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39
Argillite is black - no blue shade at all. Sometimes a little rusty.
I have not the least hesitancy in retaining the former among the Tully Group.
The truth is, the Calcareous matter began to fail, towards the last of the Tully Epoch, while the Argillaceous element continued in full force.
In several thin seams, it was in excess, during the solilidification, or rather precipitation of the Calcareous element.
The introduction of the Calcareous [[strikethrough]] epock [[/strikethrough]] epoch above the Hamilton was comparatively sudden. Not more than six inches of Argillaceous Limestone

Transcription Notes:
'solilidification' is transcribed as seen