TY  - JOUR
T1  - Researches in Physical Geology. Second Series
JF  - Philosophical Transactions of the Royal Society of London (1776-1886)
VL  - 130
SP  - 193
EP  - 208
PY  - 1840/01/01/
UR  - http://dx.doi.org/10.1098/rstl.1840.0011
M3  - doi:10.1098/rstl.1840.0011
AU  - Hopkins, W.
ER  -