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to occur in Jurassic, Lower Cretaceous or Skeena, and Tertiary

rocks. In the Jurassic rocks the know deposits occur in tiny
seams and as carbonaceous shale, which are not likely to have
commercial value. The Tertiary coals are lignitic and have not
yet been demonstrated to have commercial value. They are also
probably of very small extent. All of the coal so fer indicated
to be commercial or likely to be commercial is confined to rocks
either identified as Skeena or correlated with these.

The Skeena rocks do not carry coal in all localities;
they show wide variations in this respect from basin to basin
and even within short distances in one basin. Most of the coal,
however, is confined mainly to the lower part of the series. The
characteristics exhibited suggest that the coal-bearing rocks
were not laid down continuously over the whole area, but undoubt-
edly they were much more extensive than now.

The coal has been greatly affected by the intrusion
of the granitic bodies both in regard to quality and structure.

It shows a complete range from normal bituminous coal to

anthracite and even graphite. The coal-bearing strata have been

upbowed, deformed, and faulted near and over the areas of

intrusion. They now occur mainly in topographical basins in the
form of structural basins--that is, in the central part of these
areas the beds are flat and around the edges they are turned up
and in places extend up the slopes of the mountains in relatively
thin shells.

In the larger valleys and low areas the coal-bearing
strata are little deformed and faulted and are.soft, and quite
different from the older rocks. As a consequence they have been
more readily eroded and now are extensively obscured by drift.

In narrow valleys the coal measures are more steeply folded and

more faulted and the coal is more altered. Where the coal