rmation. This is so true that it maybe said without
exaggeration that no one can intelligently discuss the questions that
have been raised in regard to the origin and mode of formation of ore
bodies without transversing and studying the great mining belt of our
Western States and Territories.

The observations made by the writer during the past four years confirm
in all essentials the views set forth in the former article in the
_Quarterly_, and while a volume might be written describing the
phenomena exhibited by different mines and mining districts, the array
of facts thus presented would be, for the most part, simply a
re-enforcement of those already given.

The present article, which must necessarily be short, would hardly have
a _raison d'etre_ except that it affords an opportunity for an addition
which should be made to the classes of mineral veins heretofore
recognized in this country, and it seems called for by the recent
publication of theories on the origin of ore deposits which are
incompatible with those hitherto presented and now held by the writer,
and which, if allowed to pass unquestioned, might seem to be
unquestionable.

BEDDED VEINS.

Certain ore deposits which have recently come under my observation
appear to correspond very closely with those that Von Cotta has taken as
types of his class of "bedded veins," and as no similar ones have been
noticed by American writers on ore deposits they have seemed to me
worthy of description.

These are zones or layers of a sedimentary rock, to the bedding of which
they are conformable, impregnated with ore derived from a foreign
source, and formed long subsequent to the deposition of the containing
formation. Such deposits are exemplified by the Walker and Webster, the
Pinon, the Climax, etc., in Parley's Park, and the Green-Eyed Monster,
and the Deer Trail, at Marysvale, Utah. These are all zones in quartzite
which have been traversed by mineral solutions that have by substitution
converted such layers into ore deposits of considerable magnitude and
value.

The ore contained in these bedded veins exhibits some variety of
composition, but where unaffected by atmospheric action consists of
argentiferous galena, iron pyrites carrying gold, or the sulphides of
zinc and copper containing silver or gold or both. The ore of the Walker
and Webster and the Pinon is chiefly lead-carbonate and galena, often
stained with copper-carbonate. That of the Green Eyed Mo