG: T. O. WEIGEL.
SOLD ALSO AT THE APARTMENTS OF THE SOCIETY.
MDCCCLXXI.
