(slates) of which pebbles are included in the sandstones. These may very well be derived from the same source as the green pebbles now occurring abundantly in the drift (see below) & in that case the interesting drift & time would be that the tertiary beds not only increase in coarseness in approaching the Mountains but differ by the introduction of certain altered rocks in the same way as the more modern drift is found to do.

The Section (beds horizontal) examined is in an isolated hill which stands out like an island of Tertiary among the drift which laps it round. It is an outlier of a plateau with very clear edge which runs approximately Northward (with a little easting) & begins on the line about 8. m. W. of the Second Milk R. If this is therefore the very base of the tertiary the drift in the Milk R. valley may be underlain by cretaceous rock.

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