It contains a good deal of micaceous sand. The trunks and
branches of trees, in the form of lignite, are found in it in
great quantities, and frequently associated with sulphuret and
sulphate of iron. Irregular streaks of green marl are also
found in it ; in some places enough to make it valuable as a
manure. Characteristic fossils are also found. The examina-
tions made thus tar have not been sufficient to furnish precise

* descriptions of the position or qualities of the difierent layers
or even of the beds of this stratum.
